What is Diffusion? How Does it Work? What Factors Affect it?

• 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.
• How do molecules behave when left alone?


  They move about randomly and spread out over time.
• What happens to a group of molecules that are bunched up together over time?


  They will slowly spread out until evenly distributed.
• 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?


  Food coloring diffusing in 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?


  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 the rate of diffusion?


  A larger concentration gradient increases the rate of diffusion.
• How does temperature affect the rate of diffusion?


  Higher temperatures give particles more energy, leading to faster diffusion.
• What is the last factor that affects the rate of diffusion?


  The surface area.
• How does a larger surface area influence the rate of diffusion?


  A larger surface area increases the rate of diffusion.
• What are the three factors that affect the rate of diffusion?


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


  • Diffusion occurs through partially permeable membranes.
  • Only small molecules can pass through.
  • It is a passive process that does not require energy.
• What is the relationship between concentration gradient and diffusion rate?


  • A larger concentration gradient results in a higher rate of diffusion.
  • The difference in concentration drives the movement of particles.
• How does temperature affect particle movement in diffusion?


  • Higher temperatures increase particle energy.
  • Increased energy leads to faster movement and higher diffusion rates.
• Why does a larger surface area enhance diffusion?


  • More particles can fit around a larger surface.
  • More particles can diffuse in and out simultaneously.