Page 68 - ScienceStd4

Experiment 1: Investigating the importance of oxygen gas
in combustion.

Aim: To demonstrate the importance of oxygen gas in
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combustion

Materials: Matchbox, two candles, a transparent container

with one open side or an air-tight jar, a watch and
a table

Procedure

1. Take the two candles and label them A and B.

2. Light both candles.

3. Cover candle B with an inverted air tight jar to seal out air.

4. Observe the results of both candles for one minute.

5. Write the results of your observation for each candle.

Question

Write the reasons for the results of the observation.

Results

Candle A continues to burn because there is enough oxygen
to support the combustion process. The burning of candle B
slows down and eventually goes out due to a lack of sufficient
oxygen to sustain combustion.

Conclusion

The experiment demonstrated that oxygen is essential for
combustion.

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SCIENCE AND TECHNOLOGY STD 4.indd 61 14/01/2025 18:38