A-Level Chemistry essential study guide
What actually needs mastering across physical, inorganic and organic chemistry, the calculations and mechanisms that repeat every year, and a weekly routine that fits around the rest of your subjects. Applies to AQA, Edexcel and OCR specifications.
Physical chemistry
The calculation-heavy backbone of the course. Almost every paper rewards clean working and correct units.
- Amount of substance: moles, concentration, ideal gas equation, percentage yield and atom economy.
- Energetics: enthalpy changes, Hess cycles, bond enthalpies, and calorimetry including sources of error.
- Kinetics: rate equations, orders from initial-rate and graphical data, rate-determining step, Arrhenius.
- Equilibria: Kc and Kp expressions, Le Chatelier reasoning, and how a catalyst affects rate but not position.
- Acids and bases: strong and weak pH, Ka and pKa, buffers and titration curve shapes for each acid-base pair.
- Redox and electrode potentials: half equations, cell EMF, feasibility, and electrochemical cells.
- Thermodynamics: lattice enthalpy, Born-Haber cycles, entropy change and Gibbs free energy feasibility.
Inorganic chemistry
Pattern recognition. Learn the trends first, then attach the specific observations and equations to them.
- Periodicity: atomic radius, ionisation energy, melting point trends and the reasons behind each.
- Group 2: reactions with water, solubility trends of hydroxides and sulfates, and their uses.
- Group 7: trends in boiling point, oxidising ability of halogens, reducing ability of halides, disproportionation.
- Period 3 oxides: bonding, structure, reaction with water and the resulting pH.
- Transition metals: variable oxidation states, complex ions, ligand substitution, colour changes and catalysis.
- Qualitative analysis: the observations for each test, written as an examiner would want them.
Organic chemistry
Mechanisms plus synthesis routes. If you can draw the arrows, most of the mark scheme follows.
- Nomenclature, isomerism (structural, E/Z, optical) and how to identify chirality quickly.
- Mechanisms to reproduce from memory: free-radical substitution, electrophilic addition, electrophilic substitution, nucleophilic substitution, nucleophilic addition, nucleophilic addition-elimination, elimination.
- Functional group conversions: alkene to alcohol to halogenoalkane to nitrile to amine, with reagents and conditions.
- Carbonyls, carboxylic acids and derivatives: reactions, distinguishing tests, and esterification.
- Aromatic chemistry: nitration, halogenation, Friedel-Crafts, and why benzene resists addition.
- Polymers, amino acids and proteins, plus condensation and addition polymer identification.
- Analysis: mass spectra fragmentation, infrared absorptions, and both proton and carbon-13 NMR interpretation.
A weekly routine that works
Where marks are lost
- Rounding part-way through a multi-step calculation instead of at the end.
- Omitting state symbols in equations where the mark scheme requires them.
- Drawing curly arrows from the wrong place: they start at a lone pair or a bond, never at an atom symbol.
- Explaining a trend with "it gets bigger" instead of naming shielding, nuclear charge and atomic radius.
- Describing a colour change without stating both the starting and final colour.
Practise it, don't just read it
Paste a module of your Chemistry notes into Recall Study and get flashcards, a quiz or exam-style questions straight away. Free for three generations a day.
Keep going
- Chemical bonding revision — ionic, covalent and metallic structures and their properties.
- Atomic structure revision — sub-shells, ionisation energies and mass spectrometry.
- UK exam dates and reminders — plan backwards from your Chemistry papers.
- Active recall, done properly — the technique this routine is built on.
FAQs
How should I revise A-Level Chemistry?
Split every session into three parts: recall the definitions and equations, work through calculations without looking at worked examples, and draw mechanisms from memory. Chemistry marks are lost on precision, not on effort.
Which A-Level Chemistry topics are hardest?
Most students find thermodynamics and entropy, electrode potentials, kinetics and rate equations, and organic synthesis routes the hardest. All four are pattern-based, so repeated timed practice beats re-reading.
How much of A-Level Chemistry is maths?
Around 20 percent of the marks are mathematical: moles, titrations, yields, Kc and Kp, pH, rate constants and enthalpy calculations. Practise them under time pressure with correct units and significant figures.
Do I need to memorise organic mechanisms?
Yes. Curly arrows, intermediates and conditions must be reproducible from memory. Learn each mechanism as a story: what attacks what, why, and what leaves.