Luke recorded his results in a table as shown below.
beaker
volume of water,
in cm3
temperature at start, in °C
temperature after
2 minutes, in °C
A
25
18
30
B
50
18
24
C
75
18
22
(a) Why did Luke need to know the temperature of the water at the beginning and at the end of the experiment?
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1 mark
(b) Did Luke’s results support his prediction? Explain your answer.
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1 mark
(c) Luke stirred the water during the experiment. How did this make his results more reliable?
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