Free Printable Y11 electrolysis revision

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Y11 electrolysis revision

Total questions: 23

Worksheet time: 13mins

Name

Class

Date

What is electrolysis?

breaking down of a compound using a current

making a compound using a current

What kind of Electrical Current does Electroysis require?

Direct

Indirect

Anternative

A alternating

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

Explain why the electrolyte has to be a liquid.

So the ions can move

So the electrons can move

So that it doesn't get too hot

So the fish are ok

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.

What happens at the positive electrode?

Positive non-metal ions are attracted

Positive metal ions are attracted

Negative non-metal ions are attracted

Negative metal ions are attracted

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

10.

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

11.

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^-

12.

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

13.

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

Oxygen gas and water

Copper metal

Copper(II) ions

Hydrogen gas

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.

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

position of ions in the electrochemical series

concentration of ions in the solution

type of electrodes

17.

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?

Graphite electrode

The electroplating metal

The object to be electroplated

Magnesium ribbon

18.

In the electrolysis of brine what products do we get at the anode?

Oxygen gas

hydrogen gas

chlorine gas

sodium metal

19.

In the electrolysis of brine what product do we get at the cathode?

hydrogen gas

oxygen gas

sodium metal

chlorine gas

20.

Which are the useful products of electrolysis of brine?

sodium hydroxide, chlorine and hydrogen

sodium metal, oxygen and chlorine

sodium metal, chlorine and sodium hydroxide

sodium hydroxide, oxygen and hydrogen

21.

Which cell is not spontaneous?

voltaic

electrolytic

22.

Atoms of which element can most easily be oxidized?

Copper

Zinc

Iron

Calcium

23.

In the electrolysis of water, hydrogen gas is produced at the

anode

cathode

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Y11 electrolysis revision

Total questions: 23

Worksheet time: 13mins

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