Chemical Reactions and Equations
Practice Test
1.
In a ______________ reaction, two or more substances react to form a single product.
a.
synthesis
b.
gas-producing
c.
double displacement
d.
decomposition
2.
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)
3.
What type of reaction is represented by the equation CH
4
+ 2O
2
CO
2
+ 2H
2
O?
a.
combustion
b.
synthesis
c.
double displacement
d.
decomposition
4.
A solid that forms from a solution during a chemical reaction is called a ______________.
a.
precipitate
b.
reactant
c.
formate
d.
substrate
5.
The substances to the left of the reaction arrow are called _______________.
a.
products
b.
gases
c.
precipitates
d.
reactants
6.
The substances to the right of the reaction arrow are called _______________.
a.
reactants
b.
gases
c.
products
d.
precipitates
7.
What type of reaction occurs when potassium and chlorine gas produce potassium chloride?
a.
synthesis
b.
decomposition
c.
combustion
d.
replacement
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.
4
d.
3
9.
Will the double displacement reaction NaOH + CaBr2 occur? If so, what is the product of the reaction?
a.
Yes, Ca(OH)2
b.
Yes, Br(OH)2
c.
No
d.
Yes, CaNa
10.
A substance that increases the rate of a chemical reaction without being permanently changed or consumed is called ______________.
a.
a product
b.
a catalyst
c.
a reactant
d.
an equilibrate
11.
Adding reactants causes an equilbrium to ______________.
a.
remain unchanged
b.
shift in both directions simultaneously
c.
shift to the right
d.
shift to the left
12.
Reactions that can occur in either direction are said to be ____________.
a.
limited
b.
reversible
c.
forward
d.
backward
13.
A system is said to be in ___________ when no net change in the amounts of reactants and products occurs.
a.
reverse
b.
equilibrium
c.
state
d.
dislacement
14.
________________ indicate a state of equilibrium in a chemical equation.
a.
A plus sign
b.
A minus sign
c.
Double reaction arrows
d.
An equal sign
15.
Which of the following single-replacement reactions will occur?
a.
Cl2(g) + HBr(aq) [arrow]
b.
Cu(s) + ZnCl2(aq) [arrow]
c.
Au(s) + Cu(NO3)2 (aq) [arrow]
d.
Br2(g) + HF(aq) [arrow]
16.
Adding energy to an equilibrium system that is exothermic to the right causes the system to ______________.
a.
shift to the left
b.
slow down
c.
remain unchanged
d.
shift to the right
17.
Changes in energy, color, and odor are indications that a _____________ has taken place.
a.
displacement reaction
b.
precipitation reaction
c.
chemical reaction
d.
separation reaction
18.
What type of reaction is represented by the equation Pb(NO
3
)
2
+ K
2
CrO
4
PbCrO
4
+ 2KNO
3
?
a.
single displacement
b.
double displacement
c.
synthesis
d.
decomposition
19.
Activation energy is the energy required to _________________.
a.
stop a reaction
b.
speed up a reaction
c.
initiate a reaction
d.
slow down a reaction
20.
A ____________ reaction is one in which one element takes the place of another in a compound.
a.
decomposition
b.
double displacement
c.
synthesis
d.
single displacement
21.
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
22.
A description of a chemical reaction that includes the names of all reactants and products, but not the formulas, is called a ___________________.
a.
word equation
b.
chemical equation
c.
skeleton equation
d.
balanced equation
23.
Changes in an equilibrium system can be described according to _____________ principle.
a.
Rutherford's
b.
Dalton's
c.
Boyle's
d.
Le Chatelier's
24.
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.
3
c.
1
d.
2
25.
This type of chemical reaction has energy written as a product.
a.
exothermic
b.
energy-absorbing
c.
endothermic
d.
light-absorbing
26.
What type of reaction is represented by the equation 2Fe + 3Cl
2
2FeCl
3
?
a.
synthesis
b.
combustion
c.
decomposition
d.
single displacement
27.
A ____________ reaction is one in which a compound breaks down into two or more simpler substances.
a.
photosynthesis
b.
synthesis
c.
decomposition
d.
replacement
28.
A number placed before a formula to indicate how many units of the substance are involved in a chemical reaction is called a ____________.
a.
superscript
b.
subscript
c.
substrate
d.
coefficient
