SB8B

• Concentration


  amount of a substance in a certain volume
• concentration =


  mass of solute (g)/ volume of solution (dm3)
• the number of particles decreases as you go down a concentration gradient
• the steeper the gradient, the faster the rate of diffusion, as the particles are closer together and can move faster
• the steeper the concentration gradient, the faster the rate of diffusion.
• diffusion goes from highest to lowest
• if membrane thickness is increased, the rate of diffusion is increased as the membrane is more resistant to diffusion
• if membrane thickness is increased the rate of diffusion will decrease
• rate of diffusion is the rate at which particles move from an area of high concentration to an area of low concentration
• rate of diffusion is proportional to

  surface area x concentration difference / thickness of membrane
• to keep the rate of diffusion high a steeped concentration gradient must be maintained
• a concentration is the amount of substance in a volume
• concentration = mass of solute (g)/ volume of solution(dm*3)
• the particles in a solution move randomly in all directions