1. Give the oxidation number for the indicated element

S in H2S2O7

A) 4 B) 3C) 6D) -4E) -6

2. What is the oxidation number of Cl in ClO3

-

• A)4

• B)5

• C)1

• D)-1

• E) none of the above

3. In which of the following compounds does oxygen not have

an oxidation number of -2?• A) H2O

• B) H3O

• C) H2O2

• D) OH-

4. Electrochemistry is the study of….

• A) converting chemical energy to electrical energy

• B) converting electrical energy to chemical energy

• C) converting electrical energy to thermal energy

• D) converting potential energy to kinetic energy

• E) both A and B

5. What is a redox reaction?

• A) a reaction where one element is reduced and one is oxidized

• B) where elements disappear

• C) a way to cook food

• D) there is no such thing

6. What is the oxidation number of Cl in HClO4?

• A)1

• B) 4

• C) -3

• D) 7

• E) 0

7. Which element is reduced? Au(NO3)3+3AgAgNO3+Au

• A) Au

• B) Ag

• C) O

• D) N

8. How can you tell if the equation is an oxidation or reduction?

• A) Oxidation loses an e-, reduction gains an e-

• B) Oxidation gains an e-, reduction loses an e-

• C) No change

• D) there is no product

9. What is the oxidation number of C in Al(HCO3)3?

• A) +4

• B) +3

• C) +2

• D) -4

10. What is the oxidized element in this reaction C+H2OCO+H2

• A) O

• B) C

• C) H

• D) 2

11. What is the reducing agent in the following reaction

KCl+H2SO4KHSO4+HCl• A) KCl

• B) H2SO4

12.What is the sum of the oxidation numbers of all the elements in the

compound arsenate (AsO43-)

• A) 5+

• B) -11

• C) -3

• D) 3

13. In a redox reaction the oxidation agent….

• A) loses an e-

• B) gains an e-

• C) causes an element to lose an e-

• D) causes an element to gain an e-

14. Zn+Cu2+Zn2++Cu This reaction is

• A) not a redox reaction

• B) a redox reaction

• C) unbalanced and not a redox reaction

• D) unbalanced redox reaction

15. Oxidation is…

• A) when an element gains an e-

• B) when an element loses an e-

• C) a decrease in the oxidaton number

• D) when an oxygen atom is added to a compound

16. S+O22-SO2+4e- is the ____ half-reaction

• A) Oxidation

• B) reduction

17. Oxidation number for Mn in KMnO4?

• A) 1

• B) -2

• C) 4

• D) 0