LEVEL 10 CHEMISTRY UNIT 12 TEST PG

A method used to make copper (II) sulfate crystals is shown.

What are the purposes of step 3 and step 4?

• to ensure all of the acid has reacted ; to obtain solid copper(II) sulfate

• to speed up the reaction ; to obtain solid copper(II) sulfate

• to speed up the reaction ; to remove excess copper(II) oxide

• to ensure all of the acid has reacted ; to remove excess copper(II) oxide

What is the correct sequence of steps for the preparation of a pure sample of copper(II) sulfate crystals from copper(II) oxide and sulfuric acid?

• dissolving → crystallisation → evaporation → filtration

• dissolving → evaporation → filtration → crystallisation

• dissolving → filtration → crystallisation → evaporation

• dissolving → filtration → evaporation → crystallisation

Salts can be made by adding different substances to dilute hydrochloric acid. For which substance could any excess not be removed by filtration?

• copper(II) oxide

• magnesium

• sodium chloride

• zinc hydroxide

Four stages in the preparation of a salt from an acid and a solid metal oxide are listed.

In which order should the stages be carried out?

• 1 → 3 → 4 → 2

• 2 → 1 → 3 → 4

• 4 → 1 → 3 → 2

• 4 → 2 → 1 → 3

A salt is produced in each of the following reactions.

Which statements about the products of the reactions are correct?

1. 1. A flammable gas is produced in reaction P.

2. 2. Water is formed in all reactions

3. 3. All the salts formed are soluble in water.

• 1, 2, and 3

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

Zinc sulfate is a soluble salt and can be prepared by reacting excess zinc carbonate with dilute sulfuric acid.

Which piece of equipment would not be required in the preparation of zinc sulfate crystals?

• beaker

• condenser

• evaporating dish

• filter funnel

Four steps to prepare a salt from an excess of a solid base and an acid are listed.

In which order are the steps carried out?

• neutralisation → filtration → evaporation → crystallisation

• filtration → neutralisation → evaporation → crystallisation

• evaporation → filtration → neutralisation → crystallisation

• crystallisation → evaporation → filtration → neutralisation

Which method is used to make the salt copper sulfate?

• dilute acid + alkali

• dilute acid + carbonate

• dilute acid + metal

• dilute acid + non-metal oxide

Which two processes are involved in the preparation of magnesium sulfate from dilute sulfuric acid and an excess of magnesium oxide?

• neutralisation and filtration

• neutralisation and oxidation

• thermal decomposition and filtration

• thermal decomposition and oxidation

How many different salts could be made from a supply of dilute sulfuric acid, dilute hydrochloric acid, copper, magnesium oxide and zinc carbonate?

• 3

• 4

• 5

• 6