Chemistry Practice Test
Name _____________________________
Unit 4: Chapter 8 Concepts (Chemical Equations)
Multiple Choice: Write the letter of the term or phase that best completes each statement.
D ____ 1. The chemicals mixed together at the beginning of a reaction are called the
(Hint: these chemicals are found on the left side of the arrow in the equation)
a. coefficients
b. subscripts
c. products
d. reactants
C _____ 2. The new substances formed in a chemical reaction are referred to as
a. catalysts.
b. intermediates.
c. products.
d. reactants.
A_____ 3. Numbers placed in front of formulas in an equation are called _____ .
a. coefficients
b. subscripts
c. products
d. reactants
B _____ 4. The symbol that indicates that a substance is “dissolved in water” is _____ .
a. (l)
b. (aq)
c. (H2O)
d. (w)
Use the following choices for the next 5 questions:
Match the general equation with its name:
a.
b.
c.
d.
e.
BC 

B

CD 
O2

A
+
AB
A
+
AB
+
C?H? +
B
A
AB
CB
CO2
+
+
AC
B
+
+
AD
H2O +
energy
C _____ 5. Direct combination
B _____ 6. Decomposition
A_____ 7. Single-Replacement
D ____ 8. Double Replacement
E _____ 9. Combustion
Use the following choices for the next 5 questions:
a.
b.
c.
d.
e.
NaCl(aq)
3K
CH4
3 H2
+
+
+
2 KBr
+
AgNO3(aq) 
FeCl3

O2


N2

AgCl(s) +
3 KCl +
CO2 +
2K
+
2 NH3
NaNO3(aq)
Fe
H2O
Br2
A_____ 10. Which of the following is a double replacement reaction?
B _____ 11. Which of the following is a single replacement reaction?
E _____ 12. Which of the following is a synthesis (direct combination) reaction?
C _____ 13. Which of the following is a combustion reaction?
D ____ 14. Which of the following is a decomposition reaction?
Identify which of the following equations are balanced. Write the letter to the left of the equation.
Use the following choices: A) Unbalanced
B) Balanced
A_______ 15.
2Na
+
O2

2Na2O
B _______ 16.
2Cu
+
S

Cu2S
A_______ 17.
2Fe
+
3O2

Fe2O3
A_______ 18.
2Na
+
H2O

2NaOH
+
H2
B _______ 19.
Cu
+
2H2SO4

2H2O
+
CuSO4
B _______ 20.
Zn
+
2HCl

ZnCl2
+
H2
B _______ 21.
2H2
+
O2

2H2O
B _______ 22.
Al2 (SO4) 3 +
3CaCl2

2AlCl3
+
3CaSO4
A_______ 23.
C8H18
12 O2

8 CO2
+
9 H2O
+
+
SO2
+
Energy
Balance the following equations and choose the coefficients that match the correct balanced equation.
A_____ 24. ___K2CO3
a. 1,1,1,1
+
___CaSO4

b. 1,2,1,2
___CaCO3 +
c. 2,2,2,2
C _____ 25. ___ KClO3
a. 1,1,1

___KCl
+
b. 2,2,1
___O2
c. 2,2,3
B _____ 26. What is the missing coefficient in the equation:
a. 1
b. 2
c. 3
___K2SO4
d. 0,0,0,0
d. 2,2,6
? NO + O2  2 NO2
D ____ 27. What is the missing coefficient in the equation: C3H8 +
a. 2
b. 3
c. 4
d. 4
? O2  3 CO2 + 4 H2O
d. 5
B _____ 28. In the following equation, how many moles of sodium are there?
2 Na +
a. 1.2 x 1023
Cl2
b. 2 moles

2 NaCl
c. 46 grams
d. 1 mole
e. 6.02 x 1023
C _____ 29. Which of the following will replace iron FeO? (Hint: Use activity series table)
a. calcium
b. magnesium
c. both a and b
d. neither a nor b
A_____ 30. Which of the following will replace magnesium in MgO?
a. calcium
b. copper
c. both a and b
d. neither a nor b
B _____ 31. The balanced equation for the reaction of hydrochloric acid and oxygen to produce chlorine and
water is:
a. 2 HCl +
O2

Cl2
+
H2O.
b. 4 HCl +
O2

2 Cl2
+
2 H2O.
c. 2 HCl +
O2

2 Cl2
+
H2O.
d. 2 HCl +
2O

2 Cl
+
H2O.
The next two questions refer to the figure below, which represents the molecules involved in a reaction.
Each lettered circle represents a kind of atom. One of the two product molecules is missing.
B
B
A
C
D

+
B
C
C
A
D
+
D
D ____ 32. What is the formula of the missing product molecule?
a. ABC
b. CBD2
c. CB2
d. CBD
B _____ 33. According to the Law of Conservation of Mass, if there are two D atoms as part of the
reactants, how many D atoms will be in the products?
a. one
b. two
c. three
d. four
B _____ 34. What is the correct equation for the combination of magnesium metal with chlorine gas?
a.
Mg
+
Cl

MgCl2
b. Mg
+
Cl2

MgCl2
c. MgCl2 
Mg
+
Cl2
D ____ 35. What signifies that a double replacement reaction just happened when mixing two aqueous
solutions?
a. water is produced
b. a precipitate is formed
c. gas is produced
d. all of these.
Use the choices below for the next three questions:
The reaction between solutions of potassium carbonate and calcium nitrate to form aqueous potassium
nitrate and the precipitate calcium carbonate can be represented in the following ways:
a. potassium carbonate
b.
K2CO3 (aq)
c.
2K+(aq) + CO3 2- (aq)
d.
Ca2+(aq)
+ calcium nitrate
+ Ca(NO3)2(aq)
+ Ca2+(aq) + 2NO3- (aq)
+
CO3 2- (aq)
 potassium nitrate + calcium carbonate

2KNO3(aq)
+
CaCO3(s)
 2K+ (aq) + 2NO3- (aq) +
CaCO3(s)

CaCO3(s)
C _____ 36. Which of the above is the Complete Ionic Equation?
D ____ 37. Which of the above is the Net Ionic Equation?
A_____ 38.
Which of the above is the Word Equation?
B _____ 39. Identify the spectator ion in the equation below:
Mg (s) + Cu2+(aq) + 2 NO3 - (aq) 
Cu (s) +
a. Mg (s)
b. 2 NO3 -
(aq)
c. Cu2+(aq)
Mg 2+(aq) + 2 NO3 d. Mg 2+(aq)
(aq)
e. Cu (s)
Predict the products for each of the reactions.
Choose the best answer and place the letter in the space provided. (use activity series to predict reaction)
+
Zn(NO3)2

+
+
Zn(NO3)2
Zn(NO3)2


Cu
+
Mg(NO3)2 
a. Cu
b. Cu
+
+
Mg(NO3)2 
Mg(NO3)2 
Mg
+
Zn(NO3)2

Mg
Mg
+
+
Zn(NO3)2
Zn(NO3)2


Zn
+
AgNO3

Zn
Zn
+
+
2AgNO3
AgNO3


B _____ 40.
Ag
a. 2Ag
b. Ag
B _____ 41.
A_____ 42.
a.
b.
A_____ 43.
a.
b.
Zn
+
No Reaction
2AgNO3
Mg
+
No Reaction
Cu(NO3)2
Zn
+
No Reaction
Mg(NO3)2
2Ag
+
No Reaction
Zn(NO3)2
Predict the formula that goes in the space on each equation before it is balanced.
B _____ 44.

NaClO3
a. O
B _____ 45.
Na
a. Cl
NaCl
b. O2
+
______
b. Cl2
+
c. O3

_________
d. ClO3
NaCl
c. Cl-1
d. Na