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 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?


  Food coloring diffusing in a beaker of water.
• What type of membranes allow diffusion of some molecules?


  Partially permeable membranes.
• What 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 first factor that affects the rate of diffusion?

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


  A larger concentration gradient increases the rate of diffusion.
• What is the second factor that affects the rate of diffusion?


  Temperature.
• How does temperature influence 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 diffusion?


  A larger surface area allows more particles to diffuse in and out at once, increasing the rate of diffusion.
• What are the three factors that affect the rate of diffusion?


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


  • Net movement of particles
  • From higher concentration to lower concentration
  • Occurs in gases and liquids
• What types of molecules can diffuse through partially permeable membranes?


  • Very small molecules
  • Examples: water, glucose, amino acids
• What is the significance of diffusion being a passive process?


  • No energy required from the cell
  • Driven by random movement of particles