Free Printable Separating mixtures for yr 8

Worksheets

Separating mixtures for yr 8

Total questions: 20

Worksheet time: 16mins

Name

Class

Date

Two or more substances mingled together, but not chemically combined are known as a

residue

solution

distillate

mixture

Sand and gravel may be separated from each other through using..

a filter funnel

a sieve

an evaporating basin

a distillation

Which of the following pairs of substances may best be separated through distillation

sand and soil

water and soil

salt and sand

water and alcohol

Which one of the following techniques would best be used to separate soil and water?

Decanting

distillation

Filtration

Chromatography

Sodium chloride can be separated from rock salt by first adding water to the mixture to dissolve the sodium chloride. The separation then takes place in two stages:

evaporation followed by filtration

distillation followed by decanting

filtration followed by evaporation

filtration followed by decanting

Which one of the following would you use to separate sand from iron filings?

a bar magnet

filter paper

chromatography paper

alum

Water and alcohol are easily separated by distillation because of their

different melting points

different colours

different densities

different boiling points

Which one of the following is NOT a mixture?

Sugar

Paint

Crude oil

Air

Which mixture could you separate by adding water and then pouring through a coffee filter?

sand and salt, because the salt would dissolve and the sand would not

baking soda and salt, because they both dissolve

sugar and salt, because they both dissolve

iron fillings and sand, because neither one dissolves

10.

A pure substance shows ------------------ spot on chromat gram

11.

What key term is used to describe when a solute does not dissolve in water?

Soluble

Solute

Insoluble

Solution

12.

What does the picture illustrate? Think carefully as they are coloured!

Solution

Solute

Solvent

13.

When no more sugar will dissolve in a glass of water, the solution is

unsaturated

saturated

supersaturated

suspended

14.

1.What is the name of the process to separate a soluble substance from a solution?

Filtration

Crystallisation

Sieving

15.

Chromatography can be used to separate a mixture of...

Different inks.

Salt and water.

Water and sand.

Water and ethanol.

16.

A pure substance shows ------------------ spot on chromatogram

17.

The diagram below shows a chromatogram obtained when a sample X was analysed together with four other known dyes P, Q, R and S. Dye Q was known to cause cancer. Which of the following dye(s) is/are safe for use?

P only

S only

P and S

P and X

18.

A substance is soluble if it can be dissolved.

In paper chromatography, the most soluble solute _____________________ .

does not move from the start point

stays closest to the start point

travels furthest away from the start point

can be found in the middle of the chromatogram

19.

In the image, which dye is the most soluble?

Red

Blue

Purple

20.

Ink can be separated by a method of -----------------------------------------------

distillation

filtration

chromatography

sedimentation

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Separating mixtures for yr 8

Total questions: 20

Worksheet time: 16mins

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