Chapter 8 Chemical Equations Solutions To Review Questions Page 3
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9- Chapter 8 -
SOLUTIONS TO EXERCISES
1. (a)
exothermic
(d)
exothermic
(b) endothermic
(e)
endothermic
(c)
exothermic
2. (a)
endothermic
(d)
exothermic
(b) exothermic
(e)
exothermic
(c)
endothermic
3. (a)
2 H
O
2 H
O
combination
2
2
2
l
g
g
(b)
3 N
H
4 NH
N
decomposition
2
4
3
2
(c)
H
SO
2 NaOH
2 H
O
Na
SO
double displacement
2
4
2
2
4
D
(d)
decomposition
Al
CO
Al
O
3 CO
2
3 3
2
3
2
(e)
2 NH
I
Cl
2 NH
Cl
I
single displacement
4
2
4
2
4. (a)
H
Br
2 HBr
combination
2
2
s
aq
s
aq
(b)
BaO
H
SO
BaSO
H
O
double displacement
2
2
4
4
2
2
D
(c)
decomposition
Ba ClO
BaCl
3 O
3 2
2
2
(d)
CrCl
3 AgNO
Cr NO
3 AgCl
double displacement
3
3 3
3
(e)
2 H
O
2 H
O
O
decomposition
2
2
2
2
5. There are many ways to form oxides. For example: (1) some metals plus oxygen, (2) some nonmetals
plus oxygen, (3) some metals plus water (steam), (4) combustion of hydrocarbons
6. A metal and a nonmetal can react to form a salt; the reaction of an acid and a base can form a salt.
7. (a)
2 MnO
CO
Mn
O
CO
2
2
3
2
(b)
Cu
O s
C s
2 Cu s
CO g
2
(c)
4 C
H
NO
12 CO
10 H
O
6 N
O
3
5
3 3
2
2
2
2
(d)
4 FeS
7 O
2 Fe
O
4 SO
2
2
3
2
(e)
2 Cu NO
2 CuO
4 NO
O
3 2
2
2
(f)
3 NO
H
O
2 HNO
NO
2
2
3
2 Fe s
3 S l
s
(g)
Fe
S
2
3
(h)
4 HCN
5 O
2 N
4 CO
2 H
O
2
2
2
2
(i)
2 B
H
12 O
5 B
O
9 H
O
5
9
2
2
3
2
- 85 -
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