Intermolecular Forces

Key Points

• They are very weak.
• London Firces are found between all atoms and molecules
• Stronger London Forces mean higher boiling and melting points
• Boiling points of alkanes depends on shapes and sizes
• Long chain alkanes have higher boiling points than short-chain alkanes
• Straight chain alkanes have higher boiling points than branched alkanes
• Polar molecules have permenant dipole-dipole forces
• Hydrogen is the stongest Intermolecular force

Notes

• Electrons in charge clouds are always moving really quickly. Electrons are more likely to be more one sideed - causing a temporary dipole. This dipole causes another temporary dipole to form on the opposite side. Dipoles are attracted to one another. This continues like a domino effect…