At the end of this unit
in terms of scientific enquiry
most pupils will: make measurements of temperature and mass; present experimental results as line graphs, pointing out patterns; describe observations and explain these; identify patterns in data about solubility, and make predictions from these; interpret data from chromatograms; use scientific knowledge and understanding to plan how to separate pure salt from rock salt
some pupils will not have made so much progress and will: make measurements of temperature and mass; produce simple line graphs of results and point out patterns in these; separate a sample of salt from rock salt
some pupils will have progressed further and will: make measurements of temperature and mass; interpret and explain the significance of data from chromatograms; evaluate their method for obtaining pure salt in terms of the mass obtained
in terms of materials and their properties
most pupils will: classify some solids as soluble or insoluble and explain the meaning of the term 'saturated solution'; describe how mixtures can be separated by distillation and chromatography and begin to use the particle model to explain what happens when a solid dissolves in water, explaining why mass is conserved
some pupils will not have made so much progress and will: name some soluble and insoluble solids; describe how pure water can be obtained from sea water and how different colours can be separated from some inks
some pupils will have progressed further and will: use the particle model to explain a range of phenomena
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