Oxidation-Reduction Reactions Chemistry Worksheet Page 37
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Chapter Problems
75.
Sodium perbromate is an oxidizing agent that can be made in the two ways
represented by the equations below. The first equation shows the way it was made
in the past, and the second equation represents the technique used today.
+ XeF
+ H
O → NaBrO
+ 2HF + Xe
NaBrO
3
2
2
4
+ F
+ 2NaOH → NaBrO
+ 2NaF + H
NaBrO
O
3
2
4
2
Determine the oxidation number for each atom in each of these equations, and
decide whether each reaction is a redox reaction or not. If a reaction is a redox
reaction, identify which substance is oxidized, which substance is reduced, the
oxidizing agent, and the reducing agent.
76. Calcium hydrogen sulfite, Ca(HSO
)
, which is used as a paper pulp preservative
3
2
and as a disinfectant, is made by reacting sulfur dioxide with calcium hydroxide.
+ Ca(OH)
→ Ca(HSO
2SO
)
2
2
3
2
Determine the oxidation number for each atom in the equation and decide
whether the reaction is a redox reaction or not. If the reaction is a redox reaction,
identify which substance is oxidized, which substance is reduced, the oxidizing
agent, and the reducing agent.
77.
The following equations represent reactions that involve only halogen atoms.
Iodine pentafluoride, IF
, is used to add fluorine atoms to other compounds,
5
bromine pentafluoride, BrF
, is an oxidizing agent in liquid rocket propellants,
5
and chlorine trifluoride, ClF
, is used to reprocess nuclear reactor fuels.
3
IF(g) + 2F
(g) → IF
2
5
BrF(g) + 2F
(g) → BrF
(g)
2
5
(g) + 3F
(g) → 2ClF
Cl
(g)
2
2
3
Determine the oxidation number for each atom in these equations, and decide
whether each reaction is a redox reaction or not. If a reaction is a redox reaction,
identify which substance is oxidized, which substance is reduced, the oxidizing
agent, and the reducing agent.
78. The water solution of hydrogen peroxide, H
O
, used as an antiseptic (3%)
2
2
and bleach (6%) are stored in dark plastic bottles because the reaction below is
accelerated by the metal ions found in glass and by light.
(aq) → 2H
O(l ) + O
2H
O
(g)
2
2
2
2
Determine the oxidation number for each atom in the equation and identify
whether the reaction is a redox reaction or not. If the reaction is redox, identify
what is oxidized and what is reduced.
79.
Sodium sulfate, which is used to make detergents and glass, is formed in the
following reaction.
4NaCl + 2SO
+ 2H
O + O
→ 2Na
+ 4HCl
SO
2
2
2
2
4
Determine the oxidation number for each atom in the equation and decide
whether the reaction is a redox reaction or not. If a reaction is a redox reaction,
identify which substance is oxidized, which substance is reduced, the oxidizing
agent, and the reducing agent.
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