Diffusion

• What is the main topic of the video discussed?

  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 when they are left alone?


  They move about randomly and spread out over time.
• How does the concept of net movement relate to diffusion?


  Net movement refers to the overall 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 is a partially permeable membrane?


  A membrane that allows only some molecules to diffuse through it.
• Which types of molecules can generally diffuse through cell membranes?


  Very small molecules like water, glucose, and amino acids.
• 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 concentration gradient?


  The difference in concentration between two places.
• How does a larger concentration gradient affect the rate of diffusion?


  The larger the concentration gradient, the higher the rate of diffusion.
• How does temperature affect the rate of diffusion?


  Higher temperatures give particles more energy, resulting in faster diffusion.
• What is the relationship between surface area and the rate of diffusion?


  The larger the surface area, the higher the rate of diffusion.
• If two boxes have the same volume but different surface areas, which will have a higher rate of diffusion?


  The box with the larger surface area.
• 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
  • Larger molecules cannot diffuse
• What is the significance of diffusion in biological systems?


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