Here you are! some links to practise at home:
- http://www.fossweb.com/modulesK-2/SolidsandLiquids/activities/changeit.html
- http://www.crickweb.co.uk/ks2science.html#changingstate
- http://www.bbc.co.uk/schools/scienceclips/ages/9_10/changing_state.shtml
- http://www.bbc.co.uk/schools/scienceclips/ages/10_11/rev_irrev_changes.shtml
Enjoy!