Movement of Molecules

1
Movement of Molecules

• Osmosis Diffusion

2
Terms to Know

• Mixture - a substance consisting of two or more
  substances mixed together (not in fixed
  proportions and not with chemical bonding)
• Homogeneous - describes a sample of matter that
  has uniform characteristics throughout
• Heterogeneous - describes a sample of matter that
  has parts with different compositions

3
Terms to Know

• Solution - a homogeneous mixture of two or more
  substances frequently (but not necessarily) a
  liquid solution
• Solute -a substance that is dissolved in another
  substance, thus forming a solution
• Solvent -a substance that dissolves other
  substances, thus forming a solution

4
Terms to Know

• Concentration - measure of how much of a given
  substance there is mixed with another substance
  the number of molecules of a substance in a given
  volume
• Concentration Gradient - change in the
  concentration of a substance from one area to
  another.

5
Terms to Know

• Hypotonic The solution on one side of a
  membrane where the solute concentration is less
  than on the other side. Hypotonic Solutions
  contain a low concentration of solute relative to
  another solution.
• Hypertonic The solution on one side of a
  membrane where the solute concentration is
  greater than on the other side. Hypertonic
  Solutions contain a high concentration of solute
  relative to another solution.

6
Terms to Know

• Isotonic - Isotonic Solutions contain the same
  concentration of solute as an another solution

7
Concentrations

• http//www.tvdsb.on.ca/westmin/science/sbi3a1/Cell
  s/Osmosis.htm

8
Terms to Know

• Diffusion the movement of molecules from areas
  of high concentration to areas of low
  concentration The process where molecules spread
  out to form an even concentration

9
Diffusion Example

• http//www.wisc-online.com/objects/index_tj.asp?ob
  jidAP1903

10
Terms to Know

• Osmosis the diffusion of water across a
  selectively permeable membrane the movement of a
  substance dissolved in a solution with a lower
  concentration through a membrane to a solution
  with a higher concentration
• Selectively permeable - a barrier that allows
  some chemicals to pass but not others. The cell
  membrane is such a barrier.

11
Osmosis Example

• http//www.wisc-online.com/objects/index_tj.asp?ob
  jidAP11003

12
Sources

• http//www.tvdsb.on.ca/westmin/science/sbi3a1/Cell
  s/Osmosis.htm
• www.shodor.org/master/environmental/water/runoff/R
  unoffGlossary.html
• wordnet.princeton.edu/perl/webwn
• wblrd.sk.ca/chem30_dev/appendix/glossary.htm
• http//www.wisc-online.com/objects/index_tj.asp?ob
  jidAP1903
• www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBook
  glossS.html
• www.geocities.com/templarser/complexglos.html