Factors Affecting Diffusion

How does distance affect diffusion?

• Shorter the distance the faster the rate
• The bigger the distance the faster the rate
• It doesn't matter - molecules will always diffuse at the same rate

How does the concentration gradient affect diffusion?

• The greater the concentration difference the faster the rate
• The smaller the concentration difference the faster the rate
• The greater the concentration the slower the rate

How does surface area affect the rate of diffusion?

• Greater the surface area the slower the rate 
• Greater the surface area the faster the rate
• Smaller the surface area the faster the rate
• Surface area does not affect diffusion

How does increasing temperature affect the rate of diffusion?

• Increases enzyme activity increasing the rate
• Gives molecules more energy increasing the rate
• Takes energy away from molecules slowing down the rate
• Decreases enzyme activity and decreases the rate

Why is diffusion important?

• Molecules need to be moved out of cells
• Cells need a constant supply of some molecules whilst getting rid of others
• There is no other way of transporting things in or out of a cell
• It requires energy which is always being produced and needs to be used up