2.1. Molecular Diffusion

Try these first

1. 1.

   Define molecular diffusion.

   Hint

   Think about concentration gradients.

2. 2.

   What does bulk flow refer to?

   Hint

   Consider what happens when water flows.

3. 3.

   What is molecular diffusion?

   • Movement due to temperature differences
   • Movement from high to low concentration
   • Movement due to external forces

   Hint

   Focus on what drives the movement.

4. 4.

   True or False: Diffusion stops occurring at equilibrium.

   • True
   • False

   Hint

   Think about what equilibrium means.

5. 5.

   A chemical is released into a deep lake with no wind. Describe how the pollutant will spread over time and the mechanisms involved.

   Hint

   Consider the effects of water movement on diffusion.

6. 6.

   In groundwater with slow movement, pollutants are tracked from a source to a well. Explain how molecular diffusion plays a role in this scenario.

   Hint

   Think about the driving factors for mass transport in low flow rates.