Practice Equations For Chemical Mass In Liquid System (5) - Release from Sediments

Practice: Equations for Chemical Mass in Liquid System

Lesson 5Release from Sediments

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11 questions

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6 sample questions

Question 1.
Define mass balance in terms of chemical systems.
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Think about how you account for resources in a closed system.
Question 2.
What does porosity refer to?
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Consider what allows water to pass through soil.
3Question 3.
What does the term 'mass balance' refer to in sediment systems?
- Tracking mass over time
- Chemical reaction rates
- Solid volume measurements
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Consider how flow can impact mass tracking.
4Question 4.
True or False: Effective diffusivity is the same as regular diffusivity.
- True
- False
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Think about why diffusion might slow down in porous media.
Question 5.
Consider a hypothetical sediment system with a high porosity of 0.5 and a diffusivity of 1 × 10^-5 m²/s. Calculate the effective diffusivity using Millington-Quirk's equation.
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Use the formula correctly, remembering to calculate φ raised to the power.
Question 6.
Construct a mass balance equation for a contaminated river sediment. Assume the sediment has 10% saturation with a contaminant concentration of 200 mg/L and assess the risk of leaching.
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Pay attention to how leaching would be calculated in your mass balance.

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