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2.17 Diffusion and osmosis investigations
Exam question
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A potato cylinder had a mass of 2.50 g at the start. After 30 minutes in pure water its mass was 2.80 g. Calculate the percentage change in mass.
(2)Total for this question: 2 marks
2.17 Diffusion and osmosis investigations
Exam question
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A potato cylinder of mass 3.20 g was placed in 1.0 mol/dm³ sucrose solution. Its final mass was 2.62 g. Calculate the percentage change in mass.
(2)Total for this question: 2 marks
2.17 Diffusion and osmosis investigations
Exam question
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A piece of carrot of mass 4.00 g was left in 0.2 mol/dm³ salt solution and its mass became 4.18 g. Calculate the percentage change in mass.
(2)Total for this question: 2 marks
2.17 Diffusion and osmosis investigations
Exam question
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Visking tubing containing sugar solution had a mass of 12.5 g. After an hour in water its mass was 14.1 g. Calculate the percentage change in mass.
(2)Total for this question: 2 marks
2.17 Diffusion and osmosis investigations
Exam question
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A beetroot disc of mass 1.60 g lost water in a concentrated salt solution until its mass was 1.38 g. Calculate the percentage change in mass.
(2)Total for this question: 2 marks
2.17 Diffusion and osmosis investigations
Exam question
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Describe how to investigate osmosis using potato cylinders and sucrose solutions.
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Total for this question: 4 marks
2.17 Diffusion and osmosis investigations
Exam question
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Explain why the potato cylinders are blotted dry before they are weighed.
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Total for this question: 2 marks
2.17 Diffusion and osmosis investigations
Exam question
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Explain why percentage change in mass is calculated rather than change in mass.
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Total for this question: 2 marks
2.17 Diffusion and osmosis investigations
Exam question
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Explain how the results of a potato osmosis experiment can be used to estimate the concentration of the potato cell sap.
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Total for this question: 3 marks
2.17 Diffusion and osmosis investigations
Exam question
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Explain why a potato cylinder in pure water gains mass.
(2)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: 2 marks
2.17 Diffusion and osmosis investigations
Exam question
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Explain why a potato cylinder in a concentrated sucrose solution loses mass.
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Total for this question: 2 marks
2.17 Diffusion and osmosis investigations
Exam question
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Describe how Visking tubing can be used to show osmosis.
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Total for this question: 3 marks
2.17 Diffusion and osmosis investigations
Exam question
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Explain why Visking tubing is used as a model of a cell membrane.
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Total for this question: 2 marks
2.17 Diffusion and osmosis investigations
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Describe an experiment to show diffusion using agar containing an indicator.
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Total for this question: 3 marks
2.17 Diffusion and osmosis investigations
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Suggest two variables to control when investigating osmosis in potato cylinders.
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Total for this question: 2 marks
