Question

A student takes some water in a beaker and heats it over a flame for determining its boiling point. He keeps on taking its temperature readings. He would observe that the temperature of water:

(1) keeps on increasing regularly

(2) keeps on increasing irregularly

(3) first increases slowly, then decreases rapidly and eventually becomes constant

(4) first increases gradually and then becomes constant

Answer 1

Answer:

the student observes that first the temperature increases gradually and then becomes constant .(2marks)

Answer 2

The students observe that temperature increases gradually and then becomes constant .

Explanation:

It is a matter of fact that, the temperature increases till the substance is in its original state. When it gets transformed from one state to another, the temperature becomes constant.

In the case give, the student is continuously heating the water and recording his observation related to change in temperature. Up to the water reaches its maximum boiling point which is 100℃, the temperature keeps on increasing gradually. Once it reaches it, it remains constant as the liquid water starts to become vapor.