diffusion

• What is diffusion?

  Net movement of particles from higher to lower concentration
• Why is diffusion considered a passive process?

  It doesn't require energy from the cell
• In which states of matter can diffusion occur?

  Gases and liquids
• What is an example of diffusion in liquids?

  Food coloring in water
• What is an example of diffusion in gases?

  Perfume spreading in air
• What is the term for the movement of all particles considered together as a group?

  Net movement
• Why is the cell membrane described as partially permeable?

  Only some molecules can diffuse through
• Which molecules can diffuse through the cell membrane?

  Water, glucose, amino acids
• What does a larger concentration gradient result in?

  Higher rate of diffusion
• How does temperature affect the rate of diffusion?

  Higher temperature increases the rate
• Why does higher temperature increase the rate of diffusion?

  Particles have more energy and move faster
• How does surface area affect the rate of diffusion?

  Larger surface area increases the rate
• What are the factors affecting the rate of diffusion?

  • Concentration gradient
  • Temperature
  • Surface area
• What is the relationship between concentration gradient and diffusion rate?

  • Larger concentration gradient → Higher rate of diffusion
  • Smaller concentration gradient → Lower rate of diffusion
• What is the relationship between temperature and diffusion rate?

  • Higher temperature → Higher rate of diffusion
  • Lower temperature → Lower rate of diffusion
• What is the relationship between surface area and diffusion rate?

  • Larger surface area → Higher rate of diffusion
  • Smaller surface area → Lower rate of diffusion
• If the concentration gradient between two areas is very small, what would you expect the rate of diffusion to be?

  Low
• If the temperature of a liquid increases, what would you expect to happen to the rate of diffusion?

  Increase
• If the surface area for diffusion is doubled, what would you expect to happen to the rate of diffusion?

  Increase
• What is diffusion?

  Net movement of particles from high to low concentration
• Why does a larger surface area increase the rate of diffusion?

  More area for particles to move through
• What does the term 'net movement' refer to in diffusion?

  Movement of all particles considered as a group
• Why does a higher concentration gradient increase the rate of diffusion?

  Greater difference in concentration drives faster movement
• In which states of matter can diffusion occur?

  Gases or liquids
• Why does higher temperature increase the rate of diffusion?

  Particles have more kinetic energy and move faster
• What is the term for the difference in concentration between two places?

  Concentration gradient
• Which example illustrates diffusion in action?

  Perfume spreading in a room
• What is the term for the movement of particles through a partially permeable membrane?

  Diffusion
• Why can't proteins and starch diffuse through the cell membrane?

  They are too large
• What is another example of diffusion?

  Food coloring in water
• Why can water, glucose, and amino acids diffuse through the cell membrane?

  They are small enough
• If a cell membrane becomes fully permeable, what would you expect to happen to the rate of diffusion?

  Increase
• What is the role of the cell membrane in diffusion?

  It is partially permeable to some molecules
• If the concentration gradient between two areas is very large, what would you expect the rate of diffusion to be?

  High
• Which molecules can diffuse through the cell membrane?

  Water, glucose, amino acids
• If the temperature of a liquid decreases, what would you expect to happen to the rate of diffusion?

  Decrease
• Does diffusion require energy?

  No, it is a passive process
• If the surface area for diffusion is halved, what would you expect to happen to the rate of diffusion?

  Decrease
• What factors affect the rate of diffusion?

  Concentration gradient, temperature, surface area
• Why does a smaller surface area decrease the rate of diffusion?

  Less area for particles to move through