Master every bond, angle, and mark scheme from S2.1 to S2.2

If you've ever stared at a Lewis structure question and felt confident — only to drop marks because you forgot to assign formal charges or chose the wrong resonance form — you already know the problem with how bonding is usually taught. The concepts aren't that hard. The gap is between understanding them loosely and being able to apply them precisely, in the exact language the mark scheme requires.

That gap is what this school is built to close.

Structure and bonding sits at the heart of IB Chemistry. It connects to thermochemistry, to organic chemistry, to spectroscopy — it is, in many ways, the conceptual backbone of the entire course. And yet it's often taught in a rush, with Lewis structures treated as a drawing exercise and VSEPR reduced to a table to memorise. My aim here is different: every concept is unpacked step by step, anchored to a real molecular example, and explained in the precise vocabulary an IB examiner expects to see. When you learn how to explain why SF₆ has an expanded octet, or why the bond angle in SO₂ is less than 120°, you learn it in a way that transfers directly to a Paper 2 response.

For HL students, I've given particular care to the topics that carry the most demand and cause the most confusion: resonance and electron delocalization, benzene and aromaticity, expanded octets, formal charge, and hybridization. These aren't difficult ideas — but they require a framework, and that's exactly what these units provide. By the time you've worked through the orbital model section, the relationship between hybridization, geometry, and bonding will feel logical, not like a list of rules to memorise.

The SL core is equally complete. Whether you're covering ionic lattices for the first time or revisiting intermolecular forces before your mocks, the explanations here are clean, sequenced, and free of unnecessary complexity. I have not assumed prior knowledge beyond what IB Year 1 students arrive with, but I have also not talked down to you — you are preparing for a rigorous university-entrance qualification, and the instruction here reflects that.

If you're a teacher, I hope this gives your students a resource they can actually sit with independently — one that speaks in the same precise register you're trying to model in the classroom, and that handles the hard questions (why is this Lewis structure preferred? what does 'delocalized' actually mean electronically?) with enough care that students arrive to your lessons with real understanding rather than surface familiarity.

The goal, in every lesson, is the same: clear thinking, exact language, and the confidence to put it on the page when it counts.