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Mass Relationships in Chemical Reactions Practice QuestionsG

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Chemistry
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Stoichiometry
Chemistry
Chemical properties
Mass
Chemical formulas
Yield
Atomic mass
Mole
Limiting reagent
Conversion
Mass fraction
Molar mass

Atomic mass mass of an atom in atomic mass units An atomic mass unit is equal to? One twelth the mass of one carbon-12 atom The average atomic mass is equal to? atomic mass on the periodic table Isotopes are atoms of the same element with a different number of ___ and so they have different ___ 1) neutron 2) masses Mole Is a counter and relates to mass.* It is similar to a dozen. *It can count the number atoms/molecules/particles. Molar Mass *is the mass of one mole of the substance. *g/mol = atomic mass of the element *molar mass of an element contains mols of atoms Avogadro's number particles/atoms/molecueles > moles *6.022x10^23 Percent Composition Mass of element/ mass of compound x 100 Tell how much an element contributes to the mass of the compound

AP Chemistry Zumdahl 7E Chapter 12 Notes

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Chemistry
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Chemical kinetics
Order of reaction
Reaction rate
Rate equation
Molecularity
Rate-determining step
Chemical reaction
Reaction mechanism
Catalysis
Activation energy
Conversion
Yield

1 Chapter 12 - Chemical Kinetics 12.1 Reaction Rates A. Chemical kinetics 1. Study of the speed with which reactants are converted to products B. Reaction Rate 1. The change in concentration of a reactant or product per unit of time [ ] t A tt ttimeatAofionconcentratttimeatAofionconcentratRate D D=- -= 12 12 a. Rates decrease with time b. It is customary to express reaction rates as positive values c. Instantaneous rate can be determined by finding the slope of a line tangent to a point representing a particular time C. Decomposition of NO2 2NO2(g) ? 2NO(g) + O2(g) Rate of consumption of NO2 = rate of production of NO = 2(rate of production of O2) [ ]t NO D D- 2 = [ ] t NO D D = [ ] ? ?

AP Chemistry Zumdahl 7E Chapter 3 Notes

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Chemistry
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Stoichiometry
Chemical properties
Mass
Amount of substance
Chemical reactions
Yield
Mole
Limiting reagent
Atomic mass
Empirical formula
Molar mass
Chemistry

AP Chemistry A. Allan Chapter 3 Notes - Stoichiometry 3.1 Atomic Masses A. C-12, the Relative Standard 1. C-12 is assigned a mass of exactly 12 atomic mass units (amu) 2. Masses of all elements are determined in comparison to the carbon - 12 atom (12C) the most common isotope of carbon 3. Comparisons are made using a mass spectrometer B. Atomic Mass (Average atomic mass, atomic weight) 1. Atomic masses are the average of the naturally occurring isotopes of an element 2. Atomic mass does not represent the mass of any actual atom 3. Atomic mass can be used to "weigh out" large numbers of atoms 3.2 The Mole A. Avogadro's number 1. 6.022 x 1023 units = 1 mole 2. Named in honor of Avogadro (he did NOT discover it) B. Measuring moles

Principles of Chemistry Chapter 4

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Chemistry
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Stoichiometry
Chemical reactions
Chemical reaction engineering
Chemistry
Yield
Limiting reagent
Air–fuel ratio
Mole
Chemical reaction
Molar mass
Chemical synthesis
Conversion

Chapter 4: Stoichiometry Section 4.2: Fundamentals of Stoichiometry Monday, September 15, 2014 2:32 PM Stoichiometry - study of relationships between quantities of reactants and products in chem reactions ? Obtaining Ratios from Balanced Equations ? -from the coefficients in the equation, all atoms are in ratios with one another Equation: CH4 + 2O2 = CO2 + 2H2O Ex: 1 mol CH4 : 2 mol O2 AND 1 mol CH4 : 1 mol CO2 **these are called "mole ratios" -frequently written as fractions -"molar mass ratios" relate molecular mass and molar mass ? ? This is a typical approach to solving reaction stoichiometry! ? Keep in mind the units for your final answer (in this case, grams of water) -also, use unit cancellation ? ?

Bob Jones PPT Notes -- Chapter 9b

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Chemistry
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Chemistry
Chemical reactions
Stoichiometry
Limiting reagent
Mole
Zinc
Neutralization
water
Yield

Stoichiometry 1 Literally means ?to measure the elements? Answers questions like?How much is needed?? and ?How much is produced?? Stoichiometry Unit analysis 365 days 1 year 24 hrs 1 day 3600 sec. 1 hr 1 year How many seconds are in a year? = 31,536,000 sec. Unit analysis We use unit analysis in stoichiometric problems also. Grams-to-moles conversion factors are found in the periodic table. Unit analysis Mole-to-mole conversion factors are found in the coefficients of the equation. A mole-to-mole conversion changes moles of one substance to moles of another substance. ?Skeleton Equation?

Principals of Engineering final exam

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Physics
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Mechanical engineering
Physics
Mechanics
kinematics
Machines
Elasticity
Deformation
Mechanical advantage
Gear ratio
Wheel and axle
Yield
Creep

Principles Of Engineering? Final Examination Part A Spring 2007 Student Name: ___________________________________ Date: _____________________ Class Period: _____________ Total Points: ____________/40 Converted Score: ____________/50 Directions: Circle the letter of the response that best answers the question or completes the statement. Then fill in the Part A answer sheet. Reference Tables are available at the end of the document. 1. An engineer begins the process of brainstorming potential solutions to a design problem. One of the requirements of the final product is that it be biodegradable. This restriction would be referred to as a ___________. A. matrix C. constraint B. holdover D. design brief 2.
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