Intermolecular Forces
Use this landing page to move between the six intermolecular forces revision pages for OCR A Level Chemistry Module 2. Each card links to a focused page covering part of 2.2.2(k) to (o), with links out to the boiling point trends examined in 3.1.3, 4.1.2 and 4.2.1.
Choose an Intermolecular Forces Page
Intermolecular forces are the attractions between molecules, and OCR examines them in 2.2.2 and then reuses them for the halogens in 3.1.3, the alkanes in 4.1.2 and the alcohols in 4.2.1. These pages separate induced dipole-dipole interactions, permanent dipole-dipole interactions and hydrogen bonding, then apply them to water, to boiling points and to solubility.
Key idea: Intermolecular forces act between molecules and are far weaker than the covalent bonds inside them; when a molecular substance melts or boils, only these forces are overcome.
London Forces
Revise how moving electrons create instantaneous and induced dipoles, and why electrons and shape decide their strength.
Start revisingPermanent Dipole-Dipole Forces
Revise which molecules have a permanent dipole, how they attract, and how to decide the forces in an unfamiliar molecule.
Start revisingHydrogen Bonding
Revise the N-H, O-H and H-F requirement, the exam diagram, and predicting hydrogen bonding in other molecules.
Start revisingAnomalous Properties of Water
Revise why water has such a high boiling point, why ice floats and why water has a high surface tension.
Start revisingBoiling Point Trends
Revise boiling point trends for alkanes, branched isomers, alcohols and the hydrogen halides.
Start revisingChoosing Solvents
Revise hydration of ions, alcohols in water, why some polar molecules do not dissolve, and non-aqueous solvents.
Start revisingCopyright notice: This revision page, including its written explanations, layout and teaching sequence, is produced for Online Learning System by Dr. Mohammed Al-Fatah. It is intended for student revision and may not be copied, redistributed or republished without permission.
Keep this note — free
Save your progress across every OCR A topic. A free account remembers which topics you have covered, saves your question scores, and syncs across your phone and laptop.
- Track every topic you have finished
- Keep your practice-question scores
- No payment, no card, free forever
Already registered? Log in