the net movement of molecules from an area of high concentration of the molecules to an area with a lower concentration and require noenergy.
what factors affect diffusion?
concentration gradient - the greater the difference in concentration, the quicker rate of diffusion.
temperature - the higher the temperature, the more kinetic energy the particles will have, so they will move and mix more quickly.
rate of diffusion:
surface area x concentration difference divided by thickness of membrane.
osmosis.
the diffusion of water molecules from a region where they are in higher concentration to a region where they are in lower concentration through a partially permeable membrane and requires no energy.
dilute solution.
contains a high concentration of water molecules.
concentrated solution.
contains a low concentration of water molecules.
active transport.
the movement of dissolved particles into or out of a cell through the cell membrane, from a region of a lower concentration to a region of higher concentration and requires energy.
