Write an activity to prove oxygen is necessary for combustion.
Answers
Answer:
Activity 1 : Take a candle and fix it on a table. The candle is lighted. The candle will continue to burn due to continuously available fresh air providing the required oxygen for combustion.
Now cover the burning candle by putting an inverted gas jar over it. After a short time, the candle stops burning and gets extinguished. When the burning candle is covered with gas jar, then the candle takes away the oxygen necessary for burning from the air enclosed in the gas jar. After some time, when all the oxygen of air inside the gas jar is used up, then the burning candle gets extinguished. This proves that air is necessary for combustion of substances.
Answer:
fix two small candles of the same length on a table. Light both the candles. Cover one of the candles with an inverted glass tumbler. Observe both the candles carefully.
Do both the candles continue to burn
or go off?
You must have observed that the
candle covered with glass tumbler got
extinguished after some time, whereas
the other candle continued burning.
Explanation:
What can be the reason for this?
Think about it.
It seems that the candle got
extinguished because the component
inside of the glass tumbler, which
supports burning, is limited. Most of the
component is used up by the burning
candles. However, the other candle is
getting continued supply of air. This
component of air, which supports
burning, is known as oxygen.
