Properties & Changes of Materials

compare and group together everyday materials on the basis of their properties, including their hardness, solubility, transparency, conductivity (electrical and thermal), and response to magnets 

 know that some materials will dissolve in liquid to form a solution, and describe how to recover a substance from a solution 

use knowledge of solids, liquids and gases to decide how mixtures might be separated, including through filtering, sieving and evaporating 

give reasons, based on evidence from comparative and fair tests, for the particular uses of everyday materials, including metals, wood and plastic 

demonstrate that dissolving, mixing and changes of state are reversible changes 

explain that some changes result in the formation of new materials, and that this kind of change is not usually reversible, including changes associated with burning and the action of acid on bicarbonate of soda