What is diffusion? How does it work? What factors affect it?

• What is diffusion?

  Net movement of particles from high to low concentration
• What happens to molecules when they are left alone?

  They move about randomly and spread out
• What is the definition of net movement in diffusion?

  Movement of all particles considered as a group
• In which states of matter can diffusion occur?

  Both gases and liquids
• What happens when you spray perfume in a room?

  It quickly diffuses across the room
• What occurs when food coloring is added to water?

  It diffuses until the water is uniform in color
• What type of membranes allow diffusion?

  Partially permeable membranes
• What types of molecules can generally diffuse through cell membranes?

  Very small molecules like water and glucose
• What is a characteristic of diffusion as a process?

  It is a passive process requiring no energy
• What is the first factor that affects the rate of diffusion?

  The concentration gradient
• How does a larger concentration gradient affect diffusion?

  It increases the rate of diffusion
• What is the second factor affecting diffusion?

  Temperature
• How does temperature influence the rate of diffusion?

  Higher temperatures increase particle movement
• What is the third factor that affects diffusion?

  Surface area
• How does a larger surface area affect diffusion?

  It increases the rate of diffusion
• What are the three factors that affect the rate of diffusion?

  • Concentration gradient
  • Temperature
  • Surface area
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