For each question, circle the correct answer.

Question 1

The only type of water that is pure is...

A)distilled water

B)mineral water

C)tap water

D)sea water

Question 2

Sugar dissolves in water because it is...

A)insoluble

B)saturated

C)solid

D)soluble

Question 3

A pupil mixed the following solids into water and stirred until nothing else happened.

Mixture / Solid
A / chalk
B / flour
C / salt
D / sand

Choose the mixture A B C or D that cannot be separated using filtration.

Question 4

A solid can be separated from a solution using...

A)condensation

B)evaporation

C)freezing

D)melting

Question 5

The chemical name for ‘common salt’ is...

A)calcium carbonate

B)copper sulfate

C)potassium nitrate

D)sodium chloride

Question 6

The flow diagram shows how a pupil extracted pure, dry salt from rock salt.

Choose the word that completes the flow diagram.

A)condensation

B)distillation

C)evaporation

D)freezing

Question 7

A pupil extracted 3 g of pure, dry salt from 5 g of rock salt. The mass of salt obtained was less than the mass of rock salt because the rock was removed by...

A)dissolving

B)distillation

C)evaporation

D)filtration

Question 8

A pupil made a salt solution using the following amounts of salt and water.

Mass of salt2 g.

Mass of water8 g.

The mass of the solution formed was...

A)4 g

B)6 g

C)10 g

D)16 g

Question 9

In a salt solution the particles of salt and water are...

A)combined

B)in rows

C)intermingled

D)spread out

Question 10

This method of separation is called...

A)condensation

B)distillation

C)evaporation

D)fractionation

Question 11

The piece of equipment labelled X is called...

A)a condensation tube

B)a condenser

C)an evaporator

D)a round bottomed flask

Question 12

The boiling point of the pure water produced is...

A)0 °C

B)50 °C

C)100 °C

D)150 °C

Question 13

A mixture of different coloured inks can be separated using...

A)chromatography

B)distillation

C)evaporation

D)filtration

Question 14

A spot of black ink was placed on a strip of filter paper. The end of the filter paper was placed in water and left. This is the result.

Choose the pigment A B C or D that is the most soluble in water.

Question 15

Ink X is mixture of colours...

A)1 and 2

B)1 and 3

C)2 and 4

D)3 and 4

Question 16

A solution in which no more solid will dissolve is called...

A)insoluble

B)saturated

C)solubility

D)soluble

Question 17

A pupil slowly mixes salt into 25 cm3 of water until no more will dissolve. The pupil could make more salt dissolve in the solution by...

A)cooling it

B)evaporating it

C)heating it

D)stirring it

Question 18

The table shows the solubility of four different solids at 20 °C.

Solid / A / B / C / D
Solubility per 100 g of water / 11 g / 8 g / 21 g / 2 g

Choose the solid A B C or D that has the highest solubility.

Question 19

Gravel is insoluble in water. The solubility of gravel in 100 g of water at 20 °C is...

A)0 g

B)20 g

C)100 g

D)120 g

Question 20

The table shows the solubility of lead nitrate at different temperatures.

Solid / 10 °C / 30 °C / 50 °C / 70 °C
Solubility per 100 g of water / 44 g / 61 g / 79 g / 98 g

As temperature increases the solubility of lead nitrate...

A)decreases

B)becomes zero

C)increases

D)stays the same

Cambridge Essentials Science  Cambridge University Press 2003, 2006, 2008