purity and separating mixtures c2.1
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- Created on: 06-10-18 21:52
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- purity and separating mixtures (c2.1)
- separating mixtures (c2.1.4 + c2.1.5 + c2.1.6)
- filtration
- separates a solid from a liquid
- insoluble substances forms residue
- soluble substances goes through filter paper
- crystallisation
- produces dry sample of soluble substance
- solution is heated
- solvent is evaporated
- simple distillation
- separates a solvent from a solution
- evaporation then cooling then condensing
- fractional distillation
- separates a liquid from a mixture of liquids
- evaporation then cooling at different temperatures then condensing
- chromotography
- stationary phase
- mobile phase
- substances disturbed between phases
- rf = distance travelled by substance / distance travelled by solvent
- filtration
- formulae (c2.1.1 + c2.1.2)
- relative formula mass (mr)
- empirical formula
- relative atomic mass (ar)
- pure and impure (c2.1.3)
- pure substance
- contains one element or compound
- single sharp melting point
- impure substance
- melts over a range of temperatures
- pure substance
- separating mixtures (c2.1.4 + c2.1.5 + c2.1.6)
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