Name: ________________________________________________ Date: ___________________ Pd:______
Unit 7 Chemical Reactions
PRACTICE TEST/ REVIEW
_____1. A chemical reaction is a process in which
a. products change into reactants
c. substances can change state
b. the law of conservation of mass applies
d. all of these
_____2. During a chemical reaction,
a. new elements are produced
c. atoms are destroyed
b. atoms are rearranged
d. elements are destroyed
_____3. An equation is balanced by
a. changing subscripts
c. erasing elements as necessary
b. adding coefficients
d. adding elements as necessary
_____4. What are the reactants in the following chemical equation:
Zn + CuSO4  ZnSO4+ Cu
a. zinc and copper
c. zinc and copper (II) sulfate
b. zinc sulfate and copper
d. only zinc
_____5. What are the products in the above equation?
a. zinc and copper
c. zinc and copper (II) sulfate
b. zinc sulfate and copper
d. only zinc
_____6. The breaking down of a substance into two or simpler substances is_____
a. Displacement
b. Synthesis
c. Decomposition
d. Double displacement
_____7. Each substance to the right of the arrow in a chemical equation is a(n)
a. Reactant
b. Catalyst
c. Product
d. Inhibitor
_____8. According to the law of conservation of mass, if two atoms of hydrogen are used as a reactant, how
many atoms of hydrogen must be part of the product?
a. 4
b. 2
c. 1
d. 0
_____9. What type of reaction is shown in the following chemical equation, NH4Cl  NH3 + HCl?
a. Displacement
b. Synthesis
Chemical Reactions Pre-test
c. Decomposition
d. Double displacement
1
Chemistry
_____10. When most chemical reactions take place, some ____ in the reactants must be broken, a process that
requires energy.
a. Chemical bonds
b. Products
c. Precipitate
d. Catalyst
_____11. A(n) _____ chemical equation has the same number of atoms of each element on each side of
equation.
a. Complex
b. Simple
c. Unbalanced
d. Balanced
_____12. A chemical reaction in which two or more substances combine to form another substance
a. Synthesis
b. Reactant
c. Decomposition
d. Product
Short Answer
Classify the reaction according to the type it is. Put that answer in the blank. Then add coefficients to balance
the reaction when necessary.
H2SO4
_____________________ 13.
Zn +
_____________________ 14.
H2CO3 
_____________________15.
CaCO3 +
HCl 
_____________________16.
AgNO3 +
Zn 
_____________________ 17.
C3H8 +
_____________________ 18.
C2H5OH +
Chemical Reactions Pre-test
CO2 +
O2 
O2 
ZnSO4 +
H2
H2O
CaCl2 +
H2CO3
Zn(NO3)2 +
CO2 +
CO2 +
2
Ag
H2O
H2O
Chemistry
Write a balanced equation for each of the following reactions:
19. Magnesium chloride is the product of a reaction between magnesium and chlorine.
20. Copper (II) hydroxide and potassium sulfate are produced when potassium hydroxide reacts with copper(II)
sulfate.
21. Sodium Hydroxide and Iron (III) Chloride react to produce Sodium Chloride and Iron (III) Hydroxide.
Based on the type of reaction given, predict and then balance the following equations:
22. (Decomposition)
KClO3  ?
Balanced Chemical Equation: __________________________________________________________
23. (Double Replacement)
CaCl2 +
Na2CO3  ?
Balanced Chemical Equation: __________________________________________________________
Chemical Reactions Pre-test
3
Chemistry
24. (Synthesis)
Sodium and Oxygen ?
Balanced Chemical Equation: __________________________________________________________
25. (Single Replacement)
Iron (II) Chromate + Aluminum ?
Balanced Chemical Equation: __________________________________________________________
26. (Combustion)
C4H10 + O2  ?
Balanced Chemical Equation: __________________________________________________________
STUDY:






Notes (Powerpoint)
Worksheets
Reactions lab
Balancing Equations
Types of Reactions
Nomenclature (covalent, ionic, acids)
Chemical Reactions Pre-test
4
Chemistry