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AQA Chemistry - Electrolysis

Total questions: 27

Worksheet time: 18mins

Name

Class

Date

What is electrolysis?

breaking down of a compound using a current

making a compound using a current

Which statement correctly describes the 2 electrodes?

The anode is negative and the cathode is positive

The anode and cathode are both positive

The anode is positive and the cathode is negative

The anode and cathode are both negative.

What is the name given to the solution that is being electrolysed?

Salt solution

Electric solution

Mineral solution

Electrolyte

It is essetial that the electrolyte is a liquid so that...

Charged ions can migrate towards the electrodes.

The solution can move around.

The current can flow through it.

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

Breaking apart

Losing electrons

Clumping together.

Gaining electrons

When NaCl solution is electrolysed what has forms at the anode?

Hydrogen

Oxygen

Chlorine

Sodium

What is the equation to show what happens to Cl ions at the anode.

Cl^- --> Cl + e-

2Cl^- --> Cl₂ + 2e-

Cl₂ + 2e-2Cl^-

Cl₂ + 2e-_-->2Cl^-

___________ electrode is an inert electrode.

Copper

Iron

Carbon

Zinc

Choose the half-equation that shows the discharge of aluminium ion.

Al³⁺ - 3e^- --> Al

Al²⁺ + 3e^- --> Al

Al³⁺ + 3e^- --> Al

Al³⁺ --> Al + 3e^-

10.

Ionic compounds do not conduct electricity when they are solid because,

their electrons are not free to move

their ions are free to move

their ions are not free to move

their electrons are free to move

11.

In an aqueous solution of copper chloride, which ions are attracted to the negative electrode?

Cu²⁺and Cl^-and H⁺and OH^-

Cu²⁺and H⁺

Cl^-and OH^-

Cu²⁺

12.

What are the ions present in molten Al₂O₃?

Al²⁺ and O^3-

Al^2- and O³⁺

Al³⁺ and O^2-

Al^3- and O²⁺

13.

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?

Bromine atoms in lead(II) bromide are converted to ions when it is melted

Electrons flow through the lead(II) bromide when it is melted

The ions in lead(II) bromide are mobile charge carriers in the molten state.

There are no ions in solid lead(II) bromide

14.

What is the product formed at the anode during the electrolysis of concentrated copper(II) chloride?

copper

chlorine

hydrogen

oxygen

15.

What is the half-equation for the discharge of hydroxide ions?

2O^2---> O₂+ 4e^-

OH^- --> OH + e

4OH^- --> 2H₂O + O₂ + 4e^-

2H₂O + O₂ + 4e^- --> 4OH^-

16.

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

Molten silver chloride

Aqueous silver nitrate

Sodium chloride solution

Copper(II) sulphate solution

17.

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?

The mass of graphite anode decreases.

The blue colour solution becomes paler.

Bubbles of gas form at the anode.

The blue colour solution becomes darker.

18.

What is the name of the ore that contains aluminum

Bauxite

Cryolite

Aluminum oxide

19.

Which is not a reason that cryolite is used in aluminum extraction?

Cryolite dissolves aluminum oxide

Cryolite reduces the melting point of aluminum oxide

Cryolite decreases the cost of aluminum extraction

Cryolite removes impurities from aluminum oxide

20.

The anode has to be replaced because

The oxygen reacts with the carbon anode to form carbon dioxide

Aluminum reacts with the carbon to form aluminum carbide

The anode gets impurities that impact the extraction

21.

What is an ore?

a solid metal

a rock cantaining a metal combined with other elements

an element

an object used to row a boat

22.

What is the removal of oxygen from a substance called?

reduction

extraction

electrolysis

oxidation

23.

What is oxidation?

loss of oxygen

gain of electrons

gain of hydrogen

loss of electrons

24.

Which series is used to predict the reactions of metals with carbon and other elements?

reactionary series

reaction series

redox series

reactivity series

25.

Which of the following solutions would produce hydrogen gas at the cathode upon electrolysis?

1 Dilute nitric acid

2 Aqueous potassium hydroxide

3 Aqueous sodium chloride

1 only

1 and 2

2 and 3

All of the above

26.

What does the Cathode (-) do to ions?

Give electrons to the Positive ions to turn them back into atoms

Take electrons from the positive ions?

Turn ions back into atoms by removing electrons

Turn atoms into ions by adding electrons

27.

Why is electrolysis of aqueous (dissolved) solutions more complicated than molten?

Water is messy

Water contributes hydrogen and hydroxide ions to the electrolyte

It is easier to dissolve some substances in water than to melt them

100 %

AQA Chemistry - Electrolysis

Total questions: 27

Worksheet time: 18mins

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