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20 October 2014
Schools  >> All subjects for ages 4 - 11 years Science Clips
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Science topics ages 9 - 10
Changing state

Curriculum relevance | Online lesson plan
Offline lesson plan | Worksheet | Activity

Online lesson plan


Investigate the effects of cooling and heating on water

National Curriculum

England: Key Stage 2, Sc1 2f, 2j, 2k; Sc3 2b, 2c, 2d

Wales: Key Stage 2, Materials and their properties, 2.1, 2.2, 2.6, 2.7

Northern Ireland: Key Stage 2, Materials, Change, c

Scotland: 5-14 Guidelines, Science, Changing materials, Level C

Resources required

Online activity from Science Clips website: Changing state

Copies of the Changing state worksheet printed from the Science Clips website

Teaching activities

Ask children to tell you what they know about the three states of matter: gas, liquid, and solid. Elicit that materials can change state when heated or cooled. Ask the children if they can tell you what is used to measure temperature. Show the thermometer and discuss the scale and the units (degrees Centigrade). Ask the children if they can remember the freezing point and boiling point of water from previous work. Ask the children to make some predictions. Does the temperature of water increase past 100°C. Does water always freeze at 0°C (pure water does)?

Open the online activity on the interactive whiteboard. Tell the children they are going to find out how to change water between its three states (solid, liquid and gas) by heating and cooling. Show them how to click the Heat or Cool buttons. Show them how to read the temperature at each stage. Ask them to make predictions. Will ice take up more or less room than water? What will happen when the water is heated to 100°C? Will the temperature rise beyond 100°C? Record the questions and the predictions on the board.

Divide the children into groups with a computer for each group. Ask groups to work through the activity, testing the predictions they made earlier.

Ask children to describe the changes they encountered when the water was heated or cooled. Read through their predictions on the board, and ask different children to say if each one was true or false.


Hand out copies of the worksheet, and explain they have to write in the correct words and temperatures to describe the changes in state of water. Let children complete the worksheet independently or in pairs.

Suggested homework

Look out for examples of water vapour, water and ice in everyday situations at home or outside. Make a list to bring into class.


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