1.1. Introduction by Prof. Ravi Krishna

Try these first

1. 1.

   What does Fick's law state about the direction of flux?

   Hint

   Think about how on a gradient things flow.

2. 2.

   What happens to diffusion as density increases?

   Hint

   Relate density to movement difficulties.

3. 3.

   What does Fick's first law of diffusion state?

   • A. Flux is directly proportional to concentration gradient
   • B. Flux is inversely proportional to concentration gradient
   • C. Flux is independent of concentration gradient

   Hint

   Think about how substances spread.

4. 4.

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

   • True
   • False

   Hint

   Recall how size impacts movement.

5. 5.

   Given a diffusion coefficient of 0.001 m²/s and a concentration change across a distance of 2 m of 0.5 mol/m³, calculate the expected flux.

   Hint

   Pay attention to units while substituting values.

6. 6.

   Analyze how reducing the temperature of a medium would affect the diffusion of a pollutant in it.

   Hint

   Consider the effect of temperature on molecular motion.