Practice Questions 4Th Test

Front 1

Which one of the following items does not characterize an oxidizing agent?

a. An oxidizing agent gains electrons.

b. An oxidizing agent causes another species to be oxidized.

c. The oxidation number of an oxidizing agent decreases.

d. A good oxidizing agent is a metal in a high oxidation state, such as Mn7+.

e. An example of a good oxidizing agent is an alkali metal, such as Na.

Back 1

e

Front 2

Fuel cells are being developed for commercial use that use hydrogen as a fuel. In these cells, hydrogen combines with oxygen in the air to produce water as the only product. This combination appears to be a perfect source of energy, except hydrogen is highly explosive and challenging to store. The fuel cells produce no waste products because the water essentially is recycled, and the energy is obtained from the sun rather than from fossil fuels. When 1 mol of hydrogen gas is ________ in the fuel cell, ________mole(s) of electrons are transferred.

Back 2

oxidized; 2

Front 3

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d

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d

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d

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e

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d

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b

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d

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b

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c

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b

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a

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d

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a

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c

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b

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e

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d

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a

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a

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b

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b

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b

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b

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b

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a

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b

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d

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d

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b

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a

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d

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b

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c

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c

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c