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
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