What is burning?, A reaction with oxygen, A change in shape, A type of gas, A kind of liquid, What does burning produce?, Water only, Heat and light, Cold air, Sound only, Why does the candle keep burning?, Fresh air comes in, The jar makes air, The candle makes oxygen, The lid gives air, What happens when we close the jar?, The flame gets bigger, The flame goes out, The candle gets longer, More air comes in, Why does the flame go out?, The glass is clear, The candle is small, The air is used up, The jar is round, Why is the flame unstable with only a bottom gap?, No air enters, The candle is wet, Used air is not replaced, The jar is too large, Which gas helps burning?, Oxygen, Nitrogen, Carbon dioxide, None, About how much oxygen is in air?, 75%, 0.04%, 21%, 50%, About how much nitrogen is in air?, 21%, 0.04%, 50%, 75%, About how much carbon dioxide is in air?, 0.04%, 21%, 75%, 50%

combustion 2

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