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Question
The following graph shows the change in temperature of a block of ice when heated. Use the graph to answer the following questions:
- For how many seconds did the ice block have no change in temperature?
- For how long was there a change in temperature?
- After how many seconds of heating did the temperature become constant at 0°C?
- What was the temperature after 25 seconds?
- What will be the temperature after 1.5 minutes? Justify your answer.
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Solution
- In the first 20 s, the ice block have no change in temperature.
- There was a change in temperature from 20 s to 50 s, i.e. 50 – 20 = 30 s.
- Observing the graph, we see that after 50 s of heating the temperature became constant.
- 20°C was the temperature after 25 s.
- Since, the temperature became constant at 100°C after 50 s heating, so the temperature will be 100°C even after 1.5 min.
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