2.2. Factors Affecting Diffusion Coefficient

Try these first

1. 1.

   What does the negative sign in Fick's Law indicate?

   Hint

   Think about the definition of flux.

2. 2.

   How does temperature affect the diffusion coefficient?

   Hint

   Consider what happens to molecules when heated.

3. 3.

   What effect does the density of a medium have on diffusion rates?

   • Lower density increases diffusion rates.
   • Higher density increases diffusion rates.
   • Density has no effect on diffusion rates.

   Hint

   Consider how gas and liquid densities relate.

4. 4.

   True or False: Increasing molecular weight increases the rate of diffusion.

   • True
   • False

   Hint

   Remember the relationship between size and resistance.

5. 5.

   A warehouse has two chambers, one filled with air and the other with helium. If a small hole connects the two, discuss the rate of diffusion for both gases when released into the chamber.

   Hint

   Consider the molecular weights of both gases.

6. 6.

   In a scenario where a pollutant in water is subjected to increased temperature and viscosity, predict its diffusion behavior and justify your reasoning.

   Hint

   Focus on how both factors interact with each other.