Aim: To show that when compounds combine together chemically, new compounds are formed.
Procedure:
1. Stick two candles on two separate plates using plasticine.
2. Add one teaspoon of baking soda to a glass of vinegar.
3. When bubbles form in the glass, hold a cardboard tube near the flame of one of the candles without touching it.
Observation:
The flame goes out when the cardboard tube is brought near the candle although the other candle continues to burn.
Conclusion:
A new compound, carbon dioxide, is formed.
Explanation:
The bubbles of gas produced are carbon dioxide. When this gas is directed towards the flame, oxygen is being 'pushed away' and it causes the flame to go out. The other candle serves as a control to show that it will continue to burn as it has an uninterrupted supply of oxygen. This is an example of how fire extinguishers work. In this reaction, when baking soda is added to vinegar they react to produce carbon dioxide.
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