diffusion

• diffusion is the spreading of particles from a high to low concentration
• diffusion

  high to low concentration
• diffusion happens in solutions and gases because particles are free to move randomly
• Where does diffusion occur?

  solution and gases
• why does diffusion occur in such states?

  because particles are free to move
• concentration gradient = difference in concentration
• bigger concentration means a faster diffusion rate
• what would a bigger concentration imply in regards to the rate of diffusion?

  a faster rate of diffusion
• higher temperatures also give faster diffusion rates because particles have more energy so they move faster
• why does diffusion occur faster in warmer temperatures?

  because particles have more energy so they move faster
• | cell membranes

  • they hold a cell together as well as let things in & out
  • dissolved substances move in & out by diffusion
  • only small molecules can diffuse through membrane like oxygen, glucose, amino acids & water
• big molecules like starch and protein cant fit through the membrane
• larger the surface area of the membrane, the faster the diffusion rate as more particles can move at once