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forces of attraction - Coggle Diagram
forces of attraction
Purity substances
Most materials that we use are mixtures, and just a few are pure elements or pure compounds.
In chemistry, a pure substance is a single substance made of only one type of particle.
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dissolving
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If a substance can dissolve into a solvent, it is soluble. If it cannot dissolve, it is described as insoluble.
Heating, stirring and using fine powders are all ways to speed up dissolving.
crystillisation
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When a solution is heated, the solvent evaporates and crystals of the solute are left behind.
filtration
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Filtration usually involves a circle of filter paper folded to make a cone and placed into a filter funnel.
The filtrate is the liquid which passes through the filter paper and the residue is the solid left on the filter paper.
chromotography
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These are often coloured substances such as food colourings, inks, dyes or plant pigments.
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On a chromatogram, one spot means that the substance is pure. An impure substance produces two or more spots.
distillation
Distillation is a separation technique used to separate a solvent from a mixture. For example, water can be separated from salt solution by distillation.
Distillation involves boiling the mixture and then condensing the gas to produce a liquid.