Separating Substances

Describe paper chromatography
1. Paper Chromatogarphy can be used to seperate mixture of substances. It can be used to identify substances. The most souable a substance is in the solvent,the further it wil travel up the chromatography paper.
2. You can use paper chromatography for identify substances, seperate mixture of substances, purify a substance by seperating it from its impurities,
3. Rf value =DIstance travelled by the sample/Distance travelled by the solvent
Describe methods of separation and purification: filtration, crystallisation, distillation, fractional distillation
1. Filtration- Used to seperate a solid from a liquid.E.G- Sand and water
2. Crystallisation- A solute from its sloution. E.g- sugar and water
3. Distillation- A slovent from its sloution.E.G- obtain water from a slat water solution.
4. Fractional distillation- Liquids from each other.Eg- ethanol and water
Identify substances and assess their purity from melting point and boiling point information
1. Pure substance- It has a definite and shrp melting and boiling point
2. Impurity- it is a substance have a lower than usual melting point and higher than usual boiling point.
Understand the importance of purity in substances in everyday life, e.g. foodstuffs and drugs
1. The purity of a substance also impacts the chemical properties of a substance by reducing the chances of unexpected products being formed if impurities are present within the substance.
Suggest suitable purification techniques, given information about the substances involved

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Separating Substances

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