Chapter Explainers
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Chapter Explainers articles for SPM Chemistry.
Acids, Bases and Salts: The Ideas That Trip Students Up
The role of water, strong versus concentrated, and choosing a salt-prep method, the acids, bases and salts ideas that catch SPM students out, cleared up.
2026-09-04Chapter ExplainersAtomic Structure: Subatomic Particles to Isotopes
Protons, neutrons and electrons, proton and nucleon number, electron arrangement, and isotopes with a worked relative atomic mass, the atomic structure core for SPM.
2026-09-04Chapter ExplainersCarbon Compounds: Getting Organic Chemistry to Click
The big picture of SPM organic chemistry: homologous series, functional groups, naming and the key reactions of alkanes, alkenes, alcohols and acids.
2026-09-04Chapter ExplainersCommon Mistakes in Acids, Bases and Salts
The acids, bases and salts errors that cost SPM marks, wrong products, basicity slips, salt-preparation and titration mistakes, and how to fix each.
2026-09-04Chapter ExplainersCommon Mistakes in Electrochemistry
The electrochemistry errors that lose SPM marks, anode and cathode polarity, wrong cathode products, half-equation slips, and how to avoid each one.
2026-09-04Chapter ExplainersCommon Mistakes in Organic Chemistry for SPM
The organic chemistry errors that lose SPM marks, wrong formulae, naming slips, addition versus substitution, colour-change mix-ups, and how to fix them.
2026-09-04Chapter ExplainersCommon Mistakes in Rate of Reaction Questions
The rate of reaction errors that quietly lose SPM marks, vague collision-theory answers, average vs instantaneous rate, graph misreadings, and the fix for each.
2026-09-04Chapter ExplainersCommon Mistakes in the Mole Concept (and Fixes)
The mole-concept errors that quietly cost SPM Chemistry marks, wrong molar mass, unit slips, mixed-up molar volumes, and exactly how to avoid each.
2026-09-04Chapter ExplainersCommon Mistakes in Thermochemistry Calculations
The thermochemistry slips that cost SPM marks, wrong mass, dropped signs, forgetting to divide by moles, with a worked heat of neutralisation to copy.
2026-09-04Chapter ExplainersElectrochemistry: Electrolysis and Cells Made Clear
Electrolysis and chemical cells untangled for SPM: what the electrodes do, why aqueous solutions need selective discharge, and how a voltaic cell works.
2026-09-04Chapter ExplainersEvery Chemical Test in SPM Chemistry, in One Place
One place for every SPM test, gases, water, unsaturation and organic groups, each with the reagent, what you do, and the observation that scores the mark.
2026-09-04Chapter ExplainersMaking Sense of Chemical Bonding for SPM
Ionic or covalent, transfer or share? A clear SPM guide to bonding: why atoms bond, how to tell the types apart, and how bonding sets properties.
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