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Redox Chemistry Review

Total questions: 25

Worksheet time: 1hrs 16mins

Name
Class
Date
1.

Which of the following statements refers to an oxidation process?

a)

Hydrogen is added to ethene

b)

Oxygen is removed from carbon dioxide

c)

Chlorine accepts electrons

d)

Increase in the oxidation number of magnesium metal

2.
Oxidation involves
a)
gaining electrons; gaining oxygen
b)
losing electrons; losing oxygen
c)
gaining electrons; losing oxygen
d)
losing electrons; gaining oxygen
3.
Reduction involves 
a)
gaining electrons; gaining oxygen
b)
losing electrons; losing oxygen
c)
gaining electrons, losing oxygen
d)
losing electrons; gaining oxygen
4.
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
a)
Reduced
b)
Synthesized
c)
Oxidized
d)
None of the above
5.
the loss of hydrogen or electrons is known as 
a)
dehydration
b)
hydrogenation
c)
reduction
d)
oxidation
6.

Which process involves the transfer of electrons?

a)

double replacement

b)

neutralization

c)

oxidation-reduction

d)

sublimation

7.

During an oxidation-reduction reaction, the number of electrons gained is

a)

equal to the number of electrons lost

b)

equal to the number of protons gained

c)

less than the number of electrons lost

d)

less than the number of protons gained

8.

In a redox reaction, there is a conservation of

a)

mass, only

b)

charge, only

c)

both mass and charge

d)

neither mass nor charge

9.

During which process does an atom gain one or more electrons?

a)

transmutation

b)

reduction

c)

oxidation

d)

neutralization

10.

Which change in oxidation number indicates oxidation?

a)

-1 to +2

b)

-1 to -2

c)

+2 to -3

d)

+3 to +2

11.
Another name for a "oxidation-reduction" reaction is
a)
chemical reaction
b)
neutralization reaction
c)
redox reaction
d)
nuclear reaction
12.
What element is being Oxidized?
a)
N
b)
H
c)
O
d)
S
13.
What element is being Reduced?
a)
N
b)
H
c)
O
d)
S
14.
What coefficient would Fe+2 have in the following reaction?
___ Al + ___ Fe+2 → ___ Al+3 + ___ Fe
a)
1
b)
2
c)
3
d)
6
15.
Which of the following half reactions correctly represents a reduction half reaction?
a)
Fe →Fe2+ + 2e-
b)
Pb4+ + 2e- →Pb2+
c)
2O-2 →O2 + 4e-
d)
Fe + 3e- →Fe3+
16.
Which of the following reactions is balanced by both mass and charge?
a)
Fe+2 + Al →Fe + Al+3
b)
Cu + Fe+2 → Cu+1 + Fe+3
c)
F2 + Br- --> F- + Br2
d)
Fe+2 + 2 Cu --> 2 Cu+ + Fe
17.

Oxidation is the _________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

18.

Reduction is the ___________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

19.

Which of the following represents oxidation?

a)

C → CH4

b)

Fe3+ → Fe2+

c)

Cl2 → 2Cl-

d)

Zn → ZnO

20.
Which of the following represents reduction?
a)
C →  CO
b)
N2 →  NH3
c)
Zn  →   Zn2+ 
d)
H2 →  H2O
21.
Which statement is true:
Mg → Mg2+ + 2e–
a)
Mg gains 2 electrons
b)
Mg2+ loses 2 electrons
c)
Mg loses 1 electron
d)
Mg loses 2 electrons
22.
Which of the following is the balanced half -reaction for the oxidation of Cu to Cu+2?
a)
Cu   --> Cu+2
b)
Cu + 2 e-   --> Cu+2
c)
Cu  --> Cu+2  + 2 e-
d)
Cu - 2e-  --> Cu+2
23.

In the reaction, Zn + H2O --> ZnO2 + H2, which element, if any, is oxidized?

a)

Zinc

b)

Hydrogen

c)

Oxygen

d)

None

24.
Which substance is reduced in the following reaction? 
NaOH + Li --> LiOH + Na
a)
Li
b)
Na
c)
O
d)
H
25.

Which element is oxidized?

H2S + Cl2 → 2HCl + S

a)

H

b)

S

c)

Cl

d)

Not a redox reaction

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