Modified True/False
Indicate
whether the sentence or statement is true or false. If false, change the identified word or
phrase to make the sentence or statement true.
|
|
|
1.
|
An
excess reagent is not completely consumed in a chemical reaction.
____________________
|
|
|
2.
|
The
amount of products formed in a chemical reaction depends on the amount of excess reagent
available. ______________________________
|
|
|
3.
|
During a chemical reaction, the limiting reagent is used up before all the
excess reagent is consumed. ____________________
|
|
|
4.
|
Low
percentage yields may occur because most reactions are reversible.
____________________
|
|
|
5.
|
Increasing the number of steps in an experimental design usually increases the
yield of product in a chemical reaction. ____________________
|
|
|
6.
|
The
actual yield of a chemical reaction is calculated on the basis of a balanced chemical
equation. ________________________________________
|
Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
|
|
|
7.
|
Which
of the following is not a cause of low percentage yield in a chemical reaction? a. | splattering
during a heating procedure | c. | vanishing
products | b. | impurities in reagents | d. | side reactions | | | | |
|
|
|
8.
|
For
the following reaction, what amount of carbon dioxide can form when 2 mol
C2H2(g) is mixed with 7 mol O2(g)?
2
C2H2(g) + 5 O2(g) ® 4 CO2(g) + 2
H2O(g) a. | 1 mol | c. | 3 mol | b. | 2
mol | d. | 4
mol | | | | |
|
|
|
9.
|
Which
entity is the limiting reagent in the following reaction, if 2 mol methane reacts with 2 mol
oxygen?
CH4(g) + 2 O2(g) ®
CO2(g) + 2 H2O(g) a. | CH4(g) | c. | CO2(g) | b. | O2(g) | d. | H2O(g) | | | | |
|
Completion
Complete each sentence or
statement.
|
|
|
10.
|
The
amount of product that is predicted by a balanced chemical equation is called the
____________________ yield.
|
|
|
11.
|
The
amount of product that is actually produced in a chemical reaction is called the ____________________
yield.
|
|
|
12.
|
Often, the ____________________ yield in a chemical reaction is less than the
____________________ yield
|