Background information Year 7, unit 1: Mixing and separating

Additional information for teachers Background information year 7, unit 1: Mixing and separating Mixtures When two or more kinds of matter are put together a mixture is formed. The process of being mixed does not change the components of a mixture and they retain their individual properties. Mixtures are combinations of substances that are not combined chemically. The amounts of substances in a mixture can vary. Students should understand that mixtures can change in appearance but this does not mean that the chemical composition of any of the substances has changed.

Additional information for teachers Sieving in cooking • Removing rice or pasta from cooking water. • Sifting flour or other ingredients. • Separating an egg. • Washing lettuce in a salad spinner. Other separation techniques not seen in the home Distilling • Distillation of alcohol. • …

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