Intermolecular forces

Intermolecular forces are responsible for holding together the two strands of a DNA molecule

Before tackling this topic make sure you are able to:

explain the difference between intermolecular and intramolecular forces.
use electronegativity values to work out dipoles within molecules
use ideas about molecular shapes and dipoles to predict whether or not a molecule is polar.

Hydrogen bonds in DNA

Professor Dave explains

What do these two graphs show?

How do we explain the trends?

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Hydrogen bonding is responsible for the extraordinary and unique properties of water.

Ice is less dense than liquid water and therefore floats.

Alpha helices are held in shape by hydrogen bonds

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