Transcript Give the oxidation number for the indicated element S in H2S2O7

1. Give the oxidation number for
the indicated element
S in H2S2O7
A)
B)
C)
D)
E)
4
3
6
-4
-6
2. What is the oxidation number of
Cl in ClO3•
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A)4
B)5
C)1
D)-1
E) none of the above
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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 an 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?
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A)1
B) 4
C) -3
D) 7
E) 0
7. What is the oxidation number of
Na in NaCl?
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A) -2
B) +2
C) +1
D) -1
E) there is no oxygen
8. Which element is reduced?
Au(NO3)2+3 AgAgNO3+Au
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A) Au
B) Ag
C) N
D) O
9. 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
10.What is the oxidation number of
C in Al(HCO3)3?
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A) +4
B) +3
C) +2
D) -4
11. What is the oxidized element in
this reaction C+H2OCO+H2
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A) O
B) C
C) H
D) 2
12.What is the reducing agent in
the following reaction
KCl+H2SO4KHSO4+HCl
• A) KCl
• B) H2SO4
13.What is the sum of the oxidation
numbers of all the elements in the
compound arsenate (AsO43-)
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A) 5+
B) -11
C) -3
D) 3
14. In a redox reaction the
oxidation agent….
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A) loses an eB) gains an eC) causes an element to lose an eD) causes an element to gain an e-
15. Zn+Cu2+Zn2++Cu This
reaction is
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A) not a redox reaction
B) a redox reaction
C) unbalanced and not a redox reaction
D) unbalanced redox reaction
16. Oxidation is…
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A) when an element gains an eB) when an element loses an eC) a decrease in the oxidaton number
D) when an oxygen atom is added to a
compound
17. S+O22-SO2+4e- is the
reduction
• A) Oxidation
• B) reduction
18. Oxidation number for Mn in
KMnO4?
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A) 1
B) -2
C) 4
D) 0