year 9 diffusion (simple)

• What is the main topic covered in the 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 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.
• What does it mean that diffusion is a passive process?

  It means that diffusion does not require any 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?

  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, causing them to move faster and diffuse more quickly.
• What is the relationship between surface area and the rate of diffusion?

  The larger the surface area, the higher the rate of diffusion.
• Why would a box with a larger surface area have a higher rate of diffusion?

  More particles can fit around its surface, allowing more particles to diffuse in and out at once.
• What are the three factors that affect the rate of diffusion?

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

  • Molecules move randomly
  • Spread out from high concentration to low concentration
  • Occurs in gases and liquids
  • Can happen through partially permeable membranes