This comprehensive OCR A Level Chemistry PowerPoint lesson explores intermolecular forces and hydrogen bonding, including London forces, permanent dipoles and the physical properties of molecular substances.

Designed for OCR Chemistry A (H032/H432), Module 2: Foundations in Chemistry, this resource covers specification points 2.2.2(k)–(o) – Bonding and Structure. It is ideal for Year 12 students developing their understanding of how intermolecular attractions influence the properties of substances.

The lesson introduces intermolecular forces as attractions between separate molecules, distinguishing them from strong covalent bonds within molecules. Students explore induced dipole–dipole interactions (London dispersion forces), learning how instantaneous dipoles form, induce dipoles in neighbouring molecules and produce temporary attractions. The relationship between electron number, molecular size and London force strength is explained.

The PowerPoint progresses to permanent dipole–dipole interactions between polar molecules, including comparisons of intermolecular forces and their effects on melting and boiling points.

Students then investigate hydrogen bonding, learning how attractions form between molecules containing N–H, O–H or H–F bonds and lone pairs on neighbouring nitrogen, oxygen or fluorine atoms. Examples include water, ammonia, hydrogen fluoride and alcohols.

Particular attention is given to the anomalous properties of water, explaining its relatively high melting and boiling points and why ice is less dense than liquid water. The physical properties of simple molecular substances, including solubility and electrical conductivity, are also explored.

Throughout the lesson, structured activities, worked examples, application questions and knowledge checks reinforce understanding. Answers are provided to support assessment for learning.

Supplied as an editable PowerPoint presentation (.pptx), this resource is suitable for classroom teaching, independent practice and revision.

Last updated: November 2026.