Worksheets5.2 Separating mixtures
Total questions: 20
Worksheet time: 10mins
Orange squash is a mixture because:
it is safe to drink.
it always contains the same proportions of each ingredient.
it has a number of different ingredients which can be in different amounts.
it is a single pure substance which cannot be split up.
How can the different liquids in a mixture be separated?
distillation
crystallisation
filtration
chromatography
How could you separate a mixture of iron and sulphur?
filtering
using a sieve
evaporation
using a magnet
The melting point of a pure substance is:
the same as the freezing point.
the same as the boiling point.
lower than the freezing point.
higher than the boiling point.
Which row in the table shows the correct freezing and boiling points for water?
A
B
C
D
If you add impurities to a substance, what happens to the melting and boiling points?
A
B
C
D
Filtering separates:
a liquid from a solution
two solids in a mixture
a solid from a liquid
two liquids in a mixture.
In the apparatus diagram, what is part ‘X’?
filter funnel
filter paper
conical flask
a mistake in the drawing
What does ‘insoluble’ mean?
a solid substance that won’t dissolve in a liquid
a liquid that doesn’t dissolve any solids
a solid substance that dissolves in a liquid
any substance that does not dissolve
What do you see when a solid dissolves in a liquid?
the solid disappears
the solid sinks to the bottom of the liquid
the liquid evaporates
the liquid changes colour
What is a solute?
a liquid that dissolves a solid
a mixture of a solid dissolved in a liquid
a substance that dissolves in a liquid
two liquids that don’t mix together
A solution is saturated with a solid solute. What happens when more solute is stirred into it?
The added solute dissolves.
The added solute disappears.
The added solute evaporates.
The added solute sinks to the bottom.
Sodium chloride has a solubility of 36 g per 100 g of water at 20 °C. Predict its solubility in 100 g of water at 30 °C.
less than 36 g
more than 36 g
36 g
not possible to predict
When a solution of copper sulfate in water is heated to dryness, what is left?
water
blue copper sulfate crystals
white copper sulfate powder
nothing
This chromatogram was made using black ink. How many different coloured inks were in the mixture?
4
6
5
7
What is chromatography used for?
to separate a solid from a liquid
to separate out dissolved solids
to separate a liquid from a solution
to separate a mixture of liquids
Why do the substances separate in a chromatogram?
The solvent dissolves the substances and carries them up the paper.
Some of the substances evaporate before the others.
The solvent carries the substances at different speeds.
The solvent evaporates at different points up the chromatogram.
What is distillation?
evaporating the liquid from a mixture to collect the solid
the separation of a liquid from a mixture using evaporation then condensation
the separation of solutes for analysis
the removal of salt from water
In this distilling apparatus, what is ‘Y’ called?
sausage-shaped tube
conductor
condenser
flask
How does distillation work?
The liquid from a solution is evaporated, and then condensed to collect it.
The liquid from a mixture is condensed, and then evaporated to collect it.
The mixture is heated and then cooled to collect the liquid.
Water is evaporated to steam and then condensed back to water.
