Key Stage 2

Science KS 2 Unit 6D Reversible and irreversible changes (short unit)

This unit brings together and consolidates work that children have done before on reversible changes eg melting, freezing, evaporating, dissolving, condensing, introduces burning as a change that cannot be reversed and, like other irreversible changes, produces new materials. Experimental and investigative work focuses on:

• making careful observations.
• suggesting explanations for observations, using scientific knowledge and understanding.

Work in this unit also offers opportunities for using scientific knowledge and understanding to explain and interpret a range of everyday changes

This unit takes approximately 6 hours

OTHER RESOURCES

• a range of solids which dissolve and which do not dissolve in water eg sand, salt, talc, flour, chalk, bath salts, baking powder
• a range of solids which react with water, lemon juice or vinegar eg washing soda, plaster of Paris, cement, bicarbonate of soda
• real items, or pictures of items, which change when they are heated eg egg, cake mixture, ice, dough, water, chocolate
• materials which burn eg wax, twigs, paper, charcoal
• fire hazard warning labels from furniture