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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The Basilisk Lizard
The Basilisk lizard makes use of the high surface
tension of water to accomplish the incredible
feat. It runs on water, moving its feet before
they break through the surface. 
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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.