General Chemistry Ii Jasperse - Electrochemistry Extra Practice Problems With Answers Page 8
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138
Predictable Patterns in Oxidation and Reduction Strength. (Should be able to recognize from
periodic table, but without looking at a table with reduction potentials)
40. Glancing at a periodic table, where do you expect to find elements that are good oxidizing agents?
T
a.
on the right (except for the noble gases)
d.
at the bottom
b.
in the middle left
e.
in the transition metals
c.
in the top left
41. Glancing at a periodic table, where do you expect to find elements that are good reducing agents?
a.
in groups 16 and 17
d.
at the bottom
b.
on the left
e.
in group 17
c.
in the middle
42. Based on the periodic table and general patterns of activity, which is the correct ranking of the halogens as oxidizing
agents? (you should be able to answer without looking at a reduction-potential table.)
F
Cl
Br
I
2
2
2
2
a. F
(strongest oxidant) > Cl
> Br
> I
(weakest oxidant)
2
2
2
2
b. I
(strongest oxidant) > Br
> Cl
> F
(weakest oxidant)
2
2
2
2
c. Cl
(strongest oxidant) > F
> Br
> I
(weakest oxidant)
2
2
2
2
d. Br
(strongest oxidant) > I
> Cl
> F
(weakest oxidant)
2
2
2
2
T
43. Based on the periodic table and general patterns of activity, which is the correct ranking of the following metals as
reducing agents? (Atomic numbers shown)
Mg (12)
K (19)
Au (79)
Fe (26)
a. Mg (strongest reducing agent) > K > Fe > Au (weakest oxidizing agent)
b. K (strongest reducing agent) > Mg > Fe > Au (weakest oxidizing agent)
c. Au (strongest reducing agent) > Mg > Fe > K (weakest oxidizing agent)
d. Fe (strongest reducing agent) > Au > Mg > K (weakest oxidizing agent)
44. Based on the periodic table and general patterns of activity, which of the following would react with metallic calcium?
KBr
NaI
FeCl
NiBr
2
2
a. KBr and NaI only
b. FeCl
only
2
c. NiBr
only
1. Calcium is a reducing agent
2
d. both FeCl
and NiBr
2. Each formula has a metal cation, potential oxidizing agents.
2
2
3. Reduction potential (for elemental metals):
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G1 > G2 > Al > Transition Metals > Hydrogen > "Precious metals"
4. Calcium, being group 2, can reduce anything except Group 1 cations
45. Based on the periodic table and general patterns of activity, which of the following would react with metallic sodium?
-
I
I
FeCl
NiBr
2
2
2
a. I
only
2
-
1. Sodium is a reducing agent, group 1
b. I
only
2. Iodize is already in reduced form, so can't react with reducing agent.
c. NiBr
only
2
3. Reduction potential (for elemental metals):
d. I
, FeCl
and NiBr
2
2
2
G1 > G2 > Al > Transition Metals > Hydrogen > "Precious metals"
4. Calcium, being group 1, can reduce anything except Group 1 cations
5. Iodine is a strong oxidizing agent, and like any elemental halogen
would react with pretty much any elemental metal
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