16 exam-style questions · Biology only (B): not in Science (Double Award). Write your answer, check it against the mark scheme and tick the points you earned. Your marks stay on this device. Your writing is not saved.
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2.33B Energy content of a food sample
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A student burned 0.5 g of a peanut under a boiling tube containing 20 cm³ of water. The water temperature rose from 21 °C to 46 °C. Calculate the energy released per gram of a peanut in J/g. (Take each cm³ of water as 1 g; 4.2 J heats 1 g of water by 1 °C.)
(3)Total for this question: 3 marks
2.33B Energy content of a food sample
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A student burned 0.8 g of a corn crisp under a boiling tube containing 25 cm³ of water. The water temperature rose from 19 °C to 37 °C. Calculate the energy released per gram of a corn crisp in J/g. (Take each cm³ of water as 1 g; 4.2 J heats 1 g of water by 1 °C.)
(3)Total for this question: 3 marks
2.33B Energy content of a food sample
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A student burned 1.2 g of a cashew nut under a boiling tube containing 30 cm³ of water. The water temperature rose from 20 °C to 68 °C. Calculate the energy released per gram of a cashew nut in kJ/g. (Take each cm³ of water as 1 g; 4.2 J heats 1 g of water by 1 °C.)
(3)Total for this question: 3 marks
2.33B Energy content of a food sample
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A student burned 0.6 g of a piece of dried pasta under a boiling tube containing 20 cm³ of water. The water temperature rose from 22 °C to 35 °C. Calculate the energy released per gram of a piece of dried pasta in J/g. (Take each cm³ of water as 1 g; 4.2 J heats 1 g of water by 1 °C.)
(3)Total for this question: 3 marks
2.33B Energy content of a food sample
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Explain why the value obtained by burning food under a boiling tube is lower than the value on the food label.
(3)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 3 marks
2.33B Energy content of a food sample
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Suggest three improvements to the burning-food method to reduce heat loss.
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Total for this question: 3 marks
2.33B Energy content of a food sample
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Give three variables that should be kept the same when comparing the energy in different foods by burning them.
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Total for this question: 3 marks
2.33B Energy content of a food sample
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Explain why a student repeats each food three times and calculates a mean.
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Total for this question: 2 marks
2.33B Energy content of a food sample
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Suggest two safety precautions when burning food samples.
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Total for this question: 2 marks
2.33B Energy content of a food sample
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Explain why a crisp gives a higher energy value per gram than a piece of apple.
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Total for this question: 2 marks
2.33B Energy content of a food sample
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| Food | Trial 1 / kJ/g | Trial 2 / kJ/g | Trial 3 / kJ/g |
|---|---|---|---|
| Peanut | 8.2 | 14.5 | 8.9 |
| Bread | 4.1 | 4.4 | 4.2 |
The table shows a student’s results. Comment on the reliability of the results for the peanut.
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Total for this question: 3 marks
2.33B Energy content of a food sample
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A student’s peanut results were 8.2, 8.9 and 8.6 kJ/g. Calculate the mean energy released per gram.
(2)Total for this question: 2 marks
Plan it with CORMMSS: Design an investigation (Logic Lab).
2.33B Energy content of a food sample
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Design an investigation to compare the energy content of three different breakfast cereals.
(6)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 6 marks
2.33B Energy content of a food sample
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Explain why the energy released is calculated per gram of food.
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Total for this question: 2 marks
2.33B Energy content of a food sample
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Identify the dependent variable in an investigation comparing the energy in nuts by burning them.
(1)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 1 mark
