Ppt 4 unusual properties of water

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Ppt 4 unusual properties of water

  1. 1. Water SBI4U
  2. 2. Unusual Properties of Water
  3. 3. Video Clip of Hydrogen Bonds
  4. 4. 1. Good Solvent <ul><li>Polar covalent bond </li></ul><ul><li>Can dissolve other polar and ionic compounds. </li></ul><ul><li>How? </li></ul><ul><li>Hydration Shell : A sphere of water molecules surround each solute ion </li></ul><ul><li>Video Clip. </li></ul>
  5. 5. 2. Capillary Action <ul><li>Cohesion: water molecules “stick” together due to hydrogen bonding </li></ul><ul><li>Adhesion: clinging of water to another substance. </li></ul><ul><li>Can you think of an example from grade 11 biology? </li></ul><ul><li>Demonstration: paper towel and water </li></ul>
  6. 7. 3. High Specific Heat Capacity <ul><li>Water has the ability to hold heat without drastically increasing the temperature of the water. </li></ul><ul><li>Relevance: Helps keep the body temperature constant, prevents drastic changes in water temperature, protects aquatic life. </li></ul><ul><li>Real life example: burning hand on steel pot handle compared to the temperature of the water. </li></ul><ul><li>Demo: water balloon and air balloon </li></ul>
  7. 8. Calorie <ul><li>The amount of heat energy it takes to raise the temperature of 1g of water by 1 º C. </li></ul>
  8. 9. 4. High Heat of Vaporization <ul><li>Water needs a lot of energy to evaporate (40.7kJ/mol) </li></ul><ul><li>Due to intermolecular bonds (hydrogen bonding) water likes to stick together, therefore more energy is required to pull apart the water molecules. </li></ul><ul><li>Demo: cup of water and rubbing alcohol </li></ul><ul><li>Demo: student holds water and alcohol. </li></ul><ul><li>(can feel the coolness of the rubbing alcohol due to the body’s temperature evaporating the alcohol at a quicker rate) </li></ul>
  9. 10. 5. High Heat of Fusion <ul><li>A lot of energy is needed to melt ice. </li></ul><ul><li>Only about 15% of the H bonds are broken when ice melts. </li></ul>Vaporization
  10. 11. 6. High Surface Tension <ul><li>Water sticks together to form a strong surface. </li></ul><ul><li>That’s why you can skip rocks along the surface of the water. </li></ul><ul><li>Demo: pour water in a cup to the rim </li></ul><ul><li>Demo: Penny and eyedropper </li></ul><ul><li>Video clips: lizard and water strider </li></ul>
  11. 12. 7. Expansion on Freezing <ul><li>Water is most dense at 4 º C. </li></ul><ul><li>Liquid water will expand when heated and contract when cooled. </li></ul><ul><li>At zero degrees water becomes locked in crystalline lattice. Becomes more stable and less dense. </li></ul><ul><li>Why is this important? </li></ul><ul><li>Water can only arrange itself in certain pattern when frozen. (Illustration) </li></ul>

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