Solutions and solubility — Question Bank (Cambridge) — Cambridge IGCSE Physics 0625 Revision Notes & Topical Questions

Cambridge Lower Secondary Stage 8

Question 1
Paper Ref: 0620/23_Summer_2011_Q5

The table gives the solubility of four substances in ethanol and in water.
A mixture containing all four substances is added to ethanol, stirred and filtered.
The solid residue is added to water, stirred and filtered.
The filtrate is evaporated to dryness, leaving a white solid.
Which is the white solid?
solubility in
ethanol water
A insoluble insoluble
B insoluble soluble
Cc soluble insoluble
D soluble soluble

Options:
A
B
C
D
Correct Key: B

Question 2
Paper Ref: 0620/12_Summer_2019_Q3

Which sequence is used to separate a soluble salt from a mixture of a soluble and an insoluble
salt?
A add solvent, heat the mixture, crystallise the mixture
B add solvent, heat the mixture, filter, crystallise the filtrate
C heat the mixture, filter, crystallise the filtrate
D
heat the mixture, filter, add solvent, crystallise the filtrate

Options:
A
B
C
D
Correct Key: B

Question 3
Paper Ref: 5129/11_Summer_2025_Q14

Which statement describes the changes in kinetic energy, movement and bunching of particles
when a solid is heated through a temperature change of 5°C and changes state to become a
liquid?
A
B
Cc
D
The particles lose kinetic energy, slow down and bunch closer together.
The particles gain kinetic energy, move about rapidly and fill up all the available space.
The particles gain kinetic energy, move around and remain bunched together.
The particles gain kinetic energy, slow down and bunch closer together.

Options:
A
B
C
D
Correct Key: C

Question 4
Paper Ref: 5129/12_Summer_2021_Q15

Which row describes the arrangement and movement of particles in solid sodium chloride?
— arrangement movement
random moving rapidly through the solid
random vibrating about a fixed point
regular moving rapidly through the solid
regular vibrating about a fixed point

Options:
A
B
C
D
Correct Key: D

Question 5
Paper Ref: 0620/23_Summer_2015_Q2

A blue solid, X, is soluble in water.
Which method is used to obtain pure solid X from an aqueous solution?
A chromatography
B crystallisation
C filtration
D
neutralisation

Options:
A
B
C
D
Correct Key: B

Question 6
Paper Ref: 0620/12_Summer_2017_Q4

The table shows the solubility of four substances, W, X, Y and Z, in ethanol and in water.
substance solubility in solubility in
ethanol water
Ww insoluble insoluble
xX insoluble soluble
Y soluble insoluble
r4 soluble soluble
Two methods of separation are given.
e method 1: add the substance to ethanol and then filter
e method 2: add the substance to water and then filter
Which substances can be separated from each other by both method 1 and method 2?
A WandX B XandY C XandZ D YandZ

Options:
A
B
C
D
Correct Key: B

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