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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

Offline lesson plan


Identify the changing states of water, water vapour and ice in the context of the water cycle, and understand that these are reversible changes.

National Curriculum

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

Wales: Key Stage 2, Materials and their properties, 2.1, 2.2, 2.6, 2.8

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

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

Resources required

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

Large diagram or picture of the water cycle

Teaching activities

Ask children to tell you what they know about the three states of matter: gas, liquid, and solid. Use ice, water and water vapour as examples. Elicit that materials can change state when heated or cooled. Ask questions around this idea. Who steals the puddles from the playground after it rains? Display the picture of the water cycle. Referring to the picture, talk through the different stages of the water cycle. Ensure use of the correct vocabulary (melt, freeze, evaporate, condense). Explain the change of ice to water is melting, water to ice is freezing, water to water vapour is evaporation, and water vapour to water is condensation.

Hand out copies of the worksheet, one per child. For more able children, you could cut off the word bank at the bottom of the worksheet. Talk children through the worksheet. Tell them they must name and describe the processes that occur to change ice into water, water into water vapour and vice versa. Once children are confident they know what to do, let them complete the worksheet independently.

Ask the children to describe the changes that occur when water is heated or cooled. Ensure the correct terms are used. Ask children to explain the water cycle using the correct terms. Prompt with questions. Is there a starting point in the cycle? Where does evaporation occur in the water cycle? Where does condensation occur in the water cycle? Where does freezing fit into the water cycle? What role does the sun play in the water cycle?


Imagine you are a drop of water in the sea. Write a story about the changes of state (water, water vapour and ice) you go through in the context of the water cycle. This can be complete with a diagram.

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.


Resources for teachers

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