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Molecules PowerPoint Presentation

Molecules

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Molecules

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  1. Molecules Molecules in action Part II

  2. Hydrogen Bonds

  3. Properties • Adhesion- water molecules stick to unlike surfaces such as glass or plastic( -) Meniscus • Cohesion – water molecules stick to each other – “ sticky Mickeys” – drop of water • Water exists in three states on Planet earth ( Liquid – aquatic environment outside us and inside us)

  4. More • Specific heat – Water does not change temperature as rapdily as air- high specific heat • Density of water = 1g/ml • Surface tension – • Solutions – universal solvent- • Dissolves – salts( ionic bonds), sugar( non polar covalent), and polar covalent( unequal sharing)

  5. Water and solutions

  6. Molecules in water - polar

  7. Yea or Nay • Hydrophilic – water loving • Hydrophobic – water hating or fearing Polar molecule?

  8. Water and hydrogen ions • http://www.biology.arizona.edu/biochemistry/problem_sets/ph/ph.html

  9. Acid and Base • Acids are hydrogen donors or proton donors COOH COO- + H+ • Bases are hydrogen acceptors or proton acceptors NH2 NH3+

  10. Acids and Bases

  11. pH • pH = The concentration of H+ ions • The negative logarithm of the hydrogen ion concentration in an aqueous solution.  • pH = - log[ H30]

  12. Blood buffers

  13. pH and measurement-pHydrion paper

  14. pH measurement – pH meter

  15. Carboxylic acids

  16. Ionization of Acids • H2CO3(aq) H+(aq) + HCO3-(aq)

  17. Buffers • H2PO4-(aq) H+(aq) + HPO4-2 (aq)

  18. Buffering capacity

  19. Amino acids

  20. Amino Acid Structure • Alanine

  21. Amino acids • http://www.johnkyrk.com/aminoacid.html

  22. Formulas

  23. Structural formulas and isomers

  24. Structural formula and condensed • Complete Structural Formula • H   H   H|   |   |H - C - C - C - H|   |   |H H-C-H H|H • Condensed Structural Formula CH3CHCH3CH3 orCH(CH3)3

  25. Covalent Bonds • Carbonic acid

  26. Isomers