Chapter 6:
Chemical Reactions and Equations
Practice Test
1.
A solid that forms from a solution during a chemical reaction is called a ______________.
a.
reactant
b.
formate
c.
substrate
d.
precipitate
Hint
2.
The substances to the left of the reaction arrow are called _______________.
a.
gases
b.
precipitates
c.
reactants
d.
products
Hint
3.
Changes in an equilibrium system can be described according to _____________ principle.
a.
Dalton's
b.
Le Chatelier's
c.
Rutherford's
d.
Boyle's
Hint
4.
A ____________ reaction is one in which one element takes the place of another in a compound.
a.
synthesis
b.
single displacement
c.
double displacement
d.
decomposition
Hint
5.
A ____________ reaction is one in which a compound breaks down into two or more simpler substances.
a.
synthesis
b.
replacement
c.
decomposition
d.
photosynthesis
Hint
6.
What type of reaction is represented by the equation Pb(NO
3
)
2
+ K
2
CrO
4
PbCrO
4
+ 2KNO
3
?
a.
synthesis
b.
double displacement
c.
single displacement
d.
decomposition
Hint
7.
A number placed before a formula to indicate how many units of the substance are involved in a chemical reaction is called a ____________.
a.
subscript
b.
substrate
c.
coefficient
d.
superscript
Hint
8.
A reaction between magnesium chloride and silver nitrate yields magnesium nitrate and silver chloride. What is the coefficient for magnesium nitrate in the balanced equation for the reaction?
a.
2
b.
1
c.
3
d.
4
Hint
9.
This type of chemical reaction has energy written as a product.
a.
endothermic
b.
light-absorbing
c.
exothermic
d.
energy-absorbing
Hint
10.
Changes in energy, color, and odor are indications that a __________ has taken place.
a. displacement reaction
b. separation reaction
c. precipitation reaction
d. chemical reaction
Hint
11.
What type of reaction is represented by the equation CH
4
+ 2O
2
CO
2
+ 2H
2
O?
a.
synthesis
b.
double displacement
c.
decomposition
d.
combustion
Hint
12.
Adding reactants causes an equilbrium to ______________.
a.
shift to the right
b.
shift in both directions simultaneously
c.
remain unchanged
d.
shift to the left
Hint
13.
What is the coefficient for NaOH in the equation that describes its reaction with CO
2
to produce Na
2
CO
3
and H
2
O?
a.
4
b.
1
c.
3
d.
2
Hint
14.
A substance that increases the rate of a chemical reaction without being permanently changed or consumed is called ______________.
a.
a reactant
b.
a product
c.
a catalyst
d.
an equilibrate
Hint
15.
A description of a chemical reaction that includes the names of all reactants and products, but not the formulas, is called a ___________________.
a.
skeleton equation
b.
word equation
c.
balanced equation
d.
chemical equation
Hint
16.
The positive and negative portions of two ionic compounds are interchanged in this type of reaction.
a.
synthesis
b.
decomposition
c.
double displacement
d.
single displacement
Hint
17.
What type of reaction is represented by the equation 2Fe + 3Cl
2
2FeCl
3
?
a.
synthesis
b.
single displacement
c.
combustion
d.
decomposition
Hint
18.
Activation energy is the energy required to _________________.
a.
stop a reaction
b.
initiate a reaction
c.
slow down a reaction
d.
speed up a reaction
Hint
19.
Reactions that can occur in either direction are said to be ____________.
a.
limited
b.
backward
c.
reversible
d.
forward
Hint
20.
What is the missing product in this balanced equation describing the decomposition of water? 2H
2
O(l) + energy
O
2
(g) +
a.
H
2
O(g)
b.
H
2
(g)
c.
energy
d.
2H
2
(g)
Hint
