When non polar atoms/molecules meet, there are fleeting repulsions and attractions between the nuclei and surrounding clouds of electrons- instantaneous dipoles. These induce dipoles in neighbouring molecules giving molecules a tendancy to cohere.
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What are the weakest kinds of Intermolecular forces?
London forces
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What attractions make up London forces?
Attractions between instantaneous and induced dipoles
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What increases the possibility of London forces?
Having more electrons in a molecule makes it more polarisable and so more induced dipoles can be made.
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How does a molecule's shape affect the size of London forces?
Long thin molecules can lie closer to each other so the attractions can take place over a larger surface area (than with short fat molecules)
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What is the ideal molecule shape for London forces to be made?
Long and thin
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What is the trend for group 7 boiling points and why?
Boiling points rise down the group as the greater number of electrons means more London forces can be made
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What are dipoles?
2 poles of opposite charge in a molecule
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Other cards in this set
Card 2
Front
What are the weakest kinds of Intermolecular forces?
Back
London forces
Card 3
Front
What attractions make up London forces?
Back
Card 4
Front
What increases the possibility of London forces?
Back
Card 5
Front
How does a molecule's shape affect the size of London forces?
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