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This video, from Teachers TV, suggests ways to introduce children to the subject of materials, separating mixtures and irreversible or reversible change. Part of the Great Lesson Ideas series, it contains these ideas for lessons:

An irreversible change
How to create an irreversible change to materials and use the activity to help children improve their prediction skills.

Alien soup
A mixture made of sand, rice and other mystery ingredients can encourage children to work together to filter and separate materials while discovering their properties.

The snowman's coat
Investigates the properties of ice, melting and insulation in an activity inspired by the story of the Snowman's Coat.

Unexpected outcome
Looks at floating and sinking by observing raisins in lemonade. It encourages children to think like scientists when faced with an unexpected outcome.

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