Key stage 2
Key stage 1
To investigate the effects of cooling and heating on water.
Sc1 2f, 2j, 2k; Sc3 2b, 2c, 2d.
- Online activities:
- Learning Zone Broadband Class Clips:
- Other resources:
- Interactive whiteboard
- Computers (one for each group)
You will need Adobe Acrobat reader to access the PDF files. BBC Webwise has a complete guide to downloading and installing Adobe Acrobat reader.
- Watch Learning Zone Class Clips - The behaviour of particles. Ask the children to act like solid, liquid and gas particles in turn.
- Ask the children to explain what they know about gas, liquids and solids, the three states of matter.
- Determine 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 Bitesize changing state game on the interactive whiteboard.
- Explain to the children that they are going to find out how to change water between its three states (solid, liquid and gas) by heating and cooling.
- Show the children how to click the Heat or Cool buttons and how to read the temperature at each stage.
- Ask the children 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 the groups to work through the activity, testing the predictions they made earlier.
- Ask the 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.
- Watch Learning Zone Class Clips - Changing state - water and its contents (to reinforce the learning).
- Ask the children to create a poster in pairs, showing the changes in state and the processes involved.
- Ask the children to complete the changing state worksheet (PDF 454KB) independently or in pairs.
- Explain that they should add the correct words and temperatures to describe the changes in state of water.
- Ask the children to play the Bitesize changing state quiz to assess learning.
- Ask the children to look out for examples of water vapour, water and ice in everyday situations in the home or outside and to make a list of these examples to bring into class.
- Alternatively, ask the children to investigate the water cycle and bring in a picture representing the different changes in state of water.