Rishna took a beaker of water from a refrigerator and heated it up for some time She plotted the graph below to show the temperature changes of water in the beaker for B
minutes.
temperature of water (°C)
70
00
50
40
30
20
)
10
2
time (min)
8
Based on the information above, answer the following questions:
(a) State the following temperatures of water in the beaker:
50
initial temperature
final temperature
[1]
(b) Did the water in the beaker reach its boiling point?
Give a reason for your answer.
40° c
The beaker of boiling water stops boiling and
eventually reaches room temperature.
[1]
(C) Suggest what Krishna did at X.
Give a reason for your answer.
[2]
At the end of the day, Krishna observed that the temperature of the water in the beaker had
stopped decreasing.
(d) Predict the temperature of the water in the beaker.
Give a reason for your answer.
[
1]
Sub-total:
5.
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