Question

How will you show that air is necessary for the combustion?

Answer 1

if we burn anything in vaccum it will extinguish
in this way we can prove

Answer 2

Aim:

To show that oxygen (air) is necessary for combustion.

Materials Required:

Two candles, a match box and a glass jar. Theory Combustion is a chemical reaction in which a combustible substance burns in air (oxygen) to produce Carbon dioxide , water and heat.

Combustible substance (Fuel) + 0,— CO, + Water + Heat

Procedure:

(i) Light two candles and fix them on the table.

(ii) Cover one of the candles by an inverted glass jar.

Observations:

Candle covered by glass jar extinguishes due to the absence of air while the other candle keeps on burning because it is getting regular supply of oxygen (air). Conclusion Oxygen (air) is necessary for the combustion process.