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
|