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SECTION B
Answer ALL the questions. Write your answers in the spaces provided.
37 A student predicts that ice cubes will melt faster if they have a larger surface area.
To test this prediction the student makes five ice cubes which each have the same
volume but have different surface areas.
All the ice cubes are made in the same freezer.
(a) Name the piece of equipment that the student should use to measure the volume
of the water used to make the ice cubes.
(1)
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(b) The student takes the ice cubes out of the freezer and places them all on the
same bench.
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They measure the time taken for each ice cube to melt.
(i) What is the independent variable in the student’s investigation?
(1)
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(ii) What is the dependent variable in the student’s investigation?
(1)
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(iii) State one variable that the student controls during this investigation.
(1)
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(c) The table shows the student’s results.
Time taken for ice cube
to melt in minutes
124
50
92
54
80
76
88
71
128
48
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Surface area of ice cube
in cm2
The student has plotted their results on this graph.
80
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70
60
50
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40
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30
20
10
0
28
0
20
40
100
60
80
2
surface area of ice cube in cm
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120
140
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(i) Complete the graph by adding a label to the y-axis.
(ii) Draw a circle around any anomalous results on the graph.
(iii) Draw a line of best fit on the graph.
(1)
(1)
(1)
(iv) Use the graph to predict how long it would take for an ice cube with a surface
area of 100 cm2 to melt.
(1)
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(v) Give one way in which the results could be made more reliable.
(1)
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(Total for Question 37 = 9 marks)
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