1.13 - Diffusion

• What is diffusion?

  Diffusion is the net movement of particles from an area of high concentration to an area of low concentration
• True or False? If molecules are left alone they’ll move around randomly.

  True
• Which states can molecules diffuse?

  Liquid

  Gas
• Cell membranes are said to be partially permeable. What does this mean?

  Only some molecules can pass through the membrane
• Which molecules are able to diffuse into and out of cells?

  Glucose

  Water

  Amino Acids
• List three factors that affect the rate of diffusion.

  Concentration gradient

  Temperature

  Surface Area
• Will a larger surface area increase or decrease the rate of diffusion?

  Increase
• Why does a higher temperature increase the rate of diffusion?

  Higher temperatures means particles have more kinetic energy so they move faster and can diffuse faster.