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October 22, 2014

Homework Help: Chemistry: Please check answers

Posted by Cassie on Tuesday, April 9, 2013 at 5:48pm.

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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