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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 = [ ] ? ?

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
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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 ? ?
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