6.4 - Hydrogen Bonding

Question 1

Define hydrogen bond.

Answer 1

Type of permanent dipole-dipole interaction where the bond is between the lone pair on the electronegative atom and the hydrogen atom

Question 2

What are the requirements for a hydrogen bond?

Answer 2

• An electronegative atom with a long pair (ATOMS O, N or F)
• Hydrogen atom attached to the electronegative atom.

Question 3

What are some anomalous properties of water?

Answer 3

• Ice is less dense than water as the hydrogen bonds hold the water molecules further apart
  
  • Creates an open lattice structure
• BP and MP is high in water as more energy is required to break the hydrogen bonds

Question 4

What are the benefits of ice being less dense than water?

Answer 4

Ice is an insulating layer, prevents water from freezing and damaging wildlife - Habitat for some animals