Question

Give an experiment to show that ammonium chloride undergoes sublimation. Wit the help of diagram.
OR
A ball is gently dropped from a height of 20m. If its velocity increases uniformly at the rate of 10/
2
, with what velocity will it strikes the ground? After what time will it strike the ground?

Answer 1

Experiment:

Aim: To show that ammonium chloride undergoes sublimation.

Materials Required: Test tube, Test tube holder, Bunsen burner, A pinch of Ammonium chloride.

Procedure:

1) Take a dry test tube and hold it with a test tube holder and take a pinch of ammonium chloride in it.

2) Heat the test tube using a Bunsen burner.

Observation:

After sometime, the solid ammonium chloride directly changes into its white vapour, without changing into its liquid state. The vapour rises and solidifes on the upper cooler part of the test tube. This solid is known as sublimate.

Conclusion:

This proves that there are substances which can change from solid to gaseous state on heating and vice versa. One of them is ammonium chloride.