Question

33. An inverted glass jar is placed over a burning candle. After a while, the candle is removed and the inverted glass jar is placed in a trough of water. What do you observe and justify your observations?

Answer 1

• During burning of candle, carbon dioxide $\left({\mathrm{CO}}_2\right)$ and water vapours $\left({\mathrm{H}}_2\mathrm{O}\right)$ are produced in the form of water vapours.
• When an inverted glass jar is placed over a burning candle, the vapours get collected in the inverted jar.
• When the inverted jar is placed in a trough of water, it is observed that the level of water rises after some time.
• This indicates that Carbon dioxide and vapours formed during burning gets dissolved in water and increases the level of water.