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Science Y3/Y4 – Heat – week 2

BURNING SUBSTANCES

Truth to Teach (Source)

To show that most substances need oxygen to burn.

To learn that substances burn at different rates.

To learn that different substances burn at different temperatures.

To learn that when something burns it gives off light and heat.

To learn about putting out fires and the different kinds of extinguisher.

Way to Work (Means)

1. Review the previous lesson.

2. Create a flow chart on the board of information the children may already know about
burning substances. (Define a ‘substance’.) Give leading questions to establish some of
the following points.

Substances burn at
different rates. Substances burn at different
temperatures.

BURNING Substances change when they
SUBSTANCES are burned but they do not
necessarily change when they
are heated.

When something burns
it gives off heat and Most substances require
light. oxygen to burn.

3. Light a candle and ask the children how long they think it will last if a jar is put over
the top. Let them time it with a second timer. Discuss why the flame goes out. (The
oxygen is used up.)

4. Put three candles onto saucers and light them, leaving one in the open air, one under a
small jar and one under a large jar. Let the children predict which will go out first,
second and third explaining why this is so.

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