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THE AMAZING WATER MOLECULE

THE AMAZING WATER MOLECULE. THERE IS NOTHING LIKE IT ON EARTH. H 2 0. The water molecule is made of 2 atoms of hydrogen and one atom of oxygen. This atoms are held together by two covalent bonds. Each atom now has its valence, or outer orbital filled. Water Molecules are Polar.

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THE AMAZING WATER MOLECULE

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  1. THE AMAZING WATER MOLECULE THERE IS NOTHING LIKE IT ON EARTH

  2. H20 • The water molecule is made of 2 atoms of hydrogen and one atom of oxygen. This atoms are held together by two covalent bonds. • Each atom now has its valence, or outer orbital filled.

  3. Water Molecules are Polar

  4. Water Molecules Like to Stick Together

  5. The water molecule is a polar molecule. • It has a partial positive and a partial negative side. • At any one time more electrons will be closer to the oxygen nucleus than to the hydrogen nucleus. • Oxygen has a greater pull than does hydrogen because it has 8 protons.

  6. Hydrogen Bonding • Is a weak attraction between water molecules. • Cohesion – water wants to stick to itself. • Adhesion – water wants to stick to surfaces that are hydrophilic. • Surface Tension – water forms a layer at its surface between air and water.

  7. Hydrogen Bonding is not a real bond but a weak attraction.

  8. Ice Floats • Water boils at 100 C and water molecules are very far apart. • Water freezes at 0 C and water molecules are closer together. • Water is its most dense at 4C and so more molecules can be present in a given volume than at any other temp. • As molecular motion slows, the molecules become locked in a crystal structure known as ice. • This distance is greater than than at 4 C.

  9. Water can be in 3 states at the Same Time in the Same Place!

  10. Universal Solvent

  11. Other Unique Properties of Water • High Specific Heat Takes a lot of energy to raise the temp.of water. The wetter the climate, the more moderate the climate. • High Heat of Vaporization Water has a cooling effect.

  12. Thursday, May 8 • Draw the water molecule and label the atoms, protons, & electrons. • What type of bond exists between the atoms in the water molecule? • What type of bond exists between 2 water molecules?

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