Osmosis and Diffusion

• Osmosis


  Diffusion of water through a selectively permeable membrane
• Diffusion


  Movement of molecules from an area of higher concentration to an area of lower concentration.
• active transport


  the movement of materials through a cell membrane using energy
• passive transport


  the movement of substances across a cell membrane without the use of energy by the cell
• Solute


  the substance that is dissolved
• Solvent


  A substance capable of dissolving other substances
• Solution


  A mixture that forms when one substance dissolves another.
• Equilibrium


  when the concentration of a solute is the same throughout a solution
• concentration gradient


  A difference in the concentration of a substance across a distance.
• permeable


  Able to be passed or soaked through
• cell membrane


  A cell structure that controls which substances can enter or leave the cell.
• semi permeable


  some substances can pass across them and others cannot
• Kinetic energy


  energy of motion
• independent variable


  variable that I change
• dependent variable


  the variable that is measured in an experiment
• control


  In an experiment, the standard that is used for comparison