Memory Anchor:

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Key Questions:

1. What is a mixture?
   • A mixture consists of two or more elements or compounds not chemically combined together.
2. What happens to the chemical properties of each substance in a mixture?
   • In a mixture the chemical properties of each substance in the mixture are unchanged.
3. When mixtures are separated by physical processes how does this affect the chemical reactions and substances made?
   • Mixtures separated by physical processes do not involve chemical reactions and no new substances are made.
4. How are mixtures separated using filtration?
   • Mixtures of insoluble solid molcules and liquids can be seperated using filitration. The insoluble solid is unable to pass through filter paper allowing them to be separated from a liquid. For example a when a mixture of sand and water is filtered the sand remains in the filter and the water passes through.
5. How are mixtures separated using crystallisation?
   • Crystallisation can be used to separate a solid that has dissolved in a liquid. The mixture is heated to remove most of the liquid and then left to allow crystals of the solid to form
6. How are mixtures separated using simple distillation?
   • Distillation is a process that can be used to separate a pure liquid from a mixture of liquids. It works when the liquids have different boiling points. Distillation is commonly used to separate ethanol - the alcohol in alcoholic drinks - from water.