10 questions🇬🇧English
⚗️ Separating Mixtures – Year 7
Chemistry · Year 7 (KS3) — filtration, evaporation, distillation and chromatography and when to use each
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Questions
When salt dissolves in water to make salt water, what is the salt called?
The solvent
The solute
The solution
The residue
20s
Which method is best for separating sand from water?
Filtration
Chromatography
Distillation
Evaporation
20s
In filtration, what do we call the solid that is left behind in the filter paper?
The filtrate
The solvent
The residue
The solute
20s
Which method should you use to get pure water from sea water?
Crystallisation
Chromatography
Filtration
Simple distillation
20s
Which method would you use to find out which coloured dyes are mixed in a black felt-tip pen?
Filtration
Distillation
Evaporation
Chromatography
20s
To make copper sulfate crystals, you heat the solution to remove some water. What should you do next?
Add more water to it
Leave it to cool slowly
Pour it into cold water
Filter it straight away
30s
What is the correct order of steps to get pure salt from rock salt?
Grind, dissolve, evaporate, filter
Grind, filter, dissolve, evaporate
Grind, dissolve, filter, evaporate
Dissolve, evaporate, grind, filter
30s
On a chromatogram, a spot moved 4.2 cm and the solvent front moved 6.0 cm. What is the Rf value?
1.4
1.8
0.42
0.7
30s
In a chromatography experiment, one spot stays on the baseline and does not move. What does this tell you?
It has an Rf value of 1
It is a mixture of several dyes
It is insoluble in the solvent
It is very soluble in the solvent
30s
In paper chromatography, why is the baseline drawn in pencil rather than in ink?
Pencil stops the solvent rising
Ink would dissolve and move up the paper
Pencil lines are easier to see
Ink would make the paper too wet
30s