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WorksheetsELECTROCHEMISTRY MIDTERM QUIZ
Total questions: 50
Worksheet time: 30mins
Name
Class
Date
1.
Which energy conversion shown below takes place in an electrochemical cell?
a)
Electrical to chemical
b)
Mechanical to chemical
c)
Mechanical to electrical
d)
Chemical to electrical
2.
Reduction happens at the
a)
Spa anode
b)
Cathode
c)
Salt bridge
d)
Anode
3.
Oxidation happens at the
a)
Anode
b)
Cathode
c)
Salt bridge
d)
Voltmeter
4.
This electrode in a galvanic cell gains mass
a)
Anode
b)
Cathode
5.
This electrode in a galvanic cell loses mass
a)
Anode
b)
Cathode
6.
In a galvanic cell, the half cell that receives anions from the salt bridge is
a)
Cathode
b)
Anode
7.
In a galvanic cell, the half cell that receives cations from the salt bridge is
a)
Cathode
b)
Anode
8.
What unit of measurement do we use to measure electrical potential?
a)
Watts
b)
Volts
c)
Amps
d)
Ohms
9.
In which direction does electricity flow in a galvanic (voltaic) cell (battery)?
a)
Electrons flow from the cathode to the anode
b)
Electrons flow from left to right
c)
Electrons flow from anode to cathode
d)
Electrons flow from right to left
10.
What does OIL RIG mean?
a)
It's a pump used to remove oil from the ground
b)
Oxidation is losing protons, reduction is gaining protons
c)
Oxidation is losing electrons, reduction is gaining electrons
d)
Who knows?
11.
In electrolytic cell which its electrolyte is copper (II) sulphate, copper strips are used as electrodes. What is the product at the anode?
a)
Oxygen gas and water
b)
Copper metal
c)
Copper (II) ions
d)
Hydrogen gas
12.
In electrolytic cell, anode electrode is connected to...
a)
Positive Terminal
b)
Negative Terminal
13.
Metals which conduct electrons in and out of solutions.
a)
anodes
b)
electrodes
c)
cathodes
d)
geodes
14.
Charge on the anode in a galvanic cell.
a)
positive
b)
negative
15.
Charge on the cathode in a voltaic cell.
a)
positive
b)
negative
16.
The cell potential of a spontaneous reaction is
a)
positive
b)
negative
17.
Type of electrochemical cell in which a spontaneous chemical reaction produces a flow of electrons.
a)
voltaic (galvanic) cell
b)
electrolytic cell
c)
prison
18.
Type of electrochemical cell in which a nonspontaneous chemical reaction is forced to occur by a flow of electrons.
a)
voltaic cell
b)
electrolytic cell
c)
prison
19.
A voltaic cell in which the electrolyte is a paste.
a)
dry cell
b)
wet cell
c)
battery
d)
fuel cell
20.
A voltaic cell created by a number of cells connected in a series.
a)
dry cell
b)
wet cell
c)
battery
d)
fuel cell
21.
A voltaic cell in which the materials to be oxidized or reduced may be continuously supplied.
a)
dry cell
b)
wet cell
c)
battery
d)
fuel cell
22.
In a hydrogen-oxygen fuel cell, what is the material that is reduced?
a)
hydrogen
b)
oxygen
c)
water
d)
glucose
23.
A car battery can act as both a voltaic cell and an electrolytic cell.
a)
True
b)
False
24.
In a voltaic cell involving zinc metal and one of its salts and copper metal and one of its salts, which metal would be used as the anode?
a)
zinc
b)
copper
25.
Charge on the anode in an electrolytic cell.
a)
positive
b)
negative
26.
Charge on the cathode in an electrolytic cell.
a)
positive
b)
negative
27.
The electrolysis of brine produces
a)
water, sodium metal and chlorine gas
b)
aqueous sodium hydroxide, hydrogen gas and chlorine gas
c)
sodium metal and hydrogen gas
d)
hydrochloric acid and sodium metal
28.
The electrolysis of molten sodium chloride produces
a)
hydrochloric acid
b)
sodium metal and chlorine gas
c)
chlorine gas and aqueous sodium hydroxide
d)
glucose
29.
The electrolysis of water produces
a)
acids and bases
b)
hydrogen gas only
c)
hydrogen gas and oxygen gas
d)
oxygen gas only
30.
In the electrolysis of water, hydrogen gas is produced at the
a)
anode
b)
cathode
31.
In the electrolysis of brine, chlorine gas is produced at the
a)
anode
b)
cathode
32.
In the electrolysis of molten sodium chloride sodium metal is produced at the
a)
anode
b)
cathode
33.
The covering of a thin layer of metal is
a)
electrowinning
b)
electrorefining
c)
electroplating
d)
electromachining
34.
To electroplate an object it would have to be made to be the
a)
anode
b)
cathode
35.
To electroplate an object with silver it would have to be the __________ and have a __________ charge.
a)
anode, positive
b)
anode, negative
c)
cathode, positive
d)
cathode, negative
36.
Which substance is reduced in the following reaction?
NaOH + Li --> LiOH + Na
NaOH + Li --> LiOH + Na
a)
Li
b)
Na
c)
O
d)
H
37.
Which of the following is the balanced half -reaction for the oxidation of Cu to Cu+2?
a)
Cu --> Cu+2
b)
Cu + 2 e- --> Cu+2
c)
Cu --> Cu+2 + 2 e-
d)
Cu - 2e- --> Cu+2
38.
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
a)
Reduced
b)
Synthesized
c)
Oxidized
d)
None of the above
39.
If in a reaction, copper is reduced; its number of electrons has:
a)
Increased
b)
Decreased
c)
Remained Constant
d)
Varies Randomly
40.
Oxygen always has an oxidation number of...
a)
-1
b)
1
c)
2
d)
-2
41.
What coefficient would Fe+2 have in the following reaction?
___ Al + ___ Fe+2 → ___ Al+3 + ___ Fe
___ Al + ___ Fe+2 → ___ Al+3 + ___ Fe
a)
1
b)
2
c)
3
d)
6
42.
In electrolytic cell, anode will attract...
a)
Cations
b)
Anions
43.
In electrolysis of 0.001 mol/dm3 aqueous NaCl solution, which ion will be selectively discharged at the anode?
a)
Na + ions
b)
Cl - ions
c)
OH- ions
d)
H+
44.
A group of cells that are connected together
a)
anode
b)
battery
c)
salt bridge
d)
half cell
45.
The process in which electrical energy is used to bring about a chemical change
a)
fuel cell
b)
battery
c)
electrolysis
d)
voltaic cell
46.
A voltaic cell in which a fuel undergoes oxidation and from which electrical energy is obtained continuously.
a)
battery
b)
fuel cell
c)
salt bridge
d)
anode
47.
The electrode at which reduction occurs
a)
cathode
b)
anode
c)
salt bridge
d)
electrode
48.
A conductor in a circuit that carries electrons to or from a substance other than a metal.
a)
electrode
b)
battery
c)
salt bridge
d)
half cell
49.
An iron nail is put into a solution of copper nitrate, iron is above copper in the activity series of metals, what will happen?
a)
iron will be reduced
b)
bubbles of oxygen gas will form on iron nail
c)
the iron nail will become copper plated
d)
no reaction occurs
50.
Which is true about fuel cells
a)
designed so they emit no polllutants
b)
very inexpensive
c)
produces energy in short bursts only
d)
never built or used
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