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

AWhy did Luke need to know the temperature of the water at the beginning and at the end of the experiment?

.....................................................................................................................

.....................................................................................................................

1 mark

BDid Luke’s results support his prediction? Explain your answer.

.....................................................................................................................

.....................................................................................................................

1 mark

CLuke stirred the water during the experiment. How did this make his results more reliable?

.....................................................................................................................

.....................................................................................................................