Friday, February 27, 2015

Osmosis and Diffusion



https://www.khanacademy.org/science/biology/cell-division/v/diffusion-and-osmosis

Diffusion: movement of a chemical from high concentration to low concentration against a gradient. (energized by kinetic energy of particles bouncing around to get equilibrium)
  • solvent: higher concentration of a chemical in a mixture (called a "solution") (more of)
  • solute: lower concentrated chemical in a mixture (It has been "dissolved" into the solvent. (less of)

Osmosis: solvent is water because it is polar (and only works in water).  Concentrations of chemical will move to get equilibrium (how cells work in attracting water).
  • In osmosis, the solute chemical is too large to leave the membrane (container) and blocks the solvent from escaping
  • Water can go in and out so it is "semi-permeable".
  • Net effect: more water goes in.  Solute goes from hypotonic to hypertonic-why it goes against the gradient.

Hypertonic solutions: higher in concentration of the solute than the  solution

Hypotonic solutions: lower in concentration of a solvent

Chemical goes from hypertonic solution to the hypotonic solution

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