WorksheetsIGCSE Chem Electrolysis
Total questions: 20
Worksheet time: 25mins
Name
Class
Date
1.
What is the name of a positively charged ion?
a)
positron
b)
proton
c)
cation
d)
anion
2.
What is the name of a negatively charged ion?
a)
negatron
b)
electron
c)
cation
d)
anion
3.
What is the name of a negatively charged electrode?
a)
cathode
b)
anode
c)
cation
d)
anion
4.
What is the name of a positively charged electrode?
a)
cathode
b)
anode
c)
cation
d)
anion
5.
What state must the ionic compound be in to be electrolysed?
a)
aqueous only
b)
solid only
c)
solid or aqueous only
d)
molten or aqueous only
6.
What particle carries the charge in the wire?
a)
electron
b)
proton
c)
ion
d)
atom
7.
What particle carries the charge in the electrolyte?
a)
electron
b)
proton
c)
ion
d)
atom
8.
In an aqueous solution of copper chloride, which ions are attracted to the negative electrode?
a)
Cu2+ and Cl- and H+ and OH-
b)
Cu2+ and H+
c)
Cl- and OH-
d)
Cu2+
9.
In an aqueous solution of copper chloride, which substance is produced at the positive electrode
a)
copper
b)
chlorine
c)
oxygen
d)
chloride
10.
Which statement correctly describes the 2 electrodes?
a)
The anode is negative and the cathode is positive
b)
The anode and cathode are both positive
c)
The anode is positive and the cathode is negative
d)
The anode and cathode are both negative.
11.
Explain why the electrolyte has to be a liquid.
a)
So the ions can move
b)
So the electrons can move
c)
So that it doesn't get too hot
d)
So the fish are ok
12.
What happens at the positive electrode?
a)
Positive non-metal ions are attracted
b)
Positive metal ions are attracted
c)
Negative non-metal ions are attracted
d)
Negative metal ions are attracted
13.
Positive ions (cations) will move towards the cathode (-) where they will discharge by....
a)
Breaking apart
b)
Losing electrons
c)
Clumping together.
d)
Gaining electrons
14.
What is the equation to show what happens to Cl ions at the anode.
a)
Cl- --> Cl + e-
b)
2Cl- --> Cl2 + 2e-
c)
Cl2 + 2e- 2Cl-
d)
Cl2 + 2e- --> 2Cl-
15.
Choose the half-equation that shows the discharge of aluminium ion.
a)
Al3+ - 3e- --> Al
b)
Al2+ + 3e- --> Al
c)
Al3+ + 3e- --> Al
d)
Al3+ --> Al + 3e-
16.
What is the half-equation for the discharge of hydroxide ions?
a)
2O2- --> O2 + 4e-
b)
OH- --> OH + e
c)
4OH- --> 2H2O + O2 + 4e-
d)
2H2O + O2 + 4e- --> 4OH-
17.
Anions get discharged by ________ electrons at the ___________
a)
gaining, cathode
b)
losing, anode
c)
gaining, anode
d)
losing, cathode
18.
Reduction is the ___________ of electrons.
a)
loss
b)
gain
c)
sharing
d)
transfer
19.
Oxidation is the _________ of electrons.
a)
loss
b)
gain
c)
sharing
d)
transfer
20.
What is oxidation number of Fe in FeO ?
a)
+2
b)
-2
c)
0
d)
+1
100 %
