1. States of matter

1.1 Solids, liquids and gases

1.2 Diffusion

2. Atoms, elements and compounds

2.1 Elements, compounds and mixtures

2.2 Atomic structure and the Periodic Table

2.3 Isotopes

2.4 Ions and ionic bonds

2.5 Simple molecules and covalent bonds

2.6 Giant covalent structures

2.7 Metallic bonding

3. Stoichiometry

3.1 Formulae

3.2 Relative masses of atoms and molecules

3.3 The mole and the Avogadro constant

4. Electrochemistry

4.1 Electrolysis

4.2 Hydrogen–oxygen fuel cells

5. Chemical energetics

5.1 Exothermic and endothermic reactions

6. Chemical reactions

6.1 Physical and chemical changes

6.2 Rate of reaction

6.3 Reversible reactions and equilibrium

6.4 Redox

7. Acids, bases and salts

7.1 The characteristic properties of acids and bases

7.2 Oxides

7.3 Preparation of salts

8. The Periodic Table

8.1 Arrangement of elements

8.2 Group I properties

8.3 Group VII properties

8.4 Transition elements

8.5 Noble gases

9. Metals

9.1 Properties of metals

9.2 Uses of metals

9.3 Alloys and their properties

9.4 Reactivity series

9.5 Corrosion of metals

9.6 Extraction of metals

10. Chemistry of the environment

10.1 Water

10.2 Fertilisers

10.3 Air quality and climate

11. Organic chemistry

11.1 Formulae, functional groups and terminology

11.2 Naming organic compounds

11.3 Fuels

11.4 Alkanes

11.5 Alkenes

11.6 Alcohols

11.7 Carboxylic acids

11.8 Polymers

12. Experimental techniques and chemical analysis

12.1 Experimental design

12.2 Acid–base titrations

12.3 Chromatography

12.4 Separation and purification

12.5 Identification of ions and gases

IGCSE Chemistry 4.1 Electrolysis Question Bank

[Maximum number: 1]

Give the name of the process that is used:

(a)

to produce lead from molten lead(II) bromide

[ 1 ]

[Maximum number: 1]

Give the name of the process that is used:

(a)

to produce bromine from molten lead(II) bromide

[ 1 ]

[Maximum number: 1]

Name the process used to:

(a)

produce lead from molten lead(II) bromide

[ 1 ]

[Maximum number: 1]

Which statement about the electrolysis of copper(II) sulfate solution using carbon electrodes is correct?

A colourless gas is produced at the anode.

A colourless gas is produced at the cathode.

The colour of the electrolyte remains the same.

The mass of both electrodes remains constant.

[Maximum number: 1]

Which reactions could take place at the anode during electrolysis?

$14 \mathrm{OH}^{-}(\mathrm{aq}) \rightarrow 2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{O}_{2}(\mathrm{~g})+4 \mathrm{e}^{-}$

$22 \mathrm{Cl}^{-}(\mathrm{aq}) \rightarrow \mathrm{Cl}_{2}(\mathrm{~g})+2 \mathrm{e}^{-}$

$3 \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightarrow \mathrm{Cu}(\mathrm{s})$

$42 \mathrm{H}^{+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightarrow \mathrm{H}_{2}(\mathrm{~g})$

1 and 2

1 and 4

2 and 4

3 and 4

[Maximum number: 8]

Potassium reacts with chlorine to form potassium chloride, KCl.

(a)

Molten potassium chloride undergoes electrolysis.

[ 4 ]

(i)

State what is meant by the term electrolysis.

[ 2 ]

(ii)

Name the products formed at the positive electrode (anode) and negative electrode (cathode) when molten potassium chloride undergoes electrolysis.
anode
cathode

[ 2 ]

(b)

Concentrated aqueous potassium chloride undergoes electrolysis.

[ 4 ]

(i)

Write an ionic half-equation for the reaction at the negative electrode (cathode).

[ 2 ]

(ii)

Name the product formed at the positive electrode (anode).

[ 1 ]

(iii)

Name the potassium compound that remains in the solution after electrolysis.

[ 1 ]

[Maximum number: 1]

The diagram shows the electrolysis of an aqueous solution of X using inert electrodes.

Hydrogen is produced at the cathode and chlorine is produced at the anode.
What is X ?

concentrated copper(II) chloride solution

concentrated hydrochloric acid

dilute hydrochloric acid

dilute sodium chloride solution

[Maximum number: 1]

Which statements about the electrolysis of concentrated copper(II) chloride are correct?
1 Electrons are transferred from the cathode to the copper(II) ions.
2 Electrons move round the external circuit from the cathode to the anode.
3 Chloride ions are attracted to the anode.
4 Hydroxide ions transfer electrons to the cathode.

1 and 3

1 and 4

2 and 3

2 and 4

[Maximum number: 1]

Which statement about electrolysis is correct?

Electrons move through the electrolyte from the cathode to the anode.

Electrons move towards the cathode in the external circuit.

Negative ions move towards the anode in the external circuit.

Positive ions move through the electrolyte towards the anode during electrolysis.

[Maximum number: 1]

A solution of copper(II) sulfate can be electrolysed using copper electrodes or carbon electrodes. Which statements are correct?

1 Using copper electrodes, oxygen gas forms at the anode.
2 Using copper electrodes, copper atoms lose electrons at the anode.
3 Using carbon electrodes, copper metal forms at the cathode.
4 Using carbon electrodes, copper ions gain electrons at the cathode.

1 and 2

1 and 3

2, 3 and 4

4 only

0 selected

Question 1

Question 1(b)

Question 1

Question 1(c)

Question 1

Question 1(b)

Question 9

Question 10

Question 3

Question 3(c)

Question 3(c)(i)

Question 3(c)(ii)

Question 3(d)

Question 3(d)(i)

Question 3(d)(ii)

Question 3(d)(iii)

Question 9

Question 9

Question 9

Question 9