Question

Relate states of matter with heat by a proper graph and describe the graph fully by your
own words.

Answer 1

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.
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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.
Once the solid has melted, the added heat goes into warming up the liquid. You get the green line in the graph.
At another point, the liquid will boil. You reach a second plateau where the temperature remains constant as long as both liquid and gas are present. The heat energy is used to convert the liquid into a gas. Again, the temperature does not change.
Once the liquid has disappeared, the added heat goes into warming up the gas. You get the red line in the graph.

Answer 2

An increase in temperature leads to an increase in absorbed heat which in turn leads to a change in state of the substance/matter.  

From the graph attached below the increase in temperature causes the change in state of the matter ( i.e. water from solid to a gaseous state ), while the plateau represents the transition phase it also indicates the exact temperature wherein the substance changes from one state to another. as the temperature increases the substance absorbs more heat which leads to its change in state.

Attached below is a graphical representation describing the change in state of a substance ( water )

From the graph we can conclude that an increase in temperature leads to an increase in absorbed heat which in turn leads to a change in state of the substance.

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