WHAT YOU NEED: vinegar, bicarbonate of soda, a small glass, a teaspoon and a candle.
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STEP 1: Light the candle. REMEMBER: lit candles are a fire risk, so make sure you have an adult with you!
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STEP 2: Pour 100 millilitres of vinegar into a large glass. The vinegar contains ethanoic acid.
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STEP 3: Add a small teaspoon of bicarbonate of soda. The scientific name for this is sodium bicarbonate. The mixture should start to foam as the sodium bicarbonate reacts with the ethanoic acid and produces bubbles of carbon dioxide gas.
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STEP 4: Pour the carbon dioxide onto the flame. The CO₂ gas is heavier than air so pours down onto the burning candle wick. It displaces the oxygen fuelling the flame and puts it out!
