Free Printable Electrolysis

Worksheets

Electrolysis

Total questions: 19

Worksheet time: 12mins

Name

Class

Date

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.

___________ electrode is an inert electrode.

Copper

Iron

Carbon

Zinc

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

Breaking apart

Losing electrons

Clumping together.

Gaining electrons

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

Al³⁺ - 3e^- --> Al

Al²⁺ + 3e^- --> Al

Al³⁺ + 3e^- --> Al

Al³⁺ --> Al + 3e^-

Which equation shows what happen to chloride ions at the anode.

Cl^- --> Cl + e-

2Cl^- --> Cl₂ + 2e-

Cl₂ - -> 2e-+ 2Cl^-

Cl₂ + 2e-_-->2Cl^-

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

Oxidation is loss of electron. Where does oxidation take place during electrolysis.

At anode

In the electrolyte

At the circuit

At cathode

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

Hydrogen

Oxygen

Chlorine

Sodium

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

10.

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

11.

The negatively charged ions are attracted to the ________.

anode

cathode

12.

What is the name of the negative electrode?

cathode

anode

13.

What state must the ionic compound be in to be electrolysed?

aqueous only

solid only

solid or aqueous only

molten or aqueous only

14.

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

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 ions are present in molten aluminium oxide?

Al³⁺, O^2-, H⁺, OH^-

Al³⁺, O^2-

Al³⁺, OH^-

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.

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

19.

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

100 %

Electrolysis

Total questions: 19

Worksheet time: 12mins

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