Exploring Creation Chemistry Module #16 Test
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01. Explain why oxidation numbers are not actually real charges.
02. An atom has an oxidation number of -3 in one molecule. If it is placed in another molecule whose other atoms are significantly less electronegative than the atoms in the first molecule, will the oxidation number increase (become less negative) or decrease (become more negative)?
03. Why must a reduction always accompany oxidation?
04. A student looks at the reaction used in an alkaline battery and notices that it contains liquid water. He then concludes that it must not be a dry cell. What is wrong with the student's reasoning?
05. Is the alkaline battery that we discussed rechargeable? Why or why not?
06. Why do even rechargeable batteries eventually lose the ability to recharge?
07. Give the oxidation numbers of all atoms in the following compounds:
a. MnO
2
b. PO
3-
c. SO
2
d. MgBr
2
e. KClO
3
f. PF
4
g. PtCl
4
2-
h. N
2
08. An atom changes its oxidation number from -1 to +1. Is it oxidized or reduced? How many electrons did it take to do this?
09. An atom changes its oxidation number from 0 to -2. Is it oxidized or reduced? How many electrons did it take to do this?
10. An atom changes its oxidation number from +3 to -1. Is it oxidized or reduced? How many electrons did it take to do this?
11. An atom changes its oxidation number from 0 to +3. Is it oxidized or reduced? How many electrons did it take to do this?
12. Determine whether or not each of the following is a redox reaction. If it is, determine which atom is being reduced and which is being oxidized.
a. O
2
(g) + Cl
2
(g) -> 2OCl (g)
b. 2H
3
O
+
+ Cu (s) + 2HNO
3
(aq) -> Cu
(aq) + 2NO
2
(g) + 4H
2
O (l)
c. HNO
3
(aq) + NH
3
(aq) -> NH
4
+
(aq) + NO
3
- (aq)
d. 5HSO
3
- (aq) + 2IO
3
- (aq) -> I
2
(aq) + 5SO
4
2-
(aq) - 3H+ (aq) + H
2
O (I)
e. Al
2
O
3
(aq) + 6NaOH (aq) -> 2Al(OH)
3
(s) + 3Na
2
O (aq)
13. A Galvanic cell runs on the following reaction:
3Ba (s) + 2Al
3+
(aq) -> 3Ba
2+
(aq) + 2Al (s)
Draw a diagram for this Galvanic cell, labeling the electron flow, the anode and cathode, and the positive and negative sides of the Galvanic cell.
14. A Galvanic cell runs on the following reaction:
8H
2
S (aq) + 8F
2
(aq) -> 16HF (aq) + Sg (s)
Draw a diagram for this Galvanic cell, labeling the electron flow, the anode and cathode, and the positive and negative sides of the Galvanic cell.