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S2.2 Benzene, HL (IBDP Chemistry)

S2.2 Benzene, HL (IBDP Chemistry)

Subject: Chemistry

Age range: 16+

Resource type: Lesson (complete)

Last updated

26 February 2026

pptx, 2.57 MB
pptx, 2.57 MB

This PowerPoint lesson develops a clear, evidence-based understanding of the structure of benzene, guiding Higher Level IBDP Chemistry students beyond simple bonding models. Designed for first assessment 2025, it prepares students to explain benzene’s unusual stability and reactivity using experimental data and resonance theory.

Benzene is an aromatic hydrocarbon with the formula C₆H₆ that cannot be accurately described by alternating single and double bonds. Instead, it exists as a resonance hybrid with six delocalised π electrons spread evenly around the ring. This lesson defines key ideas such as delocalisation, resonance (stabilisation) energy, addition reactions, and substitution reactions, and shows how these concepts explain benzene’s behaviour.

Students explore historical models of benzene, including Kekulé’s structure, and evaluate why these fail when compared with experimental evidence. Physical evidence such as bond length measurements and bond angles, alongside chemical evidence from hydrogenation enthalpy data and bromine reactions, is used to justify the modern resonance model. The lesson clearly distinguishes between physical and chemical evidence, a key Higher Level exam requirement.

The PowerPoint also explains how benzene is represented in different diagrams, including Lewis structures, skeletal Kekulé forms, and the resonance circle notation, with clear exam guidance on when each representation is appropriate. Electron counting and the distribution of π electrons above and below the ring are explicitly addressed.

The lesson includes starter activities, structured explanations, worked examples, practice questions, and answers aligned with IB command terms and markscheme expectations. It is ideal for classroom teaching, consolidation, or HL revision.

File type included: PowerPoint (.pptx)
Last updated: January 2026 – explanations refined, evidence clarified, and HL scope checked against the 2025 IB Chemistry syllabus.

Get this resource as part of a bundle and save up to 33%

A bundle is a package of resources grouped together to teach a particular topic, or a series of lessons, in one place.

Bundle

BUNDLE S2.2 The Covalent Model HL Only Content (IBDP Chemistry)

This comprehensive bundle of PowerPoints covers the Higher Level content of Topic 2.2 The Covalent Model for IBDP Chemistry (first examination 2025). It develops deep conceptual understanding of resonance, benzene, expanded octets, formal charge, sigma and pi bonding, and hybridisation in a structured, exam-focused sequence. The covalent model explains how atoms share electrons to form molecules, and at HL it extends beyond simple Lewis structures to include delocalisation, orbital overlap and electron-domain analysis. This bundle is designed to build that progression logically — from resonance structures through to hybridisation and aromatic stability — ensuring students can connect Lewis formulas, VSEPR theory, bond order, formal charge and orbital theory. Included lessons: • Resonance Structures – electron delocalisation, bond order, ozone, carbonate, nitrate and resonance hybrids • Benzene – historical models, bond length evidence, hydrogenation data, resonance energy and aromatic stability • Expanded Octets & VSEPR – five and six electron domains, trigonal bipyramidal, T-shaped, octahedral, square planar • Formal Charge – selecting preferred Lewis structures and evaluating charge distribution • Sigma and Pi Bonds – orbital overlap, bond strength, restricted rotation, delocalised π systems • Hybridisation – sp, sp², sp³ bonding, excitation, molecular geometry and benzene delocalisation Throughout the bundle, students analyse physical and chemical evidence, compare alternative structures, and apply exam-style reasoning. Clear worked examples, mini-whiteboard tasks, structured explanations and practice questions are included in each lesson. This resource is ideal for teaching, consolidation or HL revision and aligns fully with the 2025 IB Chemistry syllabus. File type included: Multiple PowerPoint files (.pptx) Last updated: January 2026 – sequencing refined and cross-links between resonance, hybridisation and benzene strengthened for conceptual clarity.

£8.00

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faye_hadlington123

4 months ago
5

These lessons are such a time saver. All you need in a lesson is included. Love the structure and the activities that are included.

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