Chemistry Concepts and Applications

Chapter 16: Oxidation-Reduction Reactions

Standardized Test Practice

1
In the diagram, oxygen gains two electrons from zinc. Why?

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A)Each atom now has a more stable outer shell.
B)Each atom now is electrically neutral.
C)Each atom now has the same number of electrons.
D)Each atom now has equal numbers of electrons and protons.
2
What are the products of the redox reactions in a blast furnace?

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A)carbon dioxide and water
B)carbon dioxide and iron
C)iron ore and coal
D)carbon monoxide and coke
3
What happens if a hole or crack develops in the tin coating of a steel can?

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A)The tin grows back to cover the hole or crack.
B)The corrosive material degrades the tin more rapidly.
C)The corrosive material rapidly degrades the iron in the steel can.
D)The corrosive material has no effect on the steel can.
4
What is the oxidation number of oxygen as a free element?
A)0
B)1-
C)2-
D)2+
5
What is the oxidation number of chlorine in KClO3?
A)5+
B)3+
C)1-
D)1+
6
What is the oxidizing agent in the reaction Cu(s) + 2AgNO3(aq) → 2Ag(s) + Cu(NO3)2(aq)?
A)Ag+
B)NO3-
C)Cu(s)
D)Ag(s)
7
What is the reducing agent in the reaction Cu(s) + 2AgNO3(aq) → 2Ag(s) + Cu(NO3)2(aq)?
A)Ag+
B)NO3-
C)Cu(s)
D)Ag(s)
8
What chemical species is reduced in the reaction represented by the unbalanced equation H2O2(l) + Br-(aq) → Br2(aq) + H2O(l)?
A)Br-(aq)
B)H2O2(l)
C)O-(aq)
D)Br2(aq)
9
Which of the following describes oxidation?
A)gain of electrons
B)gain of positive charge
C)loss of electrons
D)loss of positive charge
10
The fixer used in black-and-white photography contains __________.
A)barium ions
B)chloride ions
C)sulfur atoms
D)thiosulfate ions
11
What is the most abundant element in the Earth's crust?
A)silicon
B)oxygen
C)aluminum
D)iron
12
Which type of can takes the longest to degrade?
A)aluminum
B)iron
C)steel
D)tin
13
When aluminum metals reacts with the tarnish on silver, products of the reaction include __________.
A)Ag and Al3+
B)Ag+ and Al
C)Ag and H+
D)Al and OH-
14
The vitamin C in lemons is a/an __________.
A)carbohydrate
B)corrosive compound
C)antioxidant
D)oxidizing agent
15
Bleach removes stain from clothing by __________ colored molecules.
A)dissolving
B)oxidizing
C)protecting
D)reducing
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