Diffusion

• What is diffusion?

  Net movement of particles from high to low concentration
• What happens to molecules over time if left alone?

  They spread out due to random motion
• What is the definition of net movement in diffusion?

  Movement of all particles considered together
• In which states of matter can diffusion occur?

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

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

  It diffuses until the water is uniform
• 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
• Why can't larger molecules diffuse through cell membranes?

  They are too big to fit through
• Is diffusion an active or passive process?

  Passive process
• What does a larger concentration gradient indicate?

  Higher rate of diffusion
• How does temperature affect the rate of diffusion?

  Higher temperature increases diffusion rate
• What is the relationship between surface area and diffusion rate?

  Larger surface area increases diffusion rate
• Why does a larger surface area facilitate diffusion?

  More particles can diffuse at once
• What are the three factors that affect the rate of diffusion?

  • Concentration gradient
  • Temperature
  • Surface area
• How does diffusion differ in gases and liquids?

  • Diffusion occurs in both states
  • Rate may vary due to particle movement
• What is the significance of random motion in diffusion?

  • Causes particles to spread out
  • Leads to even distribution over time
• What is the role of energy in diffusion?

  • Diffusion is a passive process
  • No energy is required from the cell