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
• In what states can diffusion occur?

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

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

  It diffuses until the water is uniform
• What is the definition of net movement in diffusion?

  Movement of all particles considered together
• What type of membranes allow diffusion?

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

  Small molecules like water and glucose
• Why can't larger molecules diffuse through cell membranes?

  They are too big to fit through
• What does it mean that diffusion is a passive process?

  It doesn't require energy from the cell
• 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 effect does temperature have on diffusion?

  Higher temperatures increase diffusion rate
• How does surface area influence the rate of diffusion?

  Larger surface area increases diffusion rate
• Why would a box with a larger surface area diffuse faster?

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

  • Concentration gradient
  • Temperature
  • Surface area
• What is the overall process of diffusion?

  • Random movement of particles
  • Movement from high to low concentration
  • Results in even distribution over time
• What is the significance of diffusion in biological systems?

  • Essential for nutrient uptake
  • Important for gas exchange
  • Key in waste removal processes