Why does the latent heat of vaporization require so much heat ...

[Ebrown]

Why does the latent heat of vaporization require so much heat energy?
  a. The energy is needed to break the strong covalent bonds.
  b. The energy is required to stabilize bond vibrations.
  c. The energy is used to break the hydrogen bonds.
  d. All of these choices.

Question 2

What allows water to be a polar molecule?
  a. Hydrogen bonds
  b. Adhesion
  c. Surface tension
  d. The angular shape of the molecule

[wergv]

Answer to Question 1

ANS: D
The heat energy needed for the latent heat of vaporization is high because it is used to break hydrogen
bonds. These bonds are connecting the individual water molecules to each other. Information can be
found in the section Water Has Unusual Thermal Characteristics.

Answer to Question 2

ANS: D
The positioning of oxygen's electrons causes the water molecule to form an angular shape once the
covalent bonds are created. This creates a slight positive charge at one end of the molecule and a slight
negative charge at the other end. This allows attraction to other partially charged atoms to occur.
Information can be found in the section The Water Molecule Is Held Together by Chemical Bonds.

[Ebrown]

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