Edexcel GCSE Chemistry Topic 2 States of matter and mixtures overview quiz quiz

Far apart and moving quickly in all directions, with no fixed arrangement at all

Randomly arranged but close together, able to flow around each other freely

Joined together in pairs that are held by strong chemical bonds

Close together in a regular pattern, vibrating about fixed positions

Boiling

Condensing

Freezing

Sublimation

A mixture melts at a single sharp temperature

A mixture melts over a range of temperatures

A mixture does not melt

A mixture melts at exactly 0 degrees Celsius

Filtration through paper

Paper chromatography

Crystallisation

Decanting the liquid off

Filtering out any insoluble solids that are suspended in the liquid mixture

A chemical reaction to take place between all of the different liquids in the mixture

The removal of dissolved gases only, leaving the liquids completely unchanged

Repeated evaporation and condensation to separate liquids with close boiling points

The paper

The solvent

The dissolved substances

The beaker

$0.40$

$0.90$

$1.11$

$1.4$

Pencil is brightly coloured and shows up clearly on the paper

Pencil reacts chemically with the solvent as it rises

Pencil is insoluble and will not move in the solvent

Pencil dissolves so it can mark the solvent front

It is a mixture of two substances

The solvent was too weak

The Rf value is greater than 1

It is a pure substance

Water that is safe to drink but contains some dissolved substances

Completely pure water that contains only H2O and nothing else at all

Sea water that has not yet been treated or filtered in any way

Water that is used only in industry and never for drinking

Adding sand to the water to trap the microbes inside it

Treating with chlorine, ozone or ultraviolet light

Boiling away all of the water until none is left

Adding more dissolved salts to the water supply

Gas particles are much larger and far heavier than the particles found in a solid block of material

Gas particles do not move at all, so they can be squashed together easily

There is a lot of empty space between gas particles, but solid particles are already touching

Solids contain no particles, so there is nothing there to compress