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- 1. Multiple ChoiceIn the reaction Zn + H2O --> ZnO2 + H2
which element, if any, is oxidized?ZincHydrogenOxygenNone - 2. Multiple ChoiceWhat substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3IronFluorineOxygen - 3. Multiple ChoiceIf in a reaction, copper is reduced; its number of electrons has:IncreasedDecreasedRemained ConstantVaries Randomly
- 4. Multiple ChoiceIf an atom loses electrons during a chemical reaction, the atom was:OxidizedReducedNeutralizedPrecipitated
- 5. Multiple Choice
What element is being Reduced?
N
H
O
S
- 6. Multiple ChoiceWhat is oxidation number of Cr in Cr2O72-?-2+2+6+12
- 7. Multiple ChoiceWhat is oxidation number of O in O2 ?0-2+1+2
- 8. Multiple Choice
WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:
Balance the following ACIDIC reactions using changing oxidation number method.
MnO4−(aq) + H+(aq) + I− (aq) → Mn2+(aq) + I2(s)
Water is a product of this reaction. What is the coefficient of water in the final balanced equation?
8
5
2
16
- 9. Multiple Choice
WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:
Balance the following reactions using changing oxidation number method.
MnO4−(aq) + H+(aq) + I− (aq) → Mn2+(aq) + I2(s)
How many electrons water compound produced in the reaction?
10
9
8
7
- 10. Multiple Choice
WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:
Consider the following REDOX reaction:
Cl2(g) → ClO−(aq) + Cl−(aq) (basic solution)
How many OH- molecules did you add to the reactant side of this reaction when balancing?
1
2
3
4
- 11. Multiple Choice
WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:
Consider the following REDOX reaction:
Cl2(g) → ClO−(aq) + Cl−(aq) (basic solution)
Which species is the result of oxidation?
Cl−
ClO−
- 12. Multiple Choice
What element is being Oxidized?
N
H
O
S
- 13. Multiple Choice
What element is being Reduced?
N
H
O
S
- 14. Multiple Choice
What are the coefficients when the equation is balanced?
2 + 3 --> 2 + 3 + 4
1 + 3 --> 1 + 3 + 2
2 + 4 --> 2 + 3 + 2
1 + 1 --> 1 + 1 + 1
- 15. Multiple Choice
What element is being Oxidized?
I
H
S
O
- 16. Multiple Choice
What are the coefficients when the equation is balanced?
1 + 1 + 1 --> 2 + 1 + 3
2 + 2 + 2 --> 4 + 2 + 3
1 + 2 + 1 --> 2 + 2 + 3
1 + 1 + 1 --> 1 + 1 + 1
- 17. Multiple Choice
What element is being reduced?
I
H
H
S
S
O
O
- 18. Multiple ChoiceWhat is oxidation number of Cr in Cr2O72-?-2+2+6+12
- 19. Multiple ChoiceWhat is oxidation number of H in CaH2?+1-10+2
- 20. Multiple ChoiceWhat is the oxidation number of N in NO2-1?-3+4-2+3
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