Science Entry Examination Worksheet With Answers - Whitgift School Page 3
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50Whitgift School
Q1.
Harry mixed zinc with copper sulphate solution in a test-tube.
A displacement reaction took place and the temperature increased.
(a)
The word equation for the reaction is shown below.
zinc + copper sulphate → zinc sulphate + copper
Why is this reaction called a displacement reaction?
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1 mark
(b)
Harry repeated the experiment with two other metals.
He wanted to calculate the temperature rise each time.
His results are shown below.
metal added to
temperature at
highest temperature
rise in
copper sulphate
the start (°C)
reached (°C)
temperature (°C)
zinc
20.0
36.5
16.5
iron
25.5
38.5
13.0
magnesium
19.5
87.5
68.0
Harry used different starting temperatures.
Explain why this did not affect his results.
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1 mark
Whitgift School
| 13+ Science Examination - Sample Paper
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