Name____________________________________
Date__________________________Pd________
Reviewing Stoichiometry Vocabulary
Use the following terms to complete the statements. Some terms will be used more than once.
actual yield
excess reactant
limiting reactant
percent yield
mole ratio
stoichiometry
theoretical yield
1. The reactant that limits the extent of the reaction is called the __________________.
2. The amount of product actually produced by a chemical reaction is called
the _______________.
3. A(n) __________________ is a ratio between the number of moles of any two substances in a balanced chemical equation.
4. A(n) __________________ is a reactant that has a portion remaining after the
reaction has stopped.
5. The ___________________ is the maximum amount of product that can be
produced from a given amount of reactant.
6. The study of the quantitative relationships among the amounts of reactants used and
the amounts of products formed by a chemical reaction is called
____________________.
7. The ratio of the actual yield to the theoretical yield expressed as a percent is called
the ______________________
8. The amount of product formed during a reaction depends on the
__________________.
9. A chemical reaction rarely produces the ___________________ of the product.
10. Chemists sometimes use ______________________ to speed up a chemical
reaction.
Name____________________________________
Date__________________________Pd________
Understanding Main Ideas (Part A)
Circle the letter of the choice that best completes the statement or answers the
question.
1. Stoichiometry is based on the law of conservation of
a. charge.
b. mass.
c. reactants.
d. volume.
2. In a balanced chemical equation, the numbers of individual particles and the
numbers of moles of particles are represented by the
a. chemical symbols.
c. molar masses.
b. coefficients.
d. subscripts.
3. Mole ratios for a reaction are obtained from the
a. balanced chemical equation.
b. molar masses.
c. periodic table.
d. total mass of products.
4. In the decomposition reaction of compound AB into substances A and B, what is the
number of mole ratios?
a. 1
b. 3
c. 6
d. 9
5. Calculating the mass of a reactant and product from the number of moles of another
product or reactant in a chemical equation is an example of a
a. mass-to-mass conversion.
c. mole-to-mass conversion.
b. mass-to-mole conversion.
d. mole-to-mole conversion.
6. Limiting a reactant is often accomplished by
a. producing excess product.
b. overcoming conservation of mass.
c. slowing down a chemical reaction.
d. using an excess of another reactant.
7. In a reaction, substances A and B form substance C. If the actual mole ratio of
substance B to substance A is less than the balanced equation mole ratio of
substance B to substance A, substance B is the
a. actual yield.
b. excess reactant.
c. limiting reactant.
d. product.
8. Percent yield of a product is a measure of a reaction’s
a. efficiency.
b. heat production.
c. rate.
d. spontaneity.
9. The actual yield of a product is
a. a negative value.
b. independent of the reactants.
c. the same as its theoretical yield.
d. measured experimentally.
10. The most important industrial chemical in the world is
a. carbon dioxide.
b. oxygen.
c. petroleum.
d. sulfuric acid.