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Electrolysis

Total questions: 30

Worksheet time: 22mins

Name
Class
Date
1.
What is electrolysis?
a)
breaking down of a compound using a current
b)
making a compound using a current
2.
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.
3.
What is the name given to the solution that is being electrolysed?
a)
Salt solution
b)
Electric solution
c)
Mineral solution
d)
Electrolyte
4.
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
5.
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
6.
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
7.
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
8.
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- 
9.
What is the name of the positive electrode?
a)
cathode
b)
anode
10.
What is the name of the negative electrode?
a)
cathode
b)
anode
11.

The negatively charged ions are attracted to the ________.

a)

anode

b)

cathode

12.

In electrolytic cell that uses aqueous copper(II) sulfate as electrolyte and copper plates as electrodes, what is the product at the anode?

a)

Oxygen gas and water

b)

Copper metal

c)

Copper(II) ions

d)

Hydrogen gas

13.

Anions get discharged by ________ electrons at the ___________

a)

gaining, cathode

b)

losing, anode

c)

gaining, anode

d)

losing, cathode

14.

What is the gas produced at the anode during the electrolysis of very dilute hydrochloric acid?

a)

water

b)

oxygen

c)

hydrogen

d)

chlorine

15.
What is the product formed at the anode during the electrolysis of concentrated copper(II) chloride?
a)
copper
b)
chlorine
c)
hydrogen
d)
oxygen
16.

Positive ions (cations) move towards the cathode (-) where they will discharge by....

a)

Breaking apart

b)

Losing electrons

c)

Clumping together.

d)

Gaining electrons

17.

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-

18.

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-

19.

What factors do not affect the products of electrolysis in the electrolysis of aqueous magnesium chloride using graphite electrodes?

a)

position of ions in the electrochemical series

b)

concentration of ions in the solution

c)

type of electrodes

20.

What ions are present in molten aluminium oxide?

a)

Al3+, O2-, H+, OH-

b)

Al3+, O2-

c)

Al3+, OH-

21.

Electroplating is an industrial process where objects are coated by a thin layer of a nonreactive metal by electrolysis. What should be used as the cathode in this process?

a)

Graphite electrode

b)

The electroplating metal

c)

The object to be electroplated

d)

Magnesium ribbon

22.

If the fork is to be electroplated with silver metal, what electrolyte should be used?

a)

Molten silver chloride

b)

Aqueous silver nitrate

c)

Sodium chloride solution

d)

Copper(II) sulphate solution

23.

The picture shows electrolysis of copper(II) sulphate solution using graphite electrodes. Besides formation of brown solid on the cathode, what other observations can be made?

a)

The mass of graphite anode decreases.

b)

The blue colour solution becomes paler.

c)

Bubbles of gas form at the anode.

d)

The blue colour solution becomes darker.

24.
How could you extract sodium from molten sodium chloride?
a)
reduction by carbon
b)
electrolysis
c)
decomposition
d)
oxidation
25.
What is the product formed at the cathode during the electrolysis of molten magnesium fluoride?
a)
magnesium
b)
hydrogen
c)
fluorine
d)
oxygen
26.
What is the gas produced at the anode during the electrolysis of dilute hydrochloric acid?
a)
water
b)
oxygen
c)
hydrogen
d)
chlorine
27.
Why can ionic compounds not conduct electricity when they are solid?
a)
their electrons are not free to move
b)
their ions are free to move
c)
their ions are not free to move
d)
their electrons are free to move
28.
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
29.
Which non-metal is often used for electrodes?
a)
carbon
b)
copper
c)
zinc
d)
silicon dioxide
30.
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+ 

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