Fire needs three things: something to burn, oxygen, and a temperature hot enough. Take any one away and it will not burn.
I put cups over candles
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Three cups of different sizes. Which candle will go out first?
I put a match head and a piece of wood on an iron plate and heated it
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No flame touches them. Which will catch first?
There is a fire. How do we put it out?
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Each way of putting out a fire takes away one of the three. Which? Drag each into the right box.
From here things go on the balance
What comes next in middle school · the rules of chemical reactions
Does burning make things vanish?
It is the fire you burnt above. A candle gets smaller as it burns, but steel wool gets heavier. Yet both have met oxygen in the same way. Put them on a balance and you will see.
Burn steel wool: will it get heavier or lighter?
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Switch between steel wool and a candle, and try burning them with a jar over the top.
