Chemistry: Please check answers

12.
What balances charges that may build up as reduction and oxidation occur in a voltaic cell?

*the salt bridge
one of the half-cells
the electrolyte solutions
the moving electrons

13.
What is the electrode in the center of the most common dry cell made of?

copper
zinc
iron
*graphite

14.
How is a lead storage battery recharged?

*A direct current is applied to it.

A magnet is held close to it.

Alternating current is forced through it.

The pressure on it is increased.

15.
What happens in a hydrogen-oxygen fuel cell?

*Oxygen diffuses through the cathode.

Oxygen diffuses through the anode.

Hydrogen diffuses through the cathode.

Hydrogen and oxygen are mixed before entering the anode.

16.
What standard reduction electrode has a half-cell potential of 0.00 V?

oxygen
*hydrogen
lithium
fluorine

17.
Which of the following is the name of a process in which electrical energy causes a chemical reaction?

hydrolysis
*electrolysis
oxidation
electronation

18.
Which of the following is true about an electrolytic cell?

It changes electrical energy into chemical energy.

It is the type of cell used in electroplating.

It uses an electric current to make a nonspontaneous reaction go.

*all of the above

19.
Identify the products formed in the net reaction of the electrolysis of water.

liquid hydrogen and oxygen gas

liquid oxygen and hydrogen gas

*hydrogen gas and oxygen gas

aqueous hydrogen ion and hydroxyl ion

20.
What occurs in electroplating?

deposition of a salt layer on a metal

*deposition of a metal layer on a
material

decomposition of a metal layer

decomposition of a salt layer

Thank You.

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  2. 12. I was tempted to pick the salt bridge, too, however, the salt bridge only ALLOWS the balancing charges to pass through is the proper direction. It's the electrolytes that actually do the balancing. Think about that for awhile. The question is somewhat ambiguous.

    20. I agree with your answer; however, I should point out that in order for the metal to be deposited onto another surface, the metal must be "removed" from another place. Many might consider that a decomposition of the metal layer. Again somewhat ambiguous answer; I suspect your answer is the one desired.
    All of the other answers look ok to me.

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