WorksheetsElectrolysis IGCSE
Total questions: 25
Worksheet time: 28mins
Name
Class
Date
1.
What is electrolysis?
a)
breaking down of a compound using a current
b)
making a compound using a current
2.
What kind of Electrical Current does Electroysis require?
a)
Direct
b)
Indirect
c)
Anternative
d)
A alternating
3.
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.
4.
What is the name given to the solution that is being electrolysed?
a)
Salt solution
b)
Electric solution
c)
Mineral solution
d)
Electrolyte
5.
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
6.
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
7.
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
8.
When NaCl solution is electrolysed what has forms at the anode?
a)
Hydrogen
b)
Oxygen
c)
Chlorine
d)
Sodium
9.
What does the Cathode (-) do to ions?
a)
Give electrons to the Positive ions to turn them back into atoms
b)
Take electrons from the positive ions?
c)
Turn ions back into atoms by removing electrons
d)
Turn atoms into ions by adding electrons
10.
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-
11.
Electrolysis is .....
a)
conduction of electricity by the ionic compound in solid state
b)
conduction of electricity by ionic compound in molten and aqueous state
12.
The positively charged ions migrate toward the ________.
a)
anode
b)
cathode
13.
What is the product formed at the anode during the electrolysis of concentrated copper(II) chloride?
a)
copper
b)
chlorine
c)
hydrogen
d)
oxygen
14.
What element is used to make up the electrodes?
a)
oxygen
b)
iron
c)
carbon
d)
magnesium
15.
What is the name of a positively charged ion?
a)
positron
b)
proton
c)
cation
d)
anion
16.
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-
17.
What does the Cathode (-) do to ions?
a)
Give electrons to the Positive ions to turn them back into atoms
b)
Take electrons from the positive ions?
c)
Turn ions back into atoms by removing electrons
d)
Turn atoms into ions by adding electrons
18.
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
19.
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
20.
How many atoms are in a molecule of water?
a)
3 atoms
b)
2 atoms
c)
1 atom
d)
4 atoms
21.
The cathode of the battery is the ______________________.
a)
Negatively Charged
b)
Positively Charged
c)
Neutral
d)
All the above
22.
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
23.
Electrolysis is .....
a)
conduction of electricity by the ionic compound in solid state
b)
conduction of electricity by ionic compound in molten and aqueous state
24.
The diagram shows the electrolysis of lead(II) bromide using inert electrodes. Why does the bulb only light up when the lead(II) bromide is melted?
a)
Bromine atoms in lead(II) bromide are converted to ions when it is melted
b)
Electrons flow through the lead(II) bromide when it is melted
c)
The ions in lead(II) bromide are acting as the mobile charge carriers when it is melted
d)
There are no ions in solid lead(II) bromide
25.
Complete the half equation Al3+ -->
a)
Al3+ - 3e- --> Al
b)
Al2+ + 3e- --> Al
c)
Al3+ + 3e- --> Al
d)
Al3+ --> Al + 3e-
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