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Lecture21 dec2-bb


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Lecture21 dec2-bb

  1. 1. 1
  2. 2. If the two charges have the same sign, the electrostatic force between them is repulsive Water consists of an oxygen atom bound to two hydrogen atoms by two single covalent bonds.
  3. 3. 8
  4. 4. 9
  5. 5. Covalent bond Within a water molecule the bonds between oxygen and hydrogen are highly polar. - oxygen is partially negative - hydrogen is partially positive Hydrogen bond Hydrogen bonds can form between water molecules or between water and another charged molecule. 10
  6. 6. Hydrogen bond between water molecules Hydrogen bond between water and another charged molecule. 11
  7. 7. cohesion: water molecules stick to other water molecules by hydrogen bonding Why they move together?
  8. 8. adhesion: water molecules stick to other polar molecules by hydrogen bonding
  9. 9. Figure 3.3 Adhesion Two types of water-conducting cells Cohesion Direction of water movement 300 m
  10. 10. The formation of ice in freshwater: