Water

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Water
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• Water is a compound composed of two atoms of
  the element hydrogen and one atom of oxygen.

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Water exists in three states
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Water Vapor

• Gas molecules have so much motion that they
  move freely throughout the container and are
  unaffected by the attractions to the other
  molecules.

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Sticky Molecules

• Water molecules in the liquid and solid states
  have a tendency to stick together.

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Why are water molecules "sticky"?

• The oxygen atom attracts the electrons within
  the covalent bonds leaving the hydrogen atoms
  with a slightly positive charge.

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Between the Molecules

• A hydrogen bond is formed when the slightly
  positive hydrogen atom of one water molecule is
  attracted to a lone pair of electrons of another
  water molecule.

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Ice

• In the solid state, the H2O molecules have a
  relatively open structure with six molecules
  forming a ring.

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• In solid ice, hydrogen atoms on two different
  water molecules interact with the electron pairs
  of a oxygen atom on another water molecule.

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Liquid Water

• In liquid water, the structure is less orderly
  because the interactions between molecules are
  more random.

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Have you ever noticed.....

• that water forms drops?
• The cohesive property of water is due to the
• structure of the water molecule.

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Have you ever noticed.....

• that certain insects can walk on water?
• The unique structure of water is responsible
• for the surface tension of water.

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Have you ever noticed.....

• ice cubes floating in a glass of water?
• This common sight represents very
• unusual behavior.

Water is colored blue for better visibility.
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Have you ever noticed.....

• the beautiful symmetry of snowflakes?

Nothing would be the same on this planet without
the unique structure of water.
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Use the Molecular Structure of Water Kit
to investigate the unique structure of water.