diffusion

• name a gas molecule that can diffuse through cell membrane

  oxygen & carbon dioxide
• how does the concentration gradient affect the rate of diffusion?

  the bigger the concentration gradient, the faster the rate of diffusion
• what is diffusion?

  the movement of particles from an area of high concentration to an area of low concentration.

  
• factors affecting the rate of diffusion:

  • Concentration, temperature, and pressure affect the rate of diffusion.
  • Diffusion occurs more quickly when the concentration, temperature, or pressure are high because the particles collide more often.
  • The size and charge of a substance also affect the rate of diffusion.
• how does temperature affect the rate of diffusion?

  the higher the temperature, the faster the rate of diffusion because the particles have more energy so they move around faster
• what is it meant by a partially permeable membrane?

  only allows small molecules can diffuse through it