IGCSE Coordinated Chemistry Workout 33

The Haber process is used to make ammonia. Which statement about the Haber process is not correct?

• A vanadium (V) oxide catalyst is used.

• The nitrogen used is obtained from the air.

• The pressure used is 200 atmospheres.

• The temperature used is 450°C.

Why do farmers add lime to soil?

• It acts as a fertiliser.

• It adds nitrogen to the soil.

• It decreases the pH of the soil.

• It increases the pH of the soil.

Which substance is not a product of an addition reaction of ethene?

• A

• B

• C

• D

Which statement about a protein is not correct?

• It can be hydrolysed by acids and by alkalis.

• It is a natural macromolecule.

• It is made from only one monomer.

• It possesses the same amide linkages as nylon.

The dyes in a sweet are separated using chromatography. Which dyes are present in the sweet?

• 1 and 2

• 1 and 3

• 2 and 4

• 3 and 4

Which covalent molecule contains the most shared pairs of electrons?

• CH₄

• CO₂

• C₂H₄

• NH₃

Molten zinc bromide and aqueous zinc bromide are electrolysed using inert electrodes. In which rows do the electrode products match the electrolyte?

• 1 and 3

• 1 and 4

• 2 and 3

• 2 and 4

Aqueous sodium thiosulfate reacts with dilute hydrochloric acid. Increasing the temperature of the reactants increases the rate of reaction. Which statement explains this observation?

• The particles are closer together and collide more frequently.

• The particles are closer together and collide with more energy.

• The particles have a greater surface area and collide more frequently.

• The particles have more energy and collide more frequently.

Some properties of gas Y are listed.

1 It burns to produce only one product.

2 It has no effect on damp litmus paper.

3 It is a covalent compound containing two different elements.

What is gas Y?

• carbon dioxide

• carbon monoxide

• chlorine

• methane

Element Y is in Group VI and Period 5 of the Periodic Table.

Which row describes Y?

• A

• B

• C

• D