Terms : Hide Images
| 2438631127 | acid | compound that gives off H+ ions in solution | 0 | |
| 2438632469 | acidic | describes a solution with a high concentration of H+ ions | 1 | |
| 2438633405 | anion | ions with a negative charge | 2 | |
| 2438633406 | anode | the electrode where electrons are lost (oxidized) in redox reactions | 3 | |
| 2438636306 | atmospheres | common units for measuring pressure | 4 | |
| 2438636899 | atom | the smallest object that retains properties of an element. Composed of electrons and a nucleus (containing protons and neutrons) | 5 | |
| 2438639047 | atomic number | number of protons in an element | 6 | |
| 2438639554 | Avogadro's number | number representing the number of molecules in (1) mole: 6.022 * 10 to the 23 power | 7 | |
| 2438641892 | base | substance which gives off hydroxide ions (OH-) in solution | 8 | |
| 2438643385 | basic | having the characteristics of a base | 9 | |
| 2438647056 | Bohr's atom | He made significant contributions to the atom. He understood the line spectra--the reason why only certain wavelengths are emitted when atoms jump down levels | 10 | |
| 2438652073 | buffer solutions | solutions that resist change in their pH, even when small amounts of acid or base are added | 11 | |
| 2438654175 | catalyst | substances that speed up a chemical process without actually changing the products of reactions | 12 | |
| 2438655798 | cathode | electrode where electrons have gained (reduction) in redox reactions | 13 | |
| 2438656888 | cations | ion with positive charge | 14 | |
| 2438657432 | central atom | in a Lewis structure, usually the atom that is the least electronegative | 15 | |
| 2438658515 | charge | describes an object's ability to repel or attract other objects. Protons have a positive ...while electrons have a negative... Like ...repel each other, while opposites attract. | 16 | |
| 2438663665 | chemical changes | processes or events that have altered the fundamental structure of something | 17 | |
| 2438664653 | chemical equation | an expression of a fundamental change in the chemical substance | 18 | |
| 2438666110 | colligative properties | properties of a solution that depend only on the number of particles dissolved in it, not the properties of the particles themselves. The main ones are boiling point elevation and freezing point depression. | 19 | |
| 2438669327 | combustion | when substances combine with oxygen and release energy | 20 | |
| 2438671253 | compound | two or more atoms joined together chemically, with covalent or ionic bonds | 21 | |
| 2438671874 | concentration | the amount of a substance in a specified space | 22 | |
| 2438673205 | conjugate acid | a substance which can lose H+ ion to form a base | 23 | |
| 2438674592 | conjugate base | a substance which can gain H+ ion to form an acid | 24 | |
| 2438675919 | covalent bonds | when two atoms share at least one pair of electrons | 25 | |
| 2438676809 | decay | change of an element into a different element, usually with some other particle(s) of energy emitted | 26 | |
| 2438678469 | density | mass per unit volume of a substance | 27 | |
| 2438680053 | dipole-dipole forces | intermolecular forces that exist between polar molecules. Active only when the molecules are close together. The strengths of intermolecular attractions increase when polarity increases | 28 | |
| 2438688215 | dispersion forces (London dispersion forces) | dispersion is an intermolecular attraction force that exists between all molecules. These forces are the result of the movement of electrons which cause slight polar moments. Generally very weak, when their molecular mass increases, so does their strength | 29 | |
| 2438693835 | dissociation | breaking down of a compound into its components to form ions from an ionic substance | 30 | |
| 2438694965 | double bond | when an atom is bonded to another atom by two sets of electron pairs | 31 | |
| 2438697803 | effusion | movement of gas molecules through a small opening | 32 | |
| 2438698558 | electrochemical cell | gives an electric current with a steady voltage as a result of an electron transfer reaction | 33 | |
| 2438700118 | electrodes | device that moves electrons into or out of a solution by conduction | 34 | |
| 2438701164 | electrolysis | changing the chemical structure of a compound using electrical energy | 35 | |
| 2438702193 | electromagnetic spectrum | complete range of wavelengths which light can have. These include infrared, ultraviolet and all other types of radiation as well as visible light | 36 | |
| 2438704503 | electrong | one of the parts of an atom having a negative charge. Indivisible particle with a charge of -1 | 37 | |
| 2438705716 | electronegativity | measure of a substance's ability to attract electrons | 38 | |
| 2438706972 | electrostatic forces | forces between charged objects | 39 | |
| 2438707587 | element | substance consisting of only one type of atom | 40 | |
| 2438708539 | empirical formula | formula showing the simplest ratio of elements in a compound | 41 | |
| 2438709327 | endothermic | process that absorbs heat from its surroundings as the reaction proceeds | 42 | |
| 2438712085 | energy | ability to do work | 43 | |
| 2438712087 | enthalpy | change in heat at constant pressure | 44 | |
| 2438712956 | entropy | measure of the disorder of a system | 45 | |
| 2438740282 | equilibrium | when the reactants and products are in a constant ratio. The forward reaction and the reverse reactions occur at the same rate when a system is in this state | 46 | |
| 2438744591 | equilibrium constant | value that expresses how far the reaction proceeds before reaching equilibrium. A small number means that equilibrium is towards the reactants side while a large number means that the equilibrium is towards the product side | 47 | |
| 2438747793 | equilibrium expression | the expression giving the ratio between the products and reactants. It is equal to the concentration of each product raised to its coefficient in a balanced chemical equation and multiplied together, divided by the concentration of the product of reactants to the power of their coefficients | 48 | |
| 2438751799 | equivalence point | occurs when the moles of acid equal the moles of base in a solution | 49 | |
| 2438752796 | exothermic | process that gives off heat to the environment | 50 | |
| 2438794654 | frequency | number of events in a given unit of time. When describing a moving wave, means the number of peaks which would pass a stationary point in a given amount of time | 51 | |
| 2438796674 | Geiger counter | instrument that measures radiation output | 52 | |
| 2438797371 | Gibb's free energy | the energy of a system that is available to do work at a constant temperature and pressure | 53 | |
| 2438798542 | Graham's law | the rate of diffusion of a gas is inversely proportional to the square root of its molar mass | 54 | |
| 2438820466 | half life | the amount of time it takes for half an initial amount to disintegrate | 55 | |
| 2438822345 | Heisenberg uncertainty principle | the principle states that it is not possible to know a particle's location and momentum precisely at any time | 56 | |
| 2438825708 | hydrogen bonding | strong type of intermolecular dipole-dipole attraction. Occurs between hydrogen and F, O or N | 57 | |
| 2438826741 | hydrolysis | the reactions of cations with water to produce a weak base or of anions to produce a weak acid | 58 | |
| 2438827701 | ideal gas law |  | 59 | |
| 2438829412 | intermolecular forces | forces between molecules | 60 | |
| 2438830033 | intramolecular forces | forces within molecules. Forces caused by the attraction and repulsion of charged particles | 61 | |
| 2438830884 | ion | removing or adding electrons to an atom creates an ... (a charged object very similar to an attom) | 62 | |
| 2438832278 | ionic bond | when two oppositely charged atoms share at least one pair of electrons but the electrons spend more time near one of the atoms than the other | 63 | |
| 2438834185 | ionization energy | energy required to remove an electron from a specific atom | 64 | |
| 2438834946 | isotopes | elements with the same number of protons but have different numbers of neutrons, and thus different masses | 65 | |
| 2438835790 | Kelvin | The SI unit of temperature. It is temperature in degrees Celsius plus 273.15 | 66 | |
| 2438836720 | kinetic energy | energy an object has because of its mass and velocity. Objects that are not moving do not have this. | 67 | |
| 2438838464 | Le Chatlier's Principle | states that a system at equilibrium will oppose any change in the equilibrium conditions | 68 | |
| 2438839471 | Lewis structures | a way of representing molecular structures based on valence electrons | 69 | |
| 2438840449 | limiting reagent | the reactant that will be exhausted first | 70 | |
| 2438841082 | mass number | the number of protons and neutrons in an atom | 71 | |
| 2438841787 | mixture | composed of two or more substances, but each keeps its original properties | 72 | |
| 2438842500 | molality | the number of moles of solute (the material dissolved) per kilogram of solvent (what the solute is dissolved in) | 73 | |
| 2438843630 | molar | a term expressing molarity, the number of moles of solute per liters of solution | 74 | |
| 2438844541 | molarity | the number of moles of solute (the material dissolved) per liter of solution. used to express the concentration of a solution | 75 | |
| 2438846069 | mole | a collection of 6.022 * 10 to the 23 power number of objects. Usually used to mean molecules | 76 | |
| 2438848301 | molecular formula | shows the number of atoms of each element present in a molecule | 77 | |
| 2438849694 | molecular geometry (VSEPR) | shape of a molecule, based on the relative position of the atoms | 78 | |
| 2438852225 | molecular mass | the combined mass (as given on the periodic table) of all the elements in a compound | 79 | |
| 2438853486 | molecule | two or more atoms chemically combined | 80 | |
| 2438854288 | mole fraction | the number of moles of a particular substance expressed as a fraction of the total number of moles | 81 | |
| 2438855433 | neutral | an object that does not have a positive or negative charge | 82 | |
| 2438855976 | neutron | a particle found in the nucleus of an atom. It is almost identical in mass to a proton, but carries no electrical charge | 83 | |
| 2438857980 | nm | abbreviation for nanometers. A nanometer is equal to 10 to the -9 power meters | 84 | |
| 2438861044 | nucleus | the central part of an atom that contains the protons and neutrons. Plural=nuclei | 85 | |
| 2438862114 | octet | In Lewis structures, the goal is to make almost all atoms have this structure. This means they will have access to (8) electrons regularly, even if they do have to share some of them | 86 | |
| 2438864684 | orbitals | an energy state in the atomic model which describes where an element will likely be | 87 | |
| 2438865790 | oxidation number | a number assigned to each atom to help keep track of the electrons during a redox-reaction | 88 | |
| 2438867781 | oxidation-reduction-reaction | a reactions involving the transfer of electrons | 89 | |
| 2438868387 | parent isotopes | an element that undergoes nuclear decay | 90 | |
| 2438869459 | partial pressure | the pressure exerted by a certain gas in a mixture | 91 | |
| 2438869967 | particle | small portion of matter | 92 | |
| 2438870418 | percent composition | expresses the mass ratio between different elements in a compound | 93 | |
| 2438871897 | periodic table | grouping of the known elements by their number of protons. There are many other trends such as size of elements and electronegativity that are easily expressed in terms of the periodic table | 94 | |
| 2438874309 | pH | measures the acidity of a solution. It is the negative log of the concentration of the hydrogen ions in a substance | 95 | |
| 2438875069 | photon | massless packet of energy, which behaves like both a wave and a particle | 96 | |
| 2438875773 | physical property | a property that can be measured without changing the chemical composition of a substance | 97 | |
| 2438880603 | Planck | What is h? |  | 98 |
| 2438881741 | Planck | He contributed to the understanding of the | 99 | |
| 2471630916 | pOH | Measures the basicity of a solution. It is the negative log of the concentration of the hydroxide ions | 100 | |
| 2471632534 | polar molecules | Molecule with a partial charge | 101 | |
| 2471633873 | potential energy | The energy an object has because of its composition or position | 102 | |
| 2471636198 | pressure | Force per unit area | 103 | |
| 2471637711 | principal quantum number (n) | The number related to the amount of energy an electron has and therefore describing which shell the electron is in | 104 | |
| 2471639985 | products | The compounds that are formed when a reaction goes to completion | 105 | |
| 2471640832 | proportion | An equality between two ratios | 106 | |
| 2471641938 | proton | Particle found in a nucleus with a positive charge. Number of these gives the atomic number | 107 | |
| 2471643719 | quantum | Something that comes in discrete units | 108 | |
| 2471645389 | quantum numbers | Set of numbers used to completely describe an electron | 109 | |
| 2471646381 | radiant energy | Energy which is transmitted away from its source, for example, energy that is emitted when electrons transition down one level to another | 110 | |
| 2471649197 | radiation | Energy in the form of photons | 111 | |
| 2471650091 | radioactive | Substance containing an element which decays | 112 | |
| 2471651508 | ratio | The relative size of two quantities expressed as the quotient of one divided by the other; a:b or a/b | 113 | |
| 2471656023 | reactants | Substances initially present in a chemical reaction | 114 | |
| 2471657396 | reduction reaction | A reaction in which a substance gains at least one electron | 115 | |
| 2471659489 | salts | Ionic compounds that can be formed by replacing one or more of the hydrogen ions of an acid with another positive ion | 116 | |
| 2471661858 | shells (orbitals) | Where the electrons generally are; they are composed of four types of sub...; s, p, d and f | 117 | |
| 2471664164 | single bond | When an electron pair is shared by two atoms | 118 | |
| 2471665160 | SI Unit | Standards for Systeme International d'Unites, an international system which establishes a uniform set of measurement units | 119 | |
| 2471667969 | solute | The substance (solid, liquid or gas) dissolved in a solution, for example, the salt in saltwater | 120 | |
| 2471669330 | solution | Mixture of a solid and a liquid where the solid never settles out, for example, saltwater | 121 | |
| 2471670787 | solvent | Liquid in which something is dissolved, for example the water in saltwater | 122 | |
| 2471672035 | specific heat | The amount of heat it takes for a substance to be raised by one degree Celsius | 123 | |
| 2471674473 | spontaneous reaction | A reaction that will proceed without any outside energy | 124 | |
| 2471676634 | states of matter | Solid, liquid, gas and plasma. Plasma is a "soup" of disassociated nuclei and electrons, normally found only in stellar objects | 125 | |
| 2471678894 | stoichiometry | The study of the relationships between amounts of products and reactants | 126 | |
| 2471680670 | STP | Standard Temperature and Pressure. 0 degrees Celsius and 1 atm | 127 | |
| 2471683254 | subshell (suborbital) | One part of a level, each of which can hold different numbers of electrons | 128 | |
| 2471685416 | thermodynamics | The study of temperature, pressure, volume and energy flow in chemical reactions | 129 | |
| 2471687980 | titration | The process used to take a solution of unknown concentration with a solution of a known concentration for the purpose of finding out more about the unknown solution | 130 | |
| 2471690220 | valence electrons | The electrons in the outermost shell of an atom | 131 | |
| 2471690803 | van der Waals equations | An equation for non-ideal gases that accounts for intermolecular attraction and the volumes occupied by gas molecules | 132 | |
| 2471692863 | velocity | Speed of an object; the change in position over time | 133 | |
| 2471694204 | volume | Measures the size of an object using length measurements in three dimensions | 134 | |
| 2471695561 | wave | A signal which propagates through space | 135 | |
| 2471698832 | wavelength | On a periodic curve, the length between two consecutive troughs (low points) or peaks (high points) | 136 | |
| 2471700760 | weak acid | Substances capable of donating hydrogen but do not completely ionize in solution | 137 | |
| 2471702319 | weak bases | Substances capable of accepting hydrogen but do not completely ionize in solution | 138 | |
| 2471704900 | work | Expression of the movement of an object against some force | 139 |
