Why does liquid water expand slightly when cooled from 4C to 2C? ...

[viki]

Why does liquid water expand slightly when cooled from 4C to 2C?
 
  A) The molecules vibrate faster and the molecules move farther apart.
  B) The molecules vibrate faster and the molecules move closer together.
  C) The molecules vibrate slower and the molecules move farther apart as hydrogen bonds form.
  D) The molecules vibrate slower and the molecules move closer together as hydrogen bonds form.
  E) none of the above

Question 2

The hydroxide ion, HO-, is a ________.
 
  A) unique form of water
  B) very strong acid
  C) polyatomic ion
  D) proton donator

[tandmlomax84]

Answer to Question 1

C

Answer to Question 2

C

[viki]

Excellent

[Joy Chen]

Wow, this really help