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Electrostatics Flashcards

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9492915997electrostaticsthe science dealing with static electric charge0
9492924665chargea special state of the body in which it is able to take part in electric interactions1
9492934022positive chargethe charge of a glass rod rubbed with silk2
9492936017negative chargethe charge which is attracted by the positive one3
9492954555basic electric phenomena-attraction -repulsion -influence -charging up -neutralization -grouding4
9492964534attractionunlike charges attract eachother5
9492966804repulsionlike charges repell eachother6
9492968775influencepositive and negative charges separate inside an originally neutral body as the effect of a charged body7
9492978103groundingwhen connectin an electrically charged body and the Earth with a conductor the charge flows to the Earth8
9492987958neutralizationseperated positive and negative chrages equlize eachother inside a body or a system9
9492993065neutral bodythe body has no charge OR it has both positive and negative charges of the same quantity10
9493000080electric conductormaterial in which charge flows freely11
9493005796electric insulatormaterial in which charge does not flow freely12
9493009667electrolytea substance producing an electrically conducting solution when dissolved in a polar solvent such as water13
9493024007electroscopea device for detecting the presence and determining the sign of electric charges by means of attraction and repulsion14
9493034676plazm statea state of matter in which ions and electrons move freely (electrolized gas)15
9493040617source bodya body which generates an electric field16
9493044707test bodya body used to investigate an electric field17
9493049422electrically closed systemcharge can not enter or leave the system18
9493051878electric forcea type a force exerted by a charged body on its surroundings19
9493071108Coulomb's lawthe electric force depends on the 2 charges and the distance between them20
9493084431principle of the conservation of electric chargein an electrically closed system the totl amount of charge is constant in time21
9493090093electric fielda special region of space in which electric effects can be observed22
9493097344homogeneous electric fieldthe field lines are parallel and the density of them is constant23
9493103465inhomogeneous fieldthe field lines aren't parallel and their density is not constant (e.g.: radial structure of a pointlike source body)24
9493109673electric field strengthit gives the value of the electric force on a unit positively craged test body25
9493120012the vector of electric field stregtha vector which has always the same direction as that of the electric force exerting on a positively charged test body26
9493128339electric field linesimaginery curves indicating the direction of the electric field strengt vectors. at any point of the field line the direction of the electric field vector is always tangential27
9493142739properties of electric field lines-field lines always start from a positively charged source body -field lines always terminate at a negatively charged source body -field lines never intersect eachother28
9493154115electric fluxthe number of field lines intersecting a unit imaginary surface parallelly (in rality there are infinite number of field linesí)29
9493169982linear density of electric chargethe electric charge of a unit length30
9493173528surface density of electric chargethe electric charge of a unit surface31
9493175587shieldingthere is no electric charge inside a conductor32
9493178972stable equilibrium positionwhen removing the body from its equilibrium position it will return after the force exerting on it ceases33
9493190414unstable equilibrium positionwhen removing the body from its equilibrium position it will not return after the force exerting on it ceases34
9493199192work done by an electric fieldthe electric field does work when the test body moves along the field lines; the work only depends on the initial and final position of the object and not the path connecting the two positions35
9493212347levelthe set of points in the electric field when moving a test body between these points there is no work done by the electric field on the test body36
9493222876conservative fieldthe amount of work done on the test body by the field is independent of the shape of the path37
9493228357voltagevoltage gives the work done on a unit positively charged test body by the electric field while carrying it from one level to another38
9493237668potentialthe needed amount of work to carry a unit positively chraged test body from zero level to a certain point39
9493247732potential energythe amount of energy gained by the test body while carrying it from the zero level to another one40
9493258403principle of energy conservation in an electric fieldthe total amount of energy of a test body in an electric field is constant in time41
9493272578conductors in an electric field-the charges accumulate on the surface of the conductor as a result of the repulsion of like charges -field lines started from a conductor behaving as a source body are perpendicular to the surface -all the points of the surface of a conductor have the same potential->they form a level -when placing a conductor in an electric field a new electric field is generated in which the field lines are the opposite of the original ones. Because of this the resultant electric force inside a conductor is always 0, so no electric effects can be experienced inside the conductor. This is the phenomenom of shielding42
9493318094pinpoint effectelectric charge is accumulated on the surface of a metalic conductor at positions of biggest curvature43
9493326648electric windthe wind blowing from a source body as a result of repulsoin of like charges44
9493336518electric capacitancecapacitance gives the needed amount of charge to generate a unit potential difference45
9493366473condensora special type of electric instrument consisting of two pieces of oppositely charged metal which can store a large amount of charge on the surface46
9493377096polarizationin an insulator bc of the rotation of the dipole molecules the resultant electric field stregth decreases when putting it between two condensor plates47
9493401718series combination of condensors-all the charges are equal -the total amount of voltage is equal to the sum of the voltages -there is inverse propotion between the voltages dropping between the two plates of the condensors and the capacitances -the reciprocal of the equivalent capacinótance is equal to the sum of the reciprocals of the capacitances of the original condensors48
9493473125equivalent capacitancethe capacitance of the imaginery condensor substituting the original ones so that it has the same effects as them49
9493481750main branchfrom the positive pole to the first junction and from the last junction to the negative pole50
9493489752junctionwhere the brances meet51
9493492177parallel combination of condensors- the total amount of charge is equal to the sum of the charges -all the voltages are equal -there is direct propotion between the charges and the capacitances -the equivalent capacitance is the sum of the capacitance of the original condensors52
9493518421electric energythe amount of energy stored inside the electric field of the condensor53
9493524165electric currentthe ordered flow of electric charge54
9493528904direct currentcharge flows to the same direction55
9493533689alternating currentthere is periodic change in the direction of the flow of the charge56
9493539972current intensitythe amount of charge flowing through a certain crossection of the wire in a unit time57
9493548038superconductorsspecial type of metals or coils of metals in which when starting an electric current the current intensity will be constant without applying an electric source58
9493557860heat effect of electric currentit is a direct and compulsory effect e.g.: oven, hairdryer, electric heat radiator...59
9493569446magnetic effect of electric currentit is a direct and compulsory effect e.g.: electromagnet (coil of wire+iron core; current->magnetization->good bc its strength can be easily changed)60
9493576824chemical effect of electric currentdirect effect of direct current but not alternating current61
9493595155electrolysisany type of process during which chemical reactions are started as the effect of the electric current driven into certain materials62
9493618945electrodea piece of metal submerged into an electrolyte63
9493623900indifferent electrodean electrode made of stable materilas so that it carries the current inside the water solution but it doesn't take part in chemical reactions64
9494713863biological effect of electric currentit is a consequence of the other effects (heat nad chemical): muscles contract, burn- the human body acts as a watersolution65
9494724950light effect of electric currentit is a consequence of the other effects66
9494731613conditions of the flow of the electric current between two points-there is potential difference between the points -the points are connected with a conductor67
9494739636technical direction of currentby definition current cosists of positive charges68
9494745732real direction of currentin reality electrons (negative charges) flow69
9494752867electric sourcean instrument carrying electric charge from the position of lower potential to the position of higher potential (work is done)70
9494761785types of electric sources-galvanic cell -generator -solar cell71
9494764016galvanic cellelectric source producing electricity with the help of chemical reactions72
9494769974redoxi reactionelectron transport from a certain material to another73
9494773641generatoran instrument producing electricity with the help of electromagnetic induction (e.g.:dynamo)74
9494780126motional inductioncurrent is induced inside a coil of wire surrounding a rotating magnet75
9494789067solar cellan instrument made of semiconducting materials in which electron transportation is generated when exposed to light76
9494794293diodany type of instrument which regulates the direction of the current77
9494799304consumerany type of instrument which uses the energy of the current78
9494803288electric resistorany type of instrument on which the current has heat effect79
9494808526electric resistanceit gives the value of the needed voltage generating unit current intensity between two points80
9494815383resistance depends on-length of wire -cross section of wire -material of the wire -temperature of the wire81
9494830377series combination of resistors-the current intensities are the same everywhere -the total amount of voltage is equal to the sum of the voltages of the original resistors -the equivalent resistance is equal to the sum of the original resistances -there is direct propotion between the voltages dropping on the resistors and the resistance values -advantage: many resistors of small resistance values have enough resistance together to work -disadvantage: if one of the resistors goes wrong none of them work -e.g.: christmas lights82
9494849549equivalent resistoran imaginery resistor substituting the original ones so that it has the same effect as that of the original ones83
9494886540parallel combination of resistors-the total current intensity is equal to the sum of the current intensities flowing through the original resistors -the voltage dropping on the resistors are equal everywhere -the reciprocal of the equivalent resistance is equal to the sum of the reciprocals of the resistances of the original resistors -there is inverse propotion between the current intensities and the resistance values -advantage: independent use -disadvantage: too many consumers can not work together -e.g.: electrical multi-outlet84
9494922329Wheatstone-bridgea type of bridge combination in which the ratio of the resistances in the two brances are equal85
9494929998Kirchoff's first lawthe algebraic sum of current intensities flowing towards or away from a junction is equal to 086
9494937356Kirchoff's second lawthe algebraic sum of the voltages dropping on the single resistors or generated by the sources is equal to 0 for a full cycle/loop in the circuit87
9494947695power of electric currentthe amount of heat developed in unit time88
9494952263short circuittwo points in a circuit are connected with a wire of 0 resistance89
9494956288potentiometerany type of instrument whose resistance can be changed easily90
9494961056internal resistancethe resistance inside the source which is always present91
9494965331internal voltagethe voltage dropping on the source itself92
9494968251full circuitalways contains the internal resistance of the source93
9494972428electromotoric forcethe maximum voltage which can be generated by the source94
9494978101the special case of opened circuit-the external resistance is infinite -the current intensity is 0 -the internal voltage is 0 -the electromotoric force is equal to the external voltage95
9494991545the special case of short circuit-the external resistance is 0 -the equivalent resistance is equal to the internal resistance -maximum current intensity96
9494998536ammeteran instrument measuring current intensity; it is always combined serially to get proper results97
9495005046ideal ammeterits resistance is almost 098
9495007511measurement limitmaximum current intensity/voltage which can be observed without the instrument going wrong99
9495015482shunta resistor combined parallelly with the ammeter to extend its measurement limit100
9495021790voltmetera type of instrument measuring voltage ; it is always combined parallelly to get the proper results; another serially combined resistor is neede to extend its measurement limit101
9495033850ideal voltmeterits resistance is close to infinite102

Physics Formulas, Physics Formulas Flashcards

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10515690642TorqueForce applied x lever arm length0
10515690643Local gravitational potential energyPE= mgh1
10515690644General gravitational potential energyPE= -GMm/r2
105156906453 types of conservative forcesFg, Felastic, Felectric3
105156906464 types of nonconservative forcesFf, Air, Fn, Ft4
10515690647What makes a force conservative?2 ways: 1. If the work done by the force on an object moving from one point to another depends only on the initial and final positions and is INDEPENDENT of the particular path 2. Net work done by the force on an object moving around a closed path is zero5
10515690648Work-energy theoremWork due to non-conservative force= change in kinetic + change in potential + any change in internal energy6
10515690649Conservation of mechanical energyTotal mechanical energy of a system remains constant as the object moves, provided that the net work done by non-conservative forces is zero7
10515690650Angular displacementarc length/radius8
10515690651Moment of inertiaTorque= moment of inertia x angular acceleration9
10515690652Energy used in rotating something1/2 I(inertia)w^210
10515690653Buoyant forceFb= density x volume displaced x g11
10515690654Doppler effectThe apparent frequency of the source is increased as the source approaches the observer, and is decreased at it leaves12
10515690655Elastic vs Inelastic collisions (in regards to KE and momentum)Elastic: KE and momentum are conserved Inelastic: KE is NOT conserved, momentum is13
10515690656Angular momentumL= moment of inertia x angular velocity14
10515690657Electric field due to a point chargeE=kQ/r^215
10515690658Electric potential energykQ1Q2/r16
10515690659Electric potentialV=kQ/r17
10515690660Force in a constant electric fieldF= qE18
10515690661Electric potential in a constant electric fieldV=Ed19
10515690662Electric potential energy in a constant electric fieldU= qEd=Vq20
10515690663Force on a charge moving in a magnetic fieldF=qvBsin(theta)21
10515690664Electric powerP=IV=I^2R= V^2/R22
10515690665Electric potential energy stored by a capacitorU= 1/2 CV^2 = 1/2QV= 1/2Q^2/C23
10515690666Total internal reflectioncritical angle= n2/n124
10515690667Index of refractionn=c/v, v2/v1=n1/n225
10515690668The lens equation1/object distance + 1/image distance= 1/focal length26
10515690669When is the focal length of the lens positive/negativepositive= converging negative= divergine27
10515690670When is object distance positive/negativepositive= on the side where light is coming from negative= on the opposite side28
10515690671When is image distance positive/negativePositive= opposite side of the lens from light Negative= same side29
10515690672Lateral magnificationm=hi/ho= -di/do30
10515690673Power of a lenseP=1/focal length31
10515690674Focal length of a spherical mirrorf=1/2 of the radius of curvature32
10515690675Power (kinematics)Power=work/time=Force x velocity33
10515690676centripetal accelerationacceleration= velocity^2/r34
10515690677Work (rotation)Work= torque x change in angular displacement35
10515690698Conservation of angular momentum36
10515690699Speed of a wave on a stretched string37
10515690700Speed of sound38
10515690701Frequency and period39
10515690702Frequency and angular velocity of a mass spring40
10515690703Frequency and angular velocity of a pendulum41
10515690704Four expressions for the density of water42
10515690705SI unit for pressure43
10515690706Relationship between pressure and depth44
10515690707Archimedes principle45
10515690678Displacement as a function of timex= vot + xo + 1/2at^246
10515690679Velocity of a ball you dropped from a buildingv= square root(2gh)47
10515690680Velocity in the x or y directionVx= vcos(theta) Vy=vsin(theta)48
10515690681Force of static frictionForce is less than or equal to the coefficient of static friction times the normal force49
10515690682Force on an inclined planeF=mgsin(theta)50
10515690683ImpulseI=force x change in time= mv51
10515690684Work done by constant forceW=fdcos(theta)52
10515690685Sound decibelsB=10log(Io/I)53
10515690686Beat frequencyFb= f2-f154
10515690687Electric forceKq1q2/r^255
10515690688Speed of lightc=E/B56
10515690689Energy of a photonE=hv/wavelength57
10515690690Resistance of a wiredensity(L/A)58
10515690691sin(30).559
10515690692cos(30).88660
10515690693sin(60).88661
10515690694cos(60).562
10515690695tan(30).57763
10515690696tan(45)164
10515690697tan(60)1.7 (square root of 3 over 1)65
10515690709Wave Speedv = F * Lambda(wavelength)66
10515690710Average speedtotal distance / time67
10515690711MOTION formula 1 without adisplacement = 1/2(Vo + V)t68
10515690712MOTION formula 2 without vdisplacement = Vot + 1/2at^269
10515690713MOTION formula 3 without Vodisplacement = vt - 1/2at^270
10515690714MOTION formula 4 without displacementV = Vo + at71
10515690715MOTION formula 5 withoutV^2 = Vo^2 +2a(displacement)72
10515690716Newtons second lawF = ma73
10515690717strength of Gravitational ForceF = G * (M1*M2/r^2)74
10515690718WeightFg = g * m75
10515690719PEmgh76
10515690720KE1/2 mv77
10515690721PowerWork/Time78
10515690722Conversion of Mechanical EnergyK1 + U1 = Kf + Uf79
10515690723ImpulseAverage Force * time80

AP US History Decades Review Flashcards

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80452325401491 - 1607Discovery of America, Christopher Columbus, Columbian Exchange, Conquistadors, Encomienda system, Diseases0
80452325411607 - 1700Jamestown, Chesapeake Colonies, New England Colonies, Middle Colonies, Slave trade, indentured servants, Puritans, House of Burgesses, Pilgrims-Mayflower Compact, 1676/ Bacon's Rebellion, Salem Witch Trials, Tobacco1
80452325421700 - 1750The First Great Awakening, Enlightenment, Stono Rebellion2
80452325431760sStamp Act, Proclamation of 1763, Townshend Acts, Pontiac's Rebellion3
80452325441770sCommon Sense, Declaration of Independence, The Townsend Acts, The Continental Congress appointed George Washington, American Revolution4
80452325451780sConstitution ratified, Shays Rebellion, Land ordinances - western settlement, Federalists vs Antifederalists, First us president (washington)5
80452325461790sBank of the United States, Report on Manufactures, Washington's neutrality proclamation, Jay's Treaty, Whiskey Rebellion, Inauguration of John Adams, XYZ affair, Alien and Sedition Acts, John Fries's Rebellion6
80452325471800sUnited States Presidential Election, The Michigan Territory, The Illinois Treaty , Louisiana purchase7
80452325481810sPanic of 1819, The American System, War of 18128
80452325491820sThe Second Great Awakening, Missouri Compromise, Monroe Doctrine, Andrew Jackson elected president9
80452325501830sIndian Removal Act, Worcester v Georgia, Nat Turner's Rebellion, Nullification Crisis, Bank War, Trail of Tears10
80452325511840sMexican-American War, Free Soil Party, Treaty of Guadalupe Hidalgo, Seneca Falls Convention, Wilmot Proviso11
80452325521850sBleeding Kansas, Compromise of 1850, Kansas-Nebraska Act, Dred Scott Decision, Fugitive Slave Act12
80452325531860sCivil War, Emancipation Proclamation, President McKinley assassinated, Homestead Act, Reconstruction, Radical Republicans, KKK, 13th and 14th amendments, Civil Rights Act13
80452325541870s15th Amendment, Compromise of 187714
80452325551880sSitting Bull imprisoned, Civil Service Act, Elk v. Wilkins, Haymarket affair, Wabash v. Illinois, Statue of Liberty dedicated, Dawes Act, Interstate Commerce Commision created15
80452325561890sWounded Knee Massacre, Plessy v. Ferguson, President McKinley, US gains Puerto Rico, Guam, the Philippines and Cuba following the Spanish-American war16
80452325571900sThe Platt Amendment, Cuban Independence, Roosevelt President, William Taft President, The Pure Food and Drug Act and the Meat Inspection Act is passed17
80452325581910sWW1, Sixteenth Amendment Ratified, Seventeenth Amendment Ratified, Federal Reserve Established, Clayton Act, Lusitania sinks, Zimmerman Telegram, Espionage Act, "Fourteen Points", Red Scare, 18th Amendment18
80452325591920sProhibition, Stock market crash , Flappers (rebellion) , Scopes Trial, ERA, Women gain the right to vote(19th amendment)19
80452325601930sFDR, New Deal, End of Prohibition, The Dust Bowl, Social Security, GD20
80452325611940sWWII, FDR still president, D-Day, First Atomic Bomb testing, Pearl Harbor, Hiroshima and Nagasaki Atomic bombs, Jackie Robinson, Marshall Plan, NATO21
80452325621950sBaby Boomers, Beat Generation, Sputnik, Ethel and Julius Rosenberg, Korean War, Desegregation of public schools22
80452325631960sCold War Continuation, LBJ, Kennedy Years, Great Society, Woodstock, Space race, bay of pigs invasion23
80452325641970sCarter Administration, Roe v Wade, Feminist Movement, Stagflation, Vietnam War24
80452325651980sTriumph of conservatism, Title IX, Ronald Reagan25
80452325661990sBill Clinton, End of Soviet Union, NAFTA, OKC bombing, Computer revolution, rapid globalization, Multiculturalism, unprecedented diversity26
80452325672000sGeorge Bush Elected President, 9/11, No Child Left, Behind Act, USA Patriot Act, Department of Homeland Security Established, Obama elected27
80452325682010sObama Administration, Mobilization of Tea Party, Gay marriage legalized28

AP Chemistry Flashcards

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13906489454Oxidationloss of electrons0
13906489455Reductiongain of electrons1
13906498904Oxidea binary compound of oxygen with another element or group.2
13906504333Oxidizing agentelectron acceptor3
13906507347Reducing agentelectron donor4
13906516611Strong AcidsHCl, HBr, HI, HNO3, H2SO4, HClO45
13906520013Strong bases1A and heavy 2A hydroxides6
13906546900gas forming reactionsH2CO3 -> H2O + CO2 S + H2 -> H2S(g)7
13906557366Electrolytedissociates8
13906562144strong electrolytedissociates completely9
13906566466weak electrolytepartially dissociate10
13906577040Periodicitythe repeating pattern of chemical and physical properties of the elements11
13906577042Coulombs LawF=K q₁*q₂/r²12
13906585298Zeff (effective nuclear charge)Z (Atomic #) - S (Screening constant = #inner electrons)13
13906602440Size of Atom trendIncreases down and left (Zeff increases)14
13906614909Size of ions- Cations are smaller than original atom - Anions are larger - Ion size increases down a group - From left to right they get smaller (because nuclear charge increases), then suddenly larger (once it changes from cations to anions)15
13906620512Ionization energyThe amount of energy required to remove an electron from an atom16
13906625198Ionization energy trendincreases up and to the right17
13906635480Smaller atoms have ___ ionization energieshigher18
13906642143electron affinitythe energy change that occurs when an electron is acquired by a neutral atom19
13906646192electron affinity trendincreases to the right and up20
13906655655lattice energythe energy released when one mole of an ionic crystalline compound is formed from gaseous ions21
13906657346Lattice energy trendincreases up and to the right22
13906660713ElectronegativityA measure of the ability of an atom in a chemical compound to attract electrons23
13906660715electronegativity trendincreases up and to the right24
13906667326Lewis dot structure steps25
13906698255free radicalschemical particles with an odd number of electrons26
13906700408Hypervalentmolecules and ions with more than an octet of electrons around the central atom27
13906702753electron domainin the VSEPR model, a region about a central atom in which an electron pair is concentrated28
13906706501Kinetic Molecular Theory of Gases1. gases made up of negligible volume 2. no intermolecular attractions/repulsions 3. elastical collisions 4. constant random motion 5. kinetic energy of gas is related to T 6. same moles of gas=same kinetic energy29
13906738308Celcius to KelvinK=C+27330
13906742475van der Waals equation[P+(an^2)/(V^2)][V-nb]=nRT a = strength of attraction b = Size of molecule31
13906756410Real Gas LawReal gasses only conform to PV=nRT at Low pressures High temps32
13906774475EffusionA process by which gas particles pass through a tiny opening33
13906776273DiffusionMovement of molecules from an area of higher concentration to an area of lower concentration.34
13906780719Kinetic energy of gasKE=1/2mv^2 Same Temp - KE = KE35
13906789700Grams law of effusion36
13906803854van der Waals forcesa slight attraction that develops between the oppositely charged regions of nearby molecules37
13906808402London dispersion forces- Attractions between momentary dipole - All molecules - Polarizability38
13906823114London Dispersion forces are effected by...Usually Weak Shape - Long skinny have stronger Weight - Increases with molecular weight. Larger clouds are easier to polarize39
13906832748dipole-dipole forcesattractions between oppositely charged regions of polar molecules40
13906837310dipole-dipole forces are effected by...Polarity - Increases with increase in polarity41
13906856563Hydrogen BondingVery Strong Dipole-Dipole interaction with H + N, O, or F42
13906867447Viscosityresistance to flow43
13906868963surface tensionA measure of how difficult it is to stretch or break the surface of a liquid44
13906868964Vapor Pressure- As temp rises, the fraction of molecules having enough energy to escape increases - Pressure increase45
13906905665Boiling poingWhen its Vapor pressure = Atmospheric Pressure46
13906908591Normal Boiling PointThe T that VP is 760 torr or 1 ATM47
13906914380Heat of fusionAmount of energy required to change a substance from the solid phase to the liquid phase.48
13906914381heat of vaporizationThe amount of energy required for the liquid at its boiling point to become a gas49
13906916823Triple Point3 phases coexist50
13906923821rate of reaction depends onCatalyst Higher Temp Concentration Homogeneous mixture51
13906933541Reaction rate equation (change in concentration-Δ[A]/Δt = Δ[B]/Δt52
13906942699steric factorSize + Orientation53
13906950394Rate Equationrate = K[A]^a[B]^b54
13923106378Activated complexa transitional structure that results from an effective collision and that persists while old bonds are breaking and new bonds are forming55
13923112000Maxwell-Boltzmann distributionThe distribution of energies (and therefore speeds) of the molecules in a gas or liquid.56
13923138907Arrhenius equationK=Ae^(-Ea/RT) k is the rate constant A is pre-exponential factor: how often particles collide in correct orientation.57
13923212924reaction mechanismthe step-by-step sequence of reactions by which the overall chemical change occurs58
13923222789elementary reactiona reaction in which reactants are converted to products in a single step59
13923240000molecularitythe number of molecules that participate as reactants in an elementary reaction60
13923245948rate law and order for elementary reactions is determined byCoefficients61
13923295642Kp to KcKp = Kc(RT)^delta n62
13923303754Kp = Kc whenthere are the same number of moles of gas on each side of the equation63
13923308986Keq > 1products are favored64
13923311526Keq < 1reactants favored65
13923330309k = q whenSystem is in equilibrium66
13923339118Equilibrium QuotientQ = [Products]/[Reactants]67
13923905469Q > Kshift left68
13923908069Q < Kshift right69
13923917227AmphiproticA species that can either accept or donate a proton.70
13923917228Amphoterica substance that can act as both an acid and a base71
13923930504Kw1.0 x 10^-1472
13923930505pH= -log[H+]73
13923944849% Ionization[H3O+eq]/[HAinitial] x 10074
13923964716Kaacid dissociation constant75
13923964717Kbbase dissociation constant76
13923972850Higher Kbstronger base77
13923972851Lower Kaweaker acid78
13923975356Higher Kastronger acid79
13923975357Lower Kbweaker base80
13923981939polyprotic acidan acid that can donate more than one proton per molecule81
13923987418Ka * KbKw82
13923991850pH + pOH =1483
13923991852pKa + pKb =pKw = 1484
13924011211Factors affecting acid strenght- Polarization of Hx bond - Stronger bond = weaker acid - Less stability = weaker acid85
13924023595If x is in same group bond strenght is _ importantmore86
13924048284If x is in the same period, bond polarity is _ importantmore87
13924059537Carboxilic AcidCOOH88
13924078269Carboxilic Acids draw ___ from ___ Increase ___ of bond Increases ____- Electron density, OH bond - Polarity - Acidity89
13924094001Bottom Line of acid strenghtAnything that pulls electrons away from the ionizable hydrogen (making a weaker bond) makes the acid more acidic90
13924113626common ion effecta decrease in the solubility of an ionic compound caused by the addition of a common ion91
13924116202Buffercompound that prevents sharp, sudden changes in pH92
13924119509Henderson-Hasselbalch equationpH = pKa + log [A-]/[HA]93
13924124516Strong acid-strong base titration curveequivalence point: pH=794
13924134039Weak acid-strong base titration curveEquivalence point is greater than 7, has a halfway equivalence point95
13924144006strong acid weak base titrationSlow decline in pH followed by a rapid decrease at equivalence point. End point of indicator should be < 7.96
13924196420Ksp =[prodA][prodB] (the bigger, the more soluble)97
13924207529Heat up and cool downq = mc{delta}t98
13924216368Phase Changeq = n{delta}h fus/vap99
13924230060Hess's lawthe overall enthalpy change in a reaction is equal to the sum of enthalpy changes for the individual steps in the process100
13924238421calorimetry equationmcdeltaT=mcdeltaT101
13924286760deltaSsurr=-deltaH/T102
13924300068Oxidation occurs at theanode103
13924302664Reduction occurs at thecathode104
13924307321electromotive force (emf)The power supplied by the supply per unit current.105
13924328654A stronger oxidizing agent exhibits more _______Positive reduction potential106

AP Chemistry Flashcards

Terms : Hide Images
13722069404atomic numbernumber of electrons/protons in the atom0
13722069405molar massaverage mass of a single atom measured in amus; also the average mass for one mole of the atom in grams1
13722069406periodshorizontal rows2
13722069407groupsvertical rows3
13722069408alkali metalsG1 elements4
13722069409alkaline earth metalsG2 elements5
13722069410transition metalsG3 through G126
13722069411halogensG177
13722069412noble gasesG188
13722069413lanthanides and actinidesrare earth elements; inner transition metals9
13722069414protonpositively charged particle in the nucleus; # of which determines the properties of an element10
13722069415neutronneutral particles in the nucleus of an atom11
13722069416electronsmall, negatively charged particle surrounding an atom in orbitals12
13722069417mass numbersum of protons and neutrons13
13722069418isotopeelement with a different number of neutrons14
13722069419mass spectrometrymass of various isotopic elements to create a mass spectrum graph15
13722069420moleunit used to represent large numbers of small particles such as atoms, molecules, electrons, or ions16
13722069421avogadros number6.022 E2317
13722069422ideal gas lawpv=nrt18
13722069423? L/mol22.4 L19
13722069424percent compositionpercent by mass of each element that makes up a compound; mass part/mass whole20
13722069425empirical formulasimplest ratio of the molecules making up a compound21
13722069426molecular formulaactual formula for a substance22
13722069427aufbau principlee- are placed in orbitals, subshells, and shells in order of increasing energy23
13722069428quantizede- can only exist at specific energy levels separated by specific intervals24
13722069429pauli exclusion principletwo electrons who share an orbital cannot have the same spin (must be clockwise and counterclockwise); magnetic moment25
13722069430hunds rulewhen an electron is added to a subshell it will always occupy an empty orbital if one is available26
13722069431coulombs lawthe amount of energy that an electron has depends on its distance from the nucleus of an atom; e=k(q1*q20)/r27
13722069432quantum theoryelectromagnetic energy is quantized; for a given frequency of light or radiation, all possible energies are multiples of a certain unit (a quantum)28
13722069433quantum energy equatione=hv29
13722069434bohr modeleach energy level is represented by a row in the periodic table30
13722069435electromagnetic radiationthe form in which atoms absorb energy31
13722069436when electron drops to a lower energy levelthen electromagnetic radiation is released (energy)32
13722069437frequency and wavelength areinversely proportional; c=hv33
13722069438ionization energyamount of energy necessary to remove electrons from an atom (electromagnetic energy exceeds binding energy)34
13722069439unit for binding energykj/mol or Mj/mol35
13722069440kinetic energyenergy of motion36
13722069441photoelectron spectra (pes)charted amounts of ionizations energies for electrons ejected from a nucleus; can be used to identify elements37
13722069442ionan atom which has either gained or lost electrons38
13722069443anionparticle with more electrons than protons; negatively charged39
13722069444cationparticle with less electrons than protons; positively charged40
13722069445daltonmodern atomic theory; elements combined in different ratios; are never created nor destroyed in chemical reactions41
13722069446mendeleev & meyerindependent proposals of early periodic tables42
13722069447thomsons experimentcathode ray tube; deflection of charges that concluded atoms are composed of positive and negative particles43
13722069638plum pudding model44
13722069448millikans experimentcalculated charge on an electron by examining the behavior of charged oil drops in an electric field45
13722069449rutherfords experimentfired alpha particles at gold foil and observed how they scattered; concluded that all of the positive charge was concentrated in the center and that an atom is mostly empty space46
13722069450heisenberg uncertainty principleit is impossible to know both the position and momentum of an electron at a particular instant; means electron orbitals do NOT represent specific orbits47
13722069451shielding electronselectrons between a valence electron and the nucleus that decreases the attraction between the nucleus and the valence electron48
13722069452stable atoms have... completed shells49
13722069639metalloids50
13722069453atomic radiusapproximate distance from the nucleus of an atom to its valence electrons51
13722069454periodic trend: left to rightperiodic trend: atomic radius decreases; protons are added to the nucleus so valence electrons are more strongly attracted ionization energy increases (protons are added to the nucleus)52
13722069455periodic trend: down a groupperiodic trend: atomic radius increases; shells of electrons are added which shield the more distant shells and valence e- get farther away ionization energy decreases (shells of e- added, each inner shell shields more and reduces the pull on valence e- so they are easier to remove)53
13722069456periodic trend: cationsperiodic trend: ... are smaller than atoms; e- is removed and a shell is lost and electron-electron repulsions are reduced54
13722069457periodic trend: anionsperiodic trend: ... are larger than atoms; e- is added, electron-electron repulsions increase and valence electrons move farther apart55
13722069458ionization energy magnitudessubsequent energies are larger because the e-e repulsion decreases and the remaining valence e- are closer to the nucleus; once a shell is empty the energy required to remove an e- from a full shell is significantly greater than previous energies56
13722069459electronegativityhow strongly the nucleus of an atom attracts the electrons of other atoms in a bond57
13722069460factors that affect electronegativitysmaller atom; greater EN closer the element is to having a full energy level; higher EN58
13722069461EN trendsleft to right; EN increases down a group; EN decreases59
13722069462bondingtransfer or sharing of electrons60
13722069463ionic solidcompound held together by electrostatic attractions that are in a lattice structure; weak conductors (e- are localized around a single atom); no IMFs61
13722069464ionic bondbond between metal and nonmetal; electrons are NOT shared: the cation gives an e- up to the anion62
13722069465properties of ionic solidsare solid at room temperature; high melting and boiling points63
137220694662 factors that affect melting points in ionic substancesprimary factor: charge on the ions (greater charges, greater Coulombic attraction) secondary factor: smaller atoms (greater Coulombic attraction)64
13722069467salts have __________ bondingionic bonding65
13722069468metallic bondingbond between two metals; sea of electrons that make metals such good conductors; delocalized structure allows for malleability and ductility66
13722069469interstitial alloymetal atoms with vastly different radii combine; ex. steel67
13722069470substitutional alloymetal atoms with similar radii combine; ex. brass68
13722069471covalent bondsbond in which two atoms share electrons; each atom counts the e- as a part of its valence shell69
13722069472single bondsone sigma bond, one e- pair; longest bond, least energy70
13722069473double bondsone sigma bond, one pi bond; two e- pairs71
13722069474triple bondsone sigma bond, two pi bonds; 3 e- pairs; shortest bond, most energy72
13722069475network covalent bondslattice of covalent bonds; network solid (acts similar to one molecule); very hard, high melting/boiling points; poor conductors73
13722069476the common network solidsSiO2,74
13722069477dopingthe addition of an impurity to an existing lattice75
13722069478p-dopingcreate a hole (positively charged) that draws electrons through the substance (add a substance with one LESS valence e-) i.e. si + al76
13722069479n-dopingadd a substance with one MORE valence e- which leaves a free e- to travel freely i.e. si + p77
13722069480polarityexists when a molecule has a clustering of negative charge on one side due to unequal sharing of electrons (e- are pulled to the more electronegative side); creates dipoles in molecules78
13722069481dipole momentthe measurement of the polarity of a molecule; the unit of measurement is a debye (D)79
13722069482more polar molecule........ larger dipole moment80
13722069483intermolecular forces (IMFs)forces that exist between molecules in a covalently bonded substance; not bonds81
13722069484dipole-dipole forcesthe positive end of one polar molecule is attracted to the negative end of another molecule; relatively weak attraction force82
13722069485hydrogen bondingstrong IMF between two moelcules; F, O, N; have higher melting and boiling points than molecules with other IMFs83
13722069486london dispersion forcesIMFs that occur between all molecules; occur because of the random motions of electrons on atoms within molecules to create instantaneous polarities; molecules with more e- will have greater _________________ forces84
13722069487substances with only london dispersion forces usually...... are gases at room temp, and boil/melt at extremely low temps85
13722069488melting & boiling points of a covalent substance is almost always _____________ than that of ionic substanceslower86
13722069489vapor pressurethe pressure exerted by a vapor over a liquid87
13722069490vaporizationthe process by which molecules with enough KE inside a liquid break the surface of the liquid and transition into the gaseous phase; no outside energy is needed i.e. no heating88
13722069491vapor pressure is primarily dependent ondependent on IMFs89
13722069492resonance structuresstructures that occur when it is possible to draw two or more valid lewis electron dot diagrams that have the same number of electron pairs for a molecule or ion90
13722069493formal chargeused to find which structure is most likely to occur; valence - assigned91
13722069494assigned e-lone pairs of e- count as two and bonds count as one92
13722069495valence shell electron-pair repulsion model (VSEPR)model used to predict molecular geometry based on the principle that electrons repel each other and therefore are as far apart as possible in a structure93
13722069496hybrid orbitalsorbitals that have the properties to explain the geometry of bonds between atoms94
13722069497linear geometrysp hybridization 0 lone pairs ex. BeCl2 & CO295
13722069498trigonal planar geometrysp2 hybridization bond angles 120 0 lone pairs: trigonal planar (three bonds) 1 lone pair: bent (two bonds)96
13722069499tetrahedral geometry4 e- pairs, sp3 hybridization angles 109.5 0 lone pairs: tetrahedral (four bonds) [CH4, NH4+, ClO4-, SO4 2-, PO4 3-] 1 lone pair: trigonal pyramidal (3 bonds) [NH3, PCl3, SO3 2-] 2 lone pairs: bent (2 bonds) [H2O, OF2, NH2-]97
13722069500trigonal bipyramidal geometry5 e- pairs, sp4 hybridization 0 lone pairs: trigonal bipyramidal (5 bonds) [PCl5, PF5] 1 lone pair: seesaw (4 bonds) [SF4, IF4+] 2 lone pairs: t-shaped (3 bonds) [ClF3, ICl3] 3 lone pairs: linear (2 bonds) [XeF2, I3-]98
13722069501octahedral geometry6 e- pairs, sp5 hybridization 0 lone pairs: octahedral (6 bonds) [SF6] 1 lone pair: square pyramidal (5 bonds) [BrF5, IF5] 2 lone pairs: square planar (4 bonds) [XeF4]99
13722069502kinetic molecular theorythe theory that all matter is composed of particles (atoms and molecules) moving constantly in random directions100
13722069503KE=0.5mv^2average kinetic energy of a single gas molecule (ideal gas)101
13722069504ideal gas(gas) high temperature, low pressure, no attractive forces, in constant motion without losing energy102
13722069505maxwell-boltzmann diagramsshows the range of velocities for molecules of a gas103
13722069506effusionthe rate at which a gas will escape from a container through microscopic holes in the surface of the container104
13722069507factors that affect rate of effusionspeed of gas molecules (so ________ increases with higher temperature and lower mass)105
13722069508combined gas law(P1*V1)/T1=(P2*V2)/T2106
13722069509boyles lawif temperature is constant: as pressure increases, volume decreases as volume increases, pressure decreases107
13722069510charles lawif pressure is constant: as temp increases, volume increases108
13722069511if volume is constant:as pressure increases, temperature increases109
13722069512daltons lawthe total pressure of a mixture of gases is just the sum of all the partial pressures of the individual gases in the mixture110
13722069513partial pressurethe pressure of each gas in a mixture; is directly proportional to the number of moles of gas in the mixture Pa = (Ptotal) (moles of A/total moles)111
13722069514molaritythe concentration of a solution in terms of moles of solution/volume (L)112
13722069515mole fractionmoles of substance/total moles in solution113
13722069516solutesubstance being dissolved114
13722069517solventa liquid substance capable of dissolving other substances115
13722069518dissociationwhen ionic substances break up into ions into solution116
13722069519electrolytesfree ions in solution that conduct electricity117
13722069520paper chromatographythe separation of a mixture by passing it through a medium in which the components of the solution move at different rates118
13722069521retention factorstronger the attraction between the solute and the solvent front is, the larger the Rf value will be119
13722069522column chromatographya column is packed with stationary substance, then the solution to be separated (analyte) is injected into the column where it adheres to the stationary phase, then the eluent solution is injected into the column. as the eluent solution passes through the stationary phase the analyte molecules will be attracted to it with varying degrees of strength based on polarity120
13722069523distillationthe process that separates the substances in a solution based on their boiling points121
13722069524saltan ionic compound made from the neutralization of an acid with a base122
13722069525synthesis reactionwhen elements or simple compounds are combined to form a single, more complex compound123
13722069526decomposition reactiona reaction where a single compound os split into two or more elements or simple compounds, usually in the presence of heat; opposite of a synthesis124
13722069527acid-base reactiona reaction when an acid reacts with a base to form water and a salt125
13722069528oxidation-reduction reactiona reaction that results in the change of the oxidation states of some participating species126
13722069529hydrocarbon combustionhydrocarbon + oxygen --> carbon dioxide + water a substance is ignited (usually a hydrocarbon) and it reacts with oxygen in the atmosphere; products are always CO2 and H2O127
13722069530precipitation reactiona reaction in which an insoluble substance (salt) forms and separates from the solution128
13722069531net ionic equationan equation for a reaction in solution showing only those particles that are directly involved in the chemical change129
13722069532limiting reactantthe substance that controls the quantity of product that can form in a chemical reaction; moles of each reactant divided by moles used in reaction130
13722069533hydrocarbonan organic compound composed only of carbon and hydrogen131
13722069534law of conservation of massmatter can be neither created nor destroyed during a chemical reaction132
13722069535gravimetric analysisa type of quantitative analysis in which the amount of a species in a material is determined by converting the species to a precipitate that can be isolated completely and weighed133
13722069536when bonds are formed...energy is released134
13722069537when bonds are broken...energy is absorbed135
13722069538exothermicproducts have stronger bonds than the reactants; heat is released, - ΔH136
13722069539endothermicreactants have stronger bonds than the products; heat is absorbed, + ΔH137
13722069540activation energythe minimum amount of energy required to start a chemical reaction138
13722069541catalystsubstance that speeds up a reaction by reducing the activation energy required by the reaction; provides an alternate reaction pathway; no effect on equilibrium conditions139
13722069542oxidation number: H+1140
13722069543oxidation number: alkali metals+1141
13722069544oxidation number: alkaline earth metals+2142
13722069545oxidation number: oxygen-2143
13722069546oxidation number: halogens-1144
13722069547hydroxideOH-145
13722069548nitrateNO3-146
13722069549acetateC2H3O2-147
13722069550cyanideCN-148
13722069551permanganateMnO4-149
13722069552carbonateCO3 2-150
13722069553sulfateSO4 2-151
13722069554dichromateCr2O7 2-152
13722069555phosphatePO4 3-153
13722069556ammoniumNH4+154
13722069557half-reactionsthe two parts of an oxidation-reduction reaction, one representing oxidation, the other reduction155
13722069558titrationthe slow addition of a solution at a known concentration to another solution in order to determine the concentration of the unknown solution; color change is often used as an end point156
13722069559galvanic (voltaic) cella favored redox reaction in a cell is used to generate an electric current157
13722069560currentunit: amperes (amps); the flow of electrons from one place to another158
13722069561anodewhere oxidation takes place159
13722069562cathodewhere reduction takes place160
13722069563electrolyctic cellan outside source id used to force an unfavored redox rxn to take place161
13722069564purpose of a salt bridgemaintains electrical neutrality in the cell162
13722069565favored redox reaction+E163
13722069566unfavored redox reaction-E164
13722069567elecroplatinga process that uses electric current to reduce dissolved metal cations so that they form a thin metal coating on an electrode165
13722069568rate lawan expression relating the rate of a reaction to the concentration of the reactants166
13722069569first order rate lawy= ln[a] subscript (t) m= -k x= time b= ln[a] subscript (0)167
13722069570half-lifethe amount of time it takes for half of a sample to disappear; t1/2=0.693/k168
13722069571second order rate law[a] sub. (t) = concentration of reactant A at time (t) [a] sub. (0) = initial conc. of A k = rate constant t = time elapsed169
13722069572zero order rate lawsrate does not depend on the concentration of the reactants at all therefore rate is always the same at a given temperature; rate=k170
13722069573collision theorytheory that collisions occur because reactants are constantly moving around and colliding with one another171
13722069574effective collisionscollisions in which the conditions of the collision theory are met (and therefore the reaction occurs)172
13722069575ineffective collisionscollisions in which the conditions of the collision theory are not met (and therefore reaction does not occur)173
13722069576spectrophotometeran instrument that measures the proportions of light of different wavelengths absorbed and transmitted by a pigment solution174
13722069577beer's lawA=abc A=absorbance a=molar absorptivity b=path length; the distance the light is traveling through the solution c=concentration of the solution175
13722069578rate-determining stepthe slowest step in a reaction mechanism that determines the overall rate of the reaction176
13722069579elementary stepsa series of simple reactions that represent the progress of the overall reaction at the molecular level177
13722069580workforce exerted on an object that causes it to move178
13722069581first law of thermodynamicsthe energy of the universe is constant179
13722069582second law of thermodynamicsif a process is favored in one direction, then it cannot be favored in the reverse reaction; and an increase in entropy promotes favored reactions180
13722069583entropyΔS; a measure of the randomness or disorder of the system181
13722069584enthalpyΔH; heat of a system at constant pressure182
13722069585Gibbs free-energyΔG; a measure of whether or not a process will proceed without the input of outside energy ∆G=∆H-T∆S (T in degrees Kelvin) when ΔG=0, the reaction is at equilibrium183
13722069586state functionsfunctions that depend only on the change between the initial and final states of a system and therefore independent of the reaction pathway (catalyst has no effect) ΔS, ΔH, ΔG184
13722069587standard state conditionsall gases are 1 atm all liquids are pure all solids are pure all solutions are 1 molar the energy of formation of an element in its normal state is defined as zero the temperature used is 25C or 273K185
13722069588ΔH°f (heat of formation)the change in energy that takes place when one mole of a compound is formed from its pure components under STP186
13722069589STPstandard temp. and pressure187
13722069590bond energythe energy required to break a bond; endothermic process (add energy)188
13722069591hess's lawif a reaction can be described by a series of steps, then ΔH for the overall reaction is the sum of the ΔH values for all the steps189
13722069592rules of hess's law1. if you flip the equation, flip the sign on ΔH 2. if you multiply or divide an equation by a #, multiply ΔH by the same # 3. if several equations in summation create a new equation, you can also add the ΔH values of those component equations to get the ΔH value for the new equation190
13722069593enthalpy of solutionthe amount of energy released or absorbed as heat when a specific amount of solute dissolves in a solvent191
13722069594solid to liquidmelting192
13722069595liquid to solidfreezing193
13722069596liquid to gasvaporization194
13722069597gas to liquidcondensation195
13722069598solid to gassublimation196
13722069599gas to soliddeposition197
13722069600heat of fusionthe energy that must be absorbed by a solid to melt it198
13722069601heat of vaporizationthe energy that must be put into a liquid to turn it into a gas199
13722069640phase diagram (water)200
13722069602calorimetrythe measurement of heat changes during chemical reactions201
13722069603specific heatthe amount of heat required to the temperature of one gram of a substance by one degree celsius202
13722069604heating/cooling curvescurves that display what happens to the temperature of a substance as heat is added203
13722069605spontaneousthermodynamically favored; -ΔG204
13722069606nonspontaneousthermodynamically unfavored; +ΔG205
13722069607at low temperatureenthalpy is dominant; ΔH206
13722069608at high temperatureentropy is dominant; ΔS207
13722069609voltage vs favorabilitya redox reaction is favored if voltage is (+)208
13722069610hydration energythe energy required to break hydrogen bonds209
13722069611law of mass actionthe rate of a chemical reaction is proportional to the product of the concentrations of the reactants210
13722069612a solution is at equilibrium whenthe rate of the forward reaction is equal to the rate of the reverse reaction211
13722069613large k eq valueproducts are favored at equilibrium212
13722069614small k eq valuereactants are favored at equilibrium213
13722069615le chateliers principlestates that if a stress is applied to a system at equilibrium, the system shifts in the direction that relieves that stress214
13722069616reaction quotientQ215
13722069617Q > Kprecipitate forms; reaction shifts left216
13722069618Q < Kprecipitate does not form; reaction shifts right217
13722069619Q = Kthe reaction is at equilibrium; voltage in a voltaic cell reaches zero218
13722069620common ion effecta decrease in the solubility of an ionic compound caused by the addition of a common ion219
13722069621Arrhenius acidsa substance that ionizes in water and produces hydrogen ions220
13722069622Arrhenius basesa substance that ionizes in water and produces hydroxide ions221
13722069623Brønsted-Lowry acidsa substance that is capable of donating a proton222
13722069624Brønsted-Lowry basesa substance that is capable of accepting a proton223
13722069625pH-log [H+]224
13722069626pOH-log [OH-]225
13722069627pKa-log [Ka]226
13722069628pKb-log [Kb]227
13722069629amphoterica substance that can act as both an acid and a base; ex. H2O228
13722069630strong acidsdissociate completely in water; reaction goes to completion and never reaches equilibrium229
13722069631weak acidmost of the acid molecules remain in solution and very few dissociate230
13722069632percent dissociationthe ratio of the amount of a substance that is dissociated at equilibrium to the initial concentration of the substance in a solution, multiplied by 100231
13722069633oxoacidsacids that contain oxygen; the more oxygens, the stronger the acid232
13722069634polyprotic acidsacids that can donate more than one H+233
13722069635Kw1.0x10^-14234
13722069636henderson hasselbachpH = pKa + log([A-]/[HA])235
13722069637buffersweak acids or bases that can react with strong acids or bases to prevent sharp, sudden changes in pH236

ap Flashcards

Terms : Hide Images
14322669041Phagocytosisdefend body against bacteria neutrophils ingest invading pathogens0
14322683068chemotaxisneutrophils are attracted to bacterial chemical products1
14322692406Diapedesisprocess by which wbc travel through capillaries to fight off infection2
14322697038hemophiliacoagulation factor deficiency3
14322745294Neutrophils50-70% phagocytize bacteria4
14322759249Eosinophils2-4% attack parasite worms5
14322763277basophils.5- 1 percent heparin- anticoagulant6
14322769798Monocytes3-8% crucial in defense against virus7
14322790534lymphocytes25% or more critical in immunity8
14322794552Plateletsblood clotting9

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