Max Lee
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Pure substance
Made up of one element
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How to test for pure substance
Measure their boiling and melting point as pure substances have fixed points
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Formulation and 3 examples
Complete mixture designed to be a useful product such as paints, medicines and cleaning products
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Paper Chromatography
Draw a pencil line on paper
and put several different coloured dots not the line
put the bottom of the paper in the solvent
the solvent makes it way up the paper dissolving the dots
if there's only one spot we know the colour is pure
if there's multiple spots we know its a mixtur
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What's the stationary and mobile phase
Paper (dont move) and solvent (moves)
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Rf equation
distance moved by substance / distance moved by solvent
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Test for hydrogen
Insert a lighted splint into a test tube maybe containing hydrogen and then if it is hydrogen it will pop and burn rapidly
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Test for oxygen
Insert a glowing splint into a test tube maybe containing oxygen and then if it is oxygen the splint will relight
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Test for carbon dioxide
Using a pipette take some gas from the test tube maybe containing carbon dioxide and bubble the gas into a tube of limewater, repeat several times and if it turns cloudy it is carbon dioxide
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Test for chlorine
Insert damp litmus paper into the mouth of the test tube maybe containing chlorine as chlorine bleaches the paper turning it white
