Oxidation-Reduction Reactions Chemistry Worksheet Page 38
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Chapter 6
Oxidation-Reduction Reactions
80. Hydrogen gas can be made in two steps:
(g) + H
O(g) → CO(g) + 3H
CH
(g)
4
2
2
CO(g) + H
O(g) → CO
( g) + H
(g)
2
2
2
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 redox, identify
which substance is oxidized and which substance is reduced. (You do not need to
identify the oxidizing agent and the reducing agent.)
81.
Elemental sulfur is produced by the chemical industry from naturally occurring
hydrogen sulfide in the following steps.
S + 3O
→ 2SO
+ 2H
2H
O
2
2
2
2
+ 2H
S → 3S + 2H
SO
O
2
2
2
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.
82. Sodium chlorate, NaClO
, which is used to bleach paper, is made in the
3
following reactions. Determine the oxidation number for each atom in the
equations and identify whether each reaction is a redox reaction or not. If a
reaction is redox, identify what is oxidized and what is reduced.
+ 2NaOH → NaOCl + NaCl + H
Cl
O
2
2
3NaOCl → NaClO
+ 2NaCl
3
83.
Leaded gasoline, originally developed to decrease pollution, is now banned
because the lead(II) bromide, PbBr
, emitted when it burns decomposes in the
2
atmosphere into two serious pollutants, lead and bromine. The equation for this
reaction is below. 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.
sunlight
Pb + Br
PbBr
2
2
84. When leaded gasoline was banned, there was a rush to find safer ways to reduce
emissions of unburned hydrocarbons from gasoline engines. One alternative
is to add methyl t‑butyl ether (MTBE). In 1990, about 25% of the methanol,
CH
OH, produced by the U.S. chemical industry was used to make methyl
3
t‑butyl ether. The equations below show the steps used to make methanol.
Determine the oxidation number for each atom in the equation and identify
whether the reactions are redox reactions or not. For each redox reaction, identify
what is oxidized and what is reduced.
+ 2H
O + CO
→ 4CO + 8H
3CH
4
2
2
2
CO + 2H
→ CH
OH
2
3
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