Higher Tier
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Fill in the boxes at the top of this page with your name,
centre number and candidate number.
•• Answer all questions.
Answer the questions in the spaces provided
– there may be more space than you need.
Information
•• The total mark for this paper is 100.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• Inability
the questions marked with an asterisk (*), marks will be awarded for your
to structure your answer logically, showing how the points that you make
are related or follow on from each other where appropriate.
Advice
•• Read each question carefully before you start to answer it.
Try to answer every question.
• Check your answers if you have time at the end.
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, Answer ALL questions. Write your answers in the spaces provided.
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answer, put a line through the box and then mark your new answer with a cross .
1 A bomb calorimeter is used to measure the energy content of a food sample.
Figure 1 shows a bomb calorimeter.
ignition wires
stirrer
water
food
Figure 1
The mass of the food sample is measured at the start.
The food sample is burnt and the temperature rise of the water is measured.
(a) (i) Describe how the temperature rise of the water is measured.
(2)
, (ii) The energy content of the food is calculated using the equation:
mass of water (g) × temperature rise (°C) × 4.2
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energy content (J/g) =
mass of food (g)
The bomb calorimeter was used to find the energy content of a biscuit.
The mass of water was 1 000 g, the temperature rise was 69.4 °C and the mass
of the biscuit was 14.7 g.
Which is the energy content of this biscuit?
(1)
A 291 480 J/g
B 19 829 J/g
C 69 400 J/g
D 4 721 J/g
(iii) A different biscuit with the same mass gave a temperature rise of 78.2 °C.
Give one reason why this biscuit gave a greater temperature rise.
(1)
, (b) Figure 2 shows the equipment used in a school laboratory to measure the energy
content of a food sample.
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Figure 2
Explain why a bomb calorimeter gives a more accurate value than this equipment
for the energy content of a food sample.
(3)
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