8E
Quick Quiz 2
On your answer sheet, write in the correct letter for each question.
8Ea
1 A mixture is:
A a lot of the same thing put together.
B two things joined together, like flour and
sugar in a baked cake.
C two or more things mixed together, like
nuts and raisins.
D just one substance, like pure salt.
2 Salt seems to disappear if you stir it into
water. Which statement is true?
A The salt dissolves because it is insoluble.
B The salt melts because it is insoluble.
C The salt melts because it is soluble.
D The salt dissolves because it is soluble.
3 When you add salt to water:
A the salt is the solute.
B the water is the solution.
C the salt is the solvent.
D the water is the solute.
4 Filtering cannot be used to separate:
A tea leaves from a pot of tea.
B leaves from a mixture of leaves and
pond water.
C sand from a mixture of sand and water.
D sugar from sugar solution.
8Eb
1 Which is the best explanation of what
happens when sugar dissolves in water?
A The sugar particles stick together.
B The sugar particles split up.
C The water particles split up.
D The sugar particles split up and mix with
the water particles.
Exploring Science
edition
2 You cannot separate a solution by filtering
because:
A the particles of solvent are too big to go
through the holes in the filter paper.
B the particles of solute are small enough to
go through the holes in the filter paper.
C the particles of solvent are small enough to
go through the holes in the filter paper.
D the particles of solute are too big to go
through the holes in the filter paper.
3 You can tell if a solution is saturated because:
A it will be coloured.
B it will be hot.
C it will be transparent.
D there will be bits of undissolved solid in it.
4 Only 20 g of a salt will dissolve in 100 g of
water at room temperature. If you use hot
water instead:
A more than 20 g will dissolve.
B only 20 g will dissolve.
C less than 20 g will dissolve.
D no salt will dissolve.
8Ec
1 Most water has chemicals dissolved in it
because:
A rain water has lots of chemicals dissolved
in it.
B it is pure.
C the water dissolves chemicals from rocks it
passes through.
D the water dissolves chemicals from the
pipes it flows through.
2 A solid dissolved in water can be obtained by:
A freezing the liquid.
B using a sieve.
C using a filter.
D evaporating the liquid
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8E
Quick Quiz 2 (continued)
3 Which of these of these methods cannot be
used to make salt from sea water?
A Filter the sea water then heat it.
B Filter the sea water.
C Heat the sea water.
D Leave a pool of sea water in the sun.
4 Which sentence is not true?
A Rock salt can be used to make pure salt to
put on food.
B Rock salt is a mixture of rock and salt.
C You can get salt from rock salt by
dissolving, filtering and evaporating.
D You can get salt from rock salt using
a sieve.
8Ed
1 Chromatography is:
A a way of separating different dissolved
colours from each other.
B a way of separating different liquids from
each other.
C a way to separate a liquid from a solid that
does not dissolve.
D a special way to draw a graph.
2 Chromatography will only work if:
A the special paper has been warmed before
it is used.
B the chemicals to be separated dissolve in
the liquid used.
C the special paper is moved during the
experiment.
D a lot of each chemical is used.
3 Which of these does not involve
chromatography?
A DNA fingerprinting
B making petrol from oil
C identifying the food dye in orange squash
D identifying paints or inks found at a
crime scene
Exploring Science
edition
4 The diagram shows a chromatogram. Which
two chemicals are the same?
F
D
E
A
B
C
G
A A and B
B C and B
C D and F
D A and G
8Ee
1 Pure water is:
A water which runs off the hills.
B water which is clean enough to drink.
C water with nothing dissolved in it.
D rain.
2 The two steps in distillation are:
A filtering followed by evaporation.
B condensation followed by filtering.
C evaporation followed by condensation.
D filtering followed by condensation.
3 Distillation works because:
A salt particles are dissolved in the water.
B the water particles are too big to
evaporate.
C condensation turns a liquid into a gas.
D only water particles evaporate from a
solution.
4 Distillation cannot be used to:
A make drinking water in emergencies.
B separate sand from sugar.
C make clean water from inky water.
D make pure water from sea water.
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© Pearson Education Limited 2008