Science KS 3 Unit 7H Solutions

In this unit pupils:

• extend their knowledge of dissolving and the separation of the components of a solution and relate this to particle theory.
• begin to distinguish between a 'pure' substance and a mixture.
• apply the particle model of solids, liquids and gases in a range of contexts.

In scientific enquiry pupils:

• make measurements of temperature and mass.
• describe and interpret patterns in graphs and chromatograms.
• make predictions from graphs and data about solubility.
• investigate how a sample of pure salt can be obtained from a sample of rock salt, evaluating the method in terms of salt obtained.


This unit is expected to take approximately 8 hours.

OTHER RESOURCES

• prepared data about:
• the solubility of different solids in water
• the solubility of solids in different solvents
• the variation of solubility of solids in water with temperature (as tables and graphs)
• chromatograms for interpretation
• software simulation of particles in mixtures
• secondary sources showing uses of chromatography, eg caffeine determination in drinks, identifying traces of photoallergens (causing irritation) in germicides and soaps, identification of sugars in urine, identification of traces of drugs in horses