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.
3 answers
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.
4 answers