Oxidation-Reduction Reactions Chemistry Worksheet Page 35
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Chapter Problems
Additional Problems
66. Nitric acid, which is used to produce fertilizers and explosives, is made in the
following three steps. Determine the oxidation number for each atom in the
three 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.
+ 5O
→ 4NO + 6H
4NH
O
3
2
2
2NO + O
→ 2NO
2
2
+ H
O → 2HNO
+ NO
3NO
2
2
3
67.
Sodium hydrogen carbonate, NaHCO
, best known as the active ingredient in
3
baking soda, is used in several ways in food preparation. It is also added to animal
feeds and used to make soaps and detergents. Baking soda can also be used to
put out small fires on your stovetop. The heat of the flames causes the NaHCO
3
to decompose to form carbon dioxide, which displaces the air above the flames
depriving the fire of the oxygen necessary for combustion. The equation for the
reaction is below.
∆
(s) + H
O(l ) + CO
2NaHCO
(s)
Na
CO
(g )
3
2
3
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.
68. Swimming pools can be chlorinated by adding either calcium hypochlorite,
Ca(OCl)
, or sodium hypochlorite, NaOCl. The active component is the
2
‒
hypochlorite ion, OCl
. Because the rate of the following reaction is increased
by ultraviolet radiation in sunlight, it is best to chlorinate pools in the evening to
avoid the hypochlorite ion’s decomposition.
‒
‒
(aq) → Cl
(aq) + ½O
OCl
(g)
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.
69.
In the past, mercury batteries were commonly used to power electronic watches
and small appliances. The overall reaction for this type of battery is
HgO(s) + Zn(s) → ZnO(s) + Hg(l )
Determine the oxidation number for each atom in the equation and decide
whether the reaction is a redox reaction or not. If it is redox, identify which
substance is oxidized, which substance is reduced, the oxidizing agent, and the
reducing agent.
70. Silver batteries have been used to run heart pacemakers and hearing aids. The
overall reaction for this type of battery is
O(s) + Zn(s) → ZnO(s) + 2Ag(s)
Ag
2
Determine the oxidation number for each atom in the equation and decide
whether the reaction is a redox reaction or not. If it is redox, identify which
substance is oxidized, which substance is reduced, the oxidizing agent, and the
reducing agent.
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