Hydrogen bonding

When explaining if a molecule is polar or not, what to mention? (3)

-          Number of bonded and lone pairs

-          (if they repel equally as far apart as possible)

-          If the dipoles cancel or not

-          Symmetry of the molecule

What are the anomalous properties of water? (2)

-           Ice is less dense than water

-          High melting and boiling point

Why is ice floating on water an anomalous property?

-          Hydrogen bonds hold the water molecules far apart

-          In an open lattice structure

Why is water’s high melting and boiling point an anomalous property?

-          Strong hydrogen bonds

-          Require much more energy to overcome

Diagram of hydrogen bonding in water things to remember: (3)

-          Dipoles

-          Lone pair on oxygen

-          Straight line

define hydrogen bonding

Attraction between a lone pair of electrons on an electronegative atom in one molecule and a hydrogen atom in another molecule attached to an electronegative atom