This lesson is intended for lower KS2 pupils who have already learned what the three states of matter are and who are ready to learn the processes of evaporation, condensation and dissolving. The initial teacher demonstration can be done with a kettle and glass (mind your hands!), then show pupils ice melting and sugar/salt dissolving in water. There are then three differentiated worksheets for pupils to demonstrate their understanding of the three processes.

This is a complete practical lesson for lower KS2 on the difference between reversible and irreversible changes. The lesson begins with an open-ended ‘odd one out’ activity intended to engage children’s deeper thinking and elicit appropriate scientific vocabulary and verbal reasoning. Depending on your school’s health and safety policy, you may or may not be able to do the very first teacher demonstration, where you burn a small amount of methylated spirit in a plate (then show them the empty plate after it has burned away!) If not, videos can easily be found on YouTube. For the 3 child-led practical parts of the lesson you will need: olive/sunflower/vegetable oil vinegar (any) sand filter paper funnels Alka-Seltzer tablets (one per pair) or similar There is then a short activity to finish off with - differentiated three ways and with an open-ended extension question to keep any ‘fast finishers’ busy! The plenary activity challenges pupils to use what they have learned to discuss whether a real-world chemical change is reversible or irreversible. Give the blue cards to one partner and the yellow ones to the other. The partners will then have to work together to arrive at a conclusion.