Name: ____________________________________
Class: _____________
Date: _____________
Self Assessment: Oxidation Reduction Reactions
1. What agent is losing electrons in the following equation?
Zn + CuBr2 ZnBr2 + Cu
a) O
b) Br
c) Cu
d) Zn
2. Reduction is a reaction in which _____.
a) a substance's oxidation number increases
b) the number of atoms of a substance decreases
c) a substance gains electrons
d) a substance loses an oxygen atom
3. What is the oxidation number of an uncombined element?
a) 1+
b) 0
c) 2–
d) 1–
4. How does an oxidation reduction reaction demonstrate the conservation of mass?
a) A reducing agent can achieve a stable octet by losing electrons.
b) The number of protons in the products equals that of the reactants.
c) Electrons that are lost by one agent are gained by another.
d) An oxidizing agent can lose oxygen atoms to the environment.
5. Which of the following is an oxidation reduction reaction?
a) MgO + H2 CO3 b) Cl2 + 2NaBr MgCO3 + H2 O
2NaCl + Br2
c) 2AgNO3 + K2 SO4 d) NaOH + HCl PAGE 1
Ag2 SO4 + 2KNO3
NaCl + H2 O
Name: ____________________________________
Class: _____________
Date: _____________
Self Assessment: Oxidation Reduction Reactions
6. Nitrogen reacts with lithium to form Li3 N according to the following equation:
6Li (s) + N2 (g) 2Li3 N (s)
Nitrogen acts as the oxidizing agent. What can you conclude about nitrogen in this process?
a) Nitrogen gains electrons.
b) Nitrogen is oxidized.
c) Nitrogen reacts with oxygen.
d) Nitrogen loses electrons.
7. How does the oxidation number for iron change in the following equation?
3C + 2Fe2 O3 4Fe + 3CO2
a) It goes from 3– to 0.
b) It goes from 0 to 3+.
c) It goes from 0 to 3–.
d) It goes from 3+ to 0.
8. Which substance is the reducing agent in the following process?
H2 (g) + CuO (s) Cu (s) + H2 O (l)
a) Cu (s)
b) CuO (s)
c) H2 (g)
d) H2 O (l)
9. One example of an oxidation reduction reaction is the burning of carbon, C, in the presence of oxygen gas,
O2 , as in the following equation:
C (s) + O2 (g) CO2 (g)
If the oxidation number of each oxygen atom in the product is 2–, what is the oxidation number of carbon in
the product?
a) 4+
b) 0
c) 4–
d) 2+
PAGE 2
Name: ____________________________________
Class: _____________
Date: _____________
Self Assessment: Oxidation Reduction Reactions
10. Which of the following describes what happens to an oxidizing agent in an oxidation reduction reaction?
a) Its oxidation number increases.
b) It is oxidized.
c) It receives an oxygen atom.
d) It gains electrons.
PAGE 3
ANSWER KEY
1. d
2. c
3. b
4. c
5. b
6. a
ANSWER KEY Page 1
7. d
8. c
9. a
10. d