Electrochemistry, assignment help

Science

QUESTION 1

Oxidation-reduction reactions are reactions in which:

protons are transferred from one reactant to another

electrons are transferred within the same atom

electrons are transferred from one reactant to another

oxygen molecules must participate

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QUESTION 2

In a reaction, oxidation can occur independently of reduction.

TRUE

FALSE

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QUESTION 3

Preventing the rusting of iron is a major industry. Which of the following methods would NOT control the amount of iron corrosion?

keep the iron sample dry

coat the iron sample with a waterproof coating

place a sacrificial electrode in contact with the iron

bathe the iron in a weakly acidic solution

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QUESTION 4

The oxidation number of an atom of a free element is always 1.

TRUE

FALSE

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QUESTION 5

In their compounds, metals:

are assigned positive oxidation numbers

are assigned negative oxidation numbers

are assigned oxidation numbers of zero

can be assigned any oxidation number that balances the equation

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QUESTION 6

In the reaction, C + 2 S Imported Asset CS2, the substance that is the oxidizing agent is:

the C

the S

the CS2

both the C and the S

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QUESTION 7

In the reaction, 2 Al (s) + 3 Sn+2 (aq) Imported Asset 2 Al+3 (aq) + 3 Sn (s), the reducing agent is:

the Al

the Sn+2

the Al+3

the Sn

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QUESTION 8

How many electrons should be added to balance the following oxidation half-reaction, H2O2 Imported Asset 2 H+ + O2?

None

One

Two

Four

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QUESTION 9

When balancing the oxidation and reduction half-reactions for basic solutions, you should:

use H+ and OH− equally in order to balance the equation

use H+ only in order to balance the equation

use H+ and H2O, as needed to balance the equation

use OH− and H2O, as needed to balance the equation

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QUESTION 10

Electrochemical reactions are oxidation-reduction reactions that:

are capable of generating electric current

have unequal oxidation numbers on both sides of the equation

only generate the oxidation reaction

only generate the reduction reaction

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QUESTION 11

The voltaic cell produces electric current from a spontaneous chemical reaction, but electrolytic reactions are not spontaneous.

TRUE

FALSE

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