Chemistry topic one - mixtures




Pure substances consist of only one element or one compound

Mixture - consists of two or more different substances, not chemically joined together


Filtration is used to separate an insoluble solid from a liquid (sand and water)


1. One beaker contains a mixture of solid and liquid, the other contains a funnel with filter paper

2. The solid and liquid mixture is poured into the filter funnel

3. The liquid drips through the filter paper but the solid particles are caught in the filter paper


Crystallisation is used to remove liquid from a mixture and dissolved solid. The liquid evaporates when warmed and leaves the crystals behind 

To obtain large, regularly shaped crystals from crystallisation:

- put the solution in an evaporating basin

- warm the solution by placing the evaporating basin over a boiling water


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