Diffusion

• What is the main topic covered in today's video?

  Diffusion
• What is diffusion?

  Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration.
• What happens to molecules if they are left alone?

  They move about randomly and spread out over time.
• If a group of molecules is bunched up together, what will happen over time?

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

  Net movement refers to the movement of all particles considered together as a group.
• Can diffusion occur in both gases and liquids?


  Yes, diffusion can happen in both gases and liquids.
• What is an example of diffusion in gases?

  Spraying perfume in a room.
• What is an example of diffusion in liquids?

  Adding food coloring to a beaker of water.
• What type of membranes allow diffusion to occur?

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

  Generally, only very small molecules like water, glucose, and amino acids can diffuse through.
• Why can't larger molecules diffuse through cell membranes?

  Because they are too big to fit through the membrane.
• Is diffusion an active or passive process?


  Diffusion is a passive process.
• What is the first factor that affects the rate of diffusion?

  The concentration gradient.
• How does a larger concentration gradient affect the rate of diffusion?

  The larger the concentration gradient, the higher the rate of diffusion.
• What is the second factor that affects the rate of diffusion?

  Temperature.
• How does temperature affect the rate of diffusion?

  Higher temperatures give particles more energy, causing them to move faster and diffuse more quickly.
• What is the third factor that affects the rate of diffusion?

  Surface area.
• How does a larger surface area affect the rate of diffusion?

  The larger the surface area, the higher the rate of diffusion.
• What are the three factors that affect the rate of diffusion?

  • Concentration gradient
  • Temperature
  • Surface area
• How does diffusion occur in cell membranes?

  • Diffusion through partially permeable membranes
  • Only small molecules can pass (e.g., water, glucose, amino acids)
  • Larger molecules cannot pass (e.g., proteins, starch)
• What is the significance of diffusion being a passive process?

  • No energy is required from the cell
  • Results from random movement of particles
• How does the concentration gradient influence diffusion?

  • Larger concentration gradient = higher rate of diffusion
  • Smaller concentration gradient = lower rate of diffusion
• How does temperature affect particle movement in diffusion?

  • Higher temperature = more energy for particles
  • Faster movement leads to quicker diffusion
• Why is surface area important in diffusion?

  • Larger surface area allows more particles to diffuse at once
  • Increases overall rate of diffusion