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Movement of Molecules

Movement of Molecules. Osmosis & Diffusion. 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

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Movement of Molecules

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  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 Solutionscontain the same concentration of solute as an another solution

  7. Concentrations http://www.tvdsb.on.ca/westmin/science/sbi3a1/Cells/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?objid=AP1903

  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?objid=AP11003

  12. Sources • http://www.tvdsb.on.ca/westmin/science/sbi3a1/Cells/Osmosis.htm • www.shodor.org/master/environmental/water/runoff/RunoffGlossary.html • wordnet.princeton.edu/perl/webwn • wblrd.sk.ca/~chem30_dev/appendix/glossary.htm • http://www.wisc-online.com/objects/index_tj.asp?objid=AP1903 • www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookglossS.html • www.geocities.com/templarser/complexglos.html

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