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Science Part 3
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CAMBRIDGE LOWER SECONDARY SCIENCE 8: END-OF-UNIT TEST
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End-of-unit test
Unit 2
1
[4]
Match the terms about dissolving, with their meanings.
a liquid that other substances will
dissolve in

solute
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a mixture in which particles of a
substance (solute) are mixed with
particles of a liquid so that the
substance can no longer be seen
solvent
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insoluble
a substance that is dissolved
solution
describes a material through which
light can pass
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transparent
a substance that will not dissolve
Cambridge Lower Secondary Science 8 – Mary Jones, Diane Fellowes-Freeman and Michael Smyth © Cambridge University Press 2021
3
CAMBRIDGE LOWER SECONDARY SCIENCE 8: END-OF-UNIT TEST
2
Arun adds 20 g of sodium chloride to 100 g of water in a beaker. What will be the
mass of the solution of sodium chloride that is formed? Tick ( ✓) the correct answer.
[1]
100 g
20 g
120 g
You can’t tell
3
Sofia and Zara are planning to investigate the solubility of two different substances,
A and B, in water. They want to find out which is the most soluble.
[3]
For each pair of statements, tick (✓) the one that will help them to get the most accurate results
and give a reason for your choice.
a
They use the same mass of water for each substance.
They use a different mass of water for each substance.
Because ________________________________________________________________________
b
They carry out the investigation using water at different temperatures.
They carry out the investigation using water at the same temperature.
Because ________________________________________________________________________
c
They count the numbers of spatulas of the substances added to the water.
They measure the masses of the substances added to the water.
Because ________________________________________________________________________
4
Paper chromatography can be used to separate the colours in food dyes or ink.
a
Explain why the colours separate.
[1]
_______________________________________________________________________________
b
When you place the loaded chromatography paper in the solvent, the drop of
solution must be above the level of the solvent. Explain why this is.
[1]
_______________________________________________________________________________
Cambridge Lower Secondary Science 8 – Mary Jones, Diane Fellowes-Freeman and Michael Smyth © Cambridge University Press 2021
4
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