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IGCSE Chemistry Extended12.4 Separation and purificationTopic Practice

12.4 Separation and purification

CAIE IGCSE Chemistry Extended 12.4 Separation and purification question practice helps you revise this syllabus point with the course map in view. Use this page to focus on one topic, check the style of questions available, and connect each attempt back to the knowledge area it is testing.

EduNinja keeps Chemistry practice aligned to CAIE at Extended level, so you can move from topic review into exam-style question bank work without losing the syllabus structure. Start with a small set, mark the weak steps, then return to nearby topic links when a definition, graph, calculation, or explanation needs repair.

Question 1

[Maximum number: 2]

Give the name of the process that is used:

Question 1(a)

(a)

to obtain water from aqueous sodium chloride

[ 1 ]

Question 1(c)

(b)

to separate an insoluble solid from a liquid

[ 1 ]

Question 1

[Maximum number: 10]

Substances can be classified as elements, compounds or mixtures.

Question 1(b)

(a)

Mixtures can be separated by physical processes.

A sequence of physical processes can be used to separate common salt (sodium chloride) from a mixture containing sand and common salt only.

Give the order and the correct scientific term for the physical processes used to separate the common salt from the mixture.

1

2

3

The boiling points of four different alcohols, A, B, C and D, are shown.

Table
[ 4 ]

Question 1(c)

(b)

A student suggested that the apparatus shown could be used to separate the mixture of alcohols.

Question image
[ 6 ]

Question 1(c)(i)

(i)

Apparatus X needs to have cold water flowing through it.
- Draw an arrow on the diagram to show where the cold water enters apparatus X.
- Name apparatus X.

[ 2 ]

Question 1(c)(ii)

(ii)

Part of the fractionating column is missing. This means that the experiment will not work.
- Draw on the diagram the part of the fractionating column which is missing.
- Explain why the experiment will not work with this part of the fractionating column missing.

[ 2 ]

Question 1(c)(iv)

(iii)

A hot water bath cannot be used to separate alcohols C and D.

Explain why.

[ 2 ]

Question 1

[Maximum number: 2]

Name the process used to:

Question 1(c)

(a)

separate an insoluble solid from a mixture of an insoluble solid and a solution

[ 1 ]

Question 1(f)

(b)

separate a mixture of several liquids with different boiling points

[ 1 ]

Question 1

Question 1(a)

(a)

State the name of the process that is used to

[ 3 ]

Question 1(a)(i)

(i)

separate oxygen from liquid air,

[ 1 ]

Question 1(a)(iv)

(ii)

obtain water from aqueous sodium chloride,

[ 1 ]

Question 1(a)(v)

(iii)

separate the precipitate formed when aqueous silver nitrate is added to aqueous sodium chloride.

[ 1 ]

Question 1(a)(iii)

[Maximum number: 1]

Give the name of the process that:

is used to separate a mixture of liquids with different boiling points

Question 1

[Maximum number: 2]

Give the name of the process that is used:

Question 1(b)

(a)

to separate nitrogen from liquid air

[ 1 ]

Question 1(d)

(b)

to separate an undissolved solid from an aqueous solution

[ 1 ]

Question 1

[Maximum number: 3]

Give the name of the process that is used:

Question 1(b)

(a)

to separate oxygen from liquid air

[ 1 ]

Question 1(d)

(b)

to separate water from aqueous sodium chloride

[ 1 ]

Question 1(g)

(c)

to separate an aqueous solution from an undissolved solid.

[ 1 ]

Question 1

[Maximum number: 4]

This question is about gases.

Question 1(c)

(a)

Air is a mixture. Nitrogen and oxygen are the two most common gases in air.

[ 4 ]

Question 1(c)(iii)

(i)

Describe the steps in the industrial process which enables nitrogen and oxygen to be separated from clean dry air.

Use scientific terms in your answer.

[ 3 ]

Question 1(c)(iv)

(ii)

Which physical property of nitrogen and oxygen allows them to be separated?

[ 1 ]

Question 2

[Maximum number: 1]

Which method should be used to separate a mixture of two liquids?

A

crystallisation

B

electrolysis

C

filtration

D

fractional distillation

Question 2

Impurities change the melting and boiling points of substances.
Sodium chloride is added to a sample of pure water.
How does the addition of sodium chloride affect the melting point and boiling point of the water?

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