Question

explain how changes occur in state of matter and draw the diagram

Answer 1

It can be easily observed by Ice cube which changes its state with respect to time.

Answer 2

If you are adding heat to a sample at a constant rate, you plot the temperature against time.

Temperature is the vertical axis. Time is the horizontal axis. You get a graph like the diagram below.



If you heat the solid, it gradually warms up. You get the blue line in the graph above.

At some point, the solid will melt. You reach a plateau where the temperature remains constant as long as both solid and liquid are present. The heat energy is used to convert the solid into a liquid, so the temperature does not change.