Question

The following graph shows the change in temperature of a block of ice when heated. Use the graph to answer the following questions.

(a) For how many seconds did the ice block have no change in temperature?

(b) For how long was there a change in temperature?

(c) After how many seconds of heating did the temperature become constant at 100°C?

(d) What was the temperature after 25 s?

(e) What will be the temperature after 1.5 min? Justify your answer.

Answer 1

(a) In the first 20 s, the ice block have no change in temperature.

(b) There was a change in temperature from 20 s to 50 s, i.e. 50-20 = 30s.

(c) Observing the graph, we see that after 50 s of heating the temperature became constant.

(d) 20°C was the temperature after 25 s.

(e) Since, the temperature became constant at 100°C after 50 s heating, so the temperature will be 100°C even after 1.5 min.