Higher Tier
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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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