Practice Rivers (4.2) - Interphase Mass Transfer – Application to Environmental Interfaces

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9 questions

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Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is molecular diffusion?
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It relates to concentration gradients.
Question 2.
Define bulk flow.
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Think of moving water in a river.
3Question 3.
What is molecular diffusion?
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Think about gradients.
4Question 4.
True or False: In a river, diffusion is the most significant transport mechanism.
- True
- False
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Consider the flow of water.
Question 5.
Calculate the time required for a pollutant to diffuse from one end of a 100 m lake to the other, assuming a diffusion coefficient of 1.0 x 10^-5 m^2/s.
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Use the formula for diffusion time.
Question 6.
Discuss the environmental implications of relying solely on diffusion for pollutant transport in an unsaturated soil layer.
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Think about pollutant persistence in time.

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