Chemistry at A Level has a reputation for being one of the hardest subjects, and the syllabus shows why: with only around one in ten students reaching an A*.

At its core, A Level Chemistry covers physical, inorganic and organic chemistry, with practical skills woven through every area you study.

In this guide, we’ll explore how AQA, Edexcel, OCR and CIE structure the subject, what each major topic involves, and how you can approach the specification with confidence.

Let’s break the syllabus down clearly, one concept and exam skill at a time.

Key Takeaways

  • A Level Chemistry is usually built around three core areas: physical chemistry, inorganic chemistry and organic chemistry, with practical skills assessed throughout the qualification.
  • Each exam board organises the A Level Chemistry syllabus slightly differently, whether through content blocks, papers, modules or topic areas. We’ve broken down AQA, Edexcel, OCR and CIE individually below so you can see how each specification affects your study approach.
  • Physical chemistry includes atomic structure, bonding, energetics, entropy, Gibbs free energy, kinetics, rate equations, equilibria and acid-base calculations.
  • Inorganic chemistry focuses on periodic trends, Group 2 and Group 7 chemistry, transition metals, ligand substitution, complex ion shapes and colour changes caused by d-orbital splitting.
  • Organic chemistry covers carbon-based compounds, functional groups, curly-arrow mechanisms, aromatic chemistry, carbonyls, polymers, amino acids and spectroscopy.
  • Practical skills account for at least 15% of written exam marks across AQA, Edexcel and OCR, and students also complete a practical endorsement that assesses CPAC competencies such as safe working, apparatus use, data handling and evaluation.

The Multi-Board Landscape: How Do AQA, Edexcel, OCR, and CIE Differ?

There are several major versions of the A Level Chemistry syllabus, and while AQA, Edexcel, OCR and CIE all cover the same broad chemical foundations, each exam board organises the subject, assesses practical skills and frames exam questions in a slightly different way.

Here’s a deep dive into how these specifications differ, and why knowing the difference can change the way you study.

AQA


AQA Chemistry 7405 has three clear content blocks: physical chemistry, inorganic chemistry and organic chemistry. This structure makes the specification easier to turn into a long-term revision plan.

The content is divided into:

  • Physical chemistry, including atomic structure, amount of substance, bonding, energetics, kinetics, equilibria, thermodynamics, electrode potentials, and acids and bases
  • Inorganic chemistry, including periodicity, Group 2, Group 7, Period 3 oxides, and transition metals
  • Organic chemistry, including nomenclature, isomerism, alkanes, alkenes, haloalkanes, alcohols, carbonyls, carboxylic acids, aromatic chemistry, amines, polymers, amino acids, and spectroscopy

What makes AQA different is its strict three-part structure and the way it uses Paper 3 to test your ability to think across the whole course, rather than simply recalling one topic at a time.

Paper 3 asks you to:

  • interpret unfamiliar experimental data
  • evaluate practical procedures
  • process graphs and tables
  • handle uncertainty and measurement errors
  • connect practical skills with topics from across the full A Level Chemistry syllabus

That means your revision cannot treat practical work as a separate afterthought. With AQA, you need to know the theory, but you also need to explain how that theory behaves in real experimental conditions and how different areas of chemistry connect under exam pressure.

Edexcel

With Edexcel Chemistry 9CH0, the biggest difference is the way the specification is built around a concept-led structure rather than a simple physical, inorganic and organic split.

Instead of treating the subject as three separate blocks, Edexcel organises the content into 19 topic areas, including:

  • Atomic Structure and the Periodic Table, covering isotopes, electronic structure, ionisation energy and periodic trends
  • Bonding and Structure, including ionic, covalent and metallic bonding, molecular shapes, electronegativity and intermolecular forces
  • Redox I and II, moving from oxidation numbers and half-equations into electrode potentials and electrochemical cells
  • Inorganic Chemistry and the Periodic Table, including Group 2, Group 7 and Period 3 chemistry
  • Formulae, Equations and Amounts of Substance, covering reacting masses, titrations, percentage yield, atom economy and gas volumes
  • Energetics I and II, including enthalpy changes, Hess cycles, entropy and Gibbs free energy
  • Kinetics I and II, covering collision theory, rate equations, orders of reaction and activation energy
  • Equilibrium I and II, moving from Le Chatelier’s principle into Kc and Kp calculations
  • Acid-Base Equilibria, including pH, Ka, pKa, Kw and buffer solutions
  • Transition Metals, including complex ions, ligand substitution, colour and variable oxidation states
  • Organic Chemistry I, II and III, covering hydrocarbons, halogenoalkanes, alcohols, carbonyls, carboxylic acids, aromatic compounds, amines, amino acids and polymers
  • Modern Analytical Techniques I and II, including mass spectrometry, infrared spectroscopy and NMR

Edexcel stands out for showing how Chemistry works beyond the page. Its focus includes industrial applications, green chemistry and real-world chemical engineering decisions.

OCR

After AQA’s strict three-part structure and Edexcel’s concept-led approach, OCR Chemistry A H432 offers something slightly different: a six-module specification that builds the subject in layers, from practical foundations to advanced physical chemistry, transition metals and structural analysis.

The six modules are:

  • Module 1: Development of practical skills in chemistry, covering planning, implementation, analysis and evaluation of practical work
  • Module 2: Foundations in chemistry, including atoms, compounds, molecules, equations, amount of substance, acid-base reactions, redox, electrons, bonding and structure
  • Module 3: Periodic table and energy, including periodicity, Group 2, the halogens, qualitative analysis, enthalpy changes, reaction rates and qualitative equilibrium
  • Module 4: Core organic chemistry, including basic organic concepts, hydrocarbons, alcohols, haloalkanes, organic synthesis and analytical techniques such as IR and mass spectrometry
  • Module 5: Physical chemistry and transition elements, including quantitative rates, equilibria, pH, buffers, entropy, free energy, redox, electrode potentials and transition metals
  • Module 6: Organic chemistry and analysis, including aromatic compounds, carbonyls, carboxylic acids, esters, nitrogen compounds, polymers, organic synthesis, chromatography and NMR

What makes OCR different is its focus on mathematical precision, logical problem-solving and structural interpretation, with later modules often building directly on earlier ideas.

Practical skills are also built into Module 1, so they sit at the heart of the specification rather than feeling like an extra topic. In written exams, this can mean planning methods, choosing apparatus, processing data, evaluating uncertainty and explaining whether a result is chemically valid.

The main exam difference is Paper 3: Unified Chemistry, which pulls ideas together from across the full A Level Chemistry syllabus, so your revision needs to connect calculations, periodic trends, acids, spectroscopy and practical reasoning rather than treating each module as a separate island.

CIE

CIE, or Cambridge International AS & A Level Chemistry 9701, differs from AQA, Edexcel and OCR because it keeps a more clearly modular international structure, with AS content forming the first stage and A Level content extending it in greater depth.

At AS level, you cover foundations such as:

  • Atoms, molecules and stoichiometry, including relative masses, the mole, reacting quantities and gas volumes
  • Atomic structure, including electronic configuration, ionisation energies and orbitals
  • Chemical bonding, including ionic, covalent and metallic bonding, molecular shapes and intermolecular forces
  • States of matter, including ideal gases and the kinetic particle model
  • Chemical energetics, including enthalpy changes and Hess’s Law
  • Electrochemistry, including redox processes and electrode potentials
  • Equilibria, including Le Chatelier’s principle and equilibrium constants
  • Reaction kinetics, including rates, catalysts and activation energy
  • The periodic table, including periodicity, Group 2 and Group 17
  • Introductory organic chemistry, including alkanes, alkenes, halogenoalkanes, alcohols, carbonyl compounds and carboxylic acids

At A2 level, the syllabus becomes more demanding, moving into:

  • Lattice energy and entropy, including Born-Haber cycles and Gibbs free energy
  • Advanced equilibria, including acid-base equilibria, buffers, solubility products and partition coefficients
  • Further reaction kinetics, including rate equations and orders of reaction
  • Transition elements, including complex ions, ligand exchange, colour and variable oxidation states
  • Aromatic chemistry, including benzene, phenol and electrophilic substitution
  • Nitrogen compounds, including amines, amides and amino acids
  • Polymerisation, including addition and condensation polymers
  • Organic synthesis and analysis, including multi-step routes, infrared spectroscopy, mass spectrometry and NMR

What makes CIE stand out most is its hands-on practical assessment. Instead of assessing practical skills only through written questions, Cambridge includes a timetabled practical laboratory paper where you carry out experimental work under exam conditions.

That makes the practical side feel more immediate. You need to know how to use apparatus, record observations, handle measurements, process results and evaluate experimental reliability, not just describe a method on paper.

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What Are the Topics for A Level Chemistry? The Three Core Pillars

Despite the different ways AQA, Edexcel, OCR and CIE organise their specifications, the A Level Chemistry syllabus has the same foundation. It still centres on physical, organic and inorganic chemistry.

Here’s a deep dive into the different topic areas you’ll need to understand per core pillar.

1. Physical Chemistry

Physical chemistry is the foundation of the A Level Chemistry syllabus because it explains the rules behind chemical behaviour, from how particles are arranged to how energy, rate and equilibrium affect reactions.

These are the main physical chemistry areas you’ll need to understand and apply throughout the syllabus:

  • Atomic Structure & Sub-shells: Unpack quantum numbers, s, p, d and f orbital geometries, electron configuration exceptions such as chromium and copper, and patterns in successive ionisation energies.
  • Chemical Bonding & Intermolecular Forces: Contrast ionic, covalent, dative coordinate and metallic bonding, then deep-dive into Electron Pair Repulsion Theory, or VSEPR, shapes such as linear, tetrahedral, octahedral, seesaw and T-shaped molecules, alongside bond angles, London dispersion forces, permanent dipole-dipole interactions and hydrogen bonding.
  • Energetics & Born-Haber Cycles: Map Hess’s Law, enthalpy of formation, combustion and neutralisation, before moving into Year 13 Born-Haber cycles involving ionisation energy, electron affinity, atomisation, lattice enthalpy and hydration or solution cycles, including ΔHsol = ΔHlat + ΣΔHhyd.
  • Entropy and Gibbs Free Energy: Explain molecular disorder through entropy change, then master the thermodynamic feasibility equation ΔG = ΔH – TΔS and how to solve for the exact temperature where a reaction becomes spontaneous when ΔG = 0.
  • Kinetics, Rate Equations, and Arrhenius: Define rate equations, orders of reaction such as zero, first and second order, the rate constant k and rate-determining steps, before introducing the logarithmic Arrhenius equation for calculating activation energy, ln k = -Ea/RT + ln A.
  • Equilibria (Kc, Kp) and Acid-Base Math: Calculate equilibrium constants using the ICE table method, then move into weak acid and base calculations involving Ka, pKa, the ionic product of water Kw and the logarithmic mechanics of acidic and basic buffer solutions.

2. Inorganic Chemistry

Once you move from the behaviour of particles and energy to the periodic table itself, the subject becomes much more pattern-based, with reactions, colours and trends often explained by structure and electron arrangement.

These are the main inorganic chemistry areas you’ll need to understand and apply throughout the syllabus:

  • Periodicity & Group 2/7 Trends: Map trends in atomic radius, first ionisation energy and melting points across Period 3, then analyse Group 2 solubility trends, including how sulfates generally become less soluble down the group while hydroxides become more soluble. You also need to understand Group 7 reactivity, displacement reactions and disproportionation reactions, including chlorine in water treatment, where chlorine reacts with water to form species that kill microorganisms.
  • Transition Metal Chemistry: Define key d-block characteristics, including variable oxidation states, catalytic behaviour in homogeneous and heterogeneous systems, and ligand substitution. You also need to map complex ion shapes such as octahedral, tetrahedral and square planar, then explain how d-orbital splitting causes vivid colour changes when electrons absorb visible light and move between split energy levels, shown by ΔE = hν.

3. Organic Chemistry

Unlike inorganic chemistry, which often focuses on periodic trends and element behaviour, organic chemistry is built around carbon-based molecules, functional groups and the mechanisms that explain how one compound turns into another.

These are the main organic chemistry areas you’ll need to understand and apply throughout the syllabus:

  • Nomenclature and Reaction Mechanisms: Cover alkanes, alkenes, haloalkanes and alcohols, then systematically learn curly-arrow mechanisms such as free-radical substitution, electrophilic addition, nucleophilic substitution and elimination. You need to understand initiation, propagation and termination in radical reactions, as well as why electron-rich areas attack electron-deficient centres.
  • Aromatic Chemistry & Carbonyls: Study benzene’s stability, the limitations of Kekulé’s model and the role of electron delocalisation in aromatic compounds. You also need to understand electrophilic substitution mechanisms such as nitration and Friedel-Crafts acylation, then connect carbonyl chemistry to aldehydes, ketones, carboxylic acids, esters, acyl chlorides, amides and amines.
  • Polymerization & Amino Acids: Contrast addition polymerisation, where alkene monomers join without losing small molecules, with condensation polymerisation, where polyesters and polyamides form with the elimination of molecules such as water or hydrogen chloride. You also need to understand amino acids as zwitterions, how peptide bonds form, and how primary, secondary and tertiary protein structures depend on bonding and molecular shape.
  • Analytical Architecture & Spectroscopy: Build your structural deduction toolkit using infrared spectroscopy, mass spectrometry and nuclear magnetic resonance. IR spectroscopy helps you identify functional groups through characteristic wavenumber ranges, mass spectrometry reveals molecular ions and fragmentation patterns, and ¹H and ¹³C NMR require you to interpret chemical shifts, splitting patterns using the n + 1 rule, and integration traces.

By this point, the full topic picture is clearer: A Level Chemistry is built around physical, inorganic and organic chemistry, with organic work moving from simpler Year 1 carbon chains into more advanced Year 2 topics such as aromatic compounds, carbonyls, polymers, amino acids and spectroscopy, where electron delocalisation becomes essential.

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The Laboratory Endorsement: Core Practicals and CPAC Competencies

Practical chemistry is not separate from the A Level Chemistry syllabus. Every major exam board expects you to understand apparatus, measurement, data handling, uncertainty and experimental evaluation, but the practical format differs depending on whether you study AQA, Edexcel, OCR or CIE.

Here’s how practical work is usually organised across the main exam boards:

  • AQA: AQA requires students to complete at least 12 required practical activities. Examples include acid-base titration, measuring an enthalpy change, measuring the EMF of an electrochemical cell and using thin-layer chromatography.
  • Edexcel: Edexcel includes 16 core practical activities in its A Level Chemistry specification. Examples include preparing organic liquids or solids, testing for organic functional groups, investigating reaction rates and analysing compounds through spectroscopy-linked techniques.
  • OCR: OCR Chemistry A uses 12 Practical Activity Groups, known as PAGs. Examples include moles determination, qualitative analysis of ions, synthesis of an organic liquid or solid and pH measurement.
  • CIE: CIE does not use a fixed list of UK-style required practicals. Instead, Cambridge International AS & A Level Chemistry assesses practical skills through Paper 3: Advanced Practical Skills and Paper 5: Planning, Analysis and Evaluation, with tasks focused on quantitative analysis, qualitative analysis, measurement, data processing and experimental evaluation.

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Strategic Study: Translating the Specification into an A*

Getting an A* in Chemistry means turning the specification into a working system, not a reading list. You need to know definitions, equations, mechanisms, practical methods and examiner wording well enough to use them under timed pressure.

Start by separating revision into three layers. First, build recall: reagents, conditions, colour changes, equations and required practical details. Next, practise application: mole calculations, pH questions, rate equations, organic mechanisms, spectroscopy and unfamiliar data. Finally, train synoptic thinking, where one question can combine buffers, equilibria, entropy, redox or organic synthesis.

Mark schemes are often precise, so language matters. Phrases such as “increased nuclear charge”, “similar shielding”, “rate-determining step”, “heterolytic fission” and “electrons are promoted between split d-orbitals” can make the difference between a vague answer and a credited one.

Each week, include specification checks, timed questions, calculation practice, one mechanism map and one practical skills task. If you want a more detailed revision framework, our guide on how to revise Chemistry A Level goes deeper on active recall, past-paper strategy and how to turn weak answers into examiner-ready responses.

FAQs

What Are the Main Topics in A Level Chemistry?

A Level Chemistry is mainly divided into physical chemistry, inorganic chemistry and organic chemistry. Physical chemistry covers atomic structure, bonding, energetics, kinetics, equilibria, acids and bases. 

Inorganic chemistry focuses on periodic trends, Group 2, Group 7 and transition metals. Organic chemistry covers carbon-based compounds, mechanisms, aromatic chemistry, polymers, amino acids and spectroscopy. Practical skills are also assessed throughout the course.

Is A Level Chemistry Harder Than GCSE Chemistry?

A Level Chemistry is harder than GCSE Chemistry because it requires deeper explanation, stronger maths and more precise exam technique. At GCSE, you often describe what happens in a reaction. 

At A Level, you explain why it happens using bonding, energetics, equilibrium, kinetics, electron structure and reaction mechanisms. You also need to interpret unfamiliar data, handle practical uncertainty and write answers in the specific language examiners expect.

What Is the Difference Between AS Chemistry and Full A Level Chemistry?

AS Chemistry is usually the first stage of the qualification, while the full A Level includes both AS and more advanced A2 content. AS topics often cover foundations such as atomic structure, bonding, energetics, equilibria, kinetics and introductory organic chemistry. 

A2 then extends the course into more complex areas such as thermodynamics, advanced equilibria, transition metals, aromatic chemistry, polymers, spectroscopy and multi-step organic synthesis.

How Much Maths Is Involved in A Level Chemistry?

A Level Chemistry includes regular maths, but it is usually more applied than abstract. You need confidence with rearranging equations, using logarithms, working with standard form, calculating moles, analysing rates, using equilibrium constants, interpreting graphs and handling pH calculations. 

Physical chemistry is the most calculation-heavy area of the A Level Chemistry syllabus. This is especially true for energetics, kinetics, equilibria, acids and bases, entropy and electrochemical cells.

Which Exam Board Is Hardest for A Level Chemistry: AQA, Edexcel, OCR or CIE?

No exam board is universally the hardest for A Level Chemistry because each one tests difficulty in a different way. AQA is demanding because of its strict physical, inorganic and organic structure plus Paper 3 synoptic practical questions. 

Edexcel can feel challenging because of its concept-led organisation and applied chemistry focus. OCR often rewards mathematical precision and linked reasoning. CIE stands out because of its modular AS and A2 structure and practical laboratory assessment.

What Grade Is 70% in A Level Chemistry?

A 70% mark in A Level Chemistry does not always equal the same grade each year. Grade boundaries change depending on the exam board, paper difficulty and national performance. 

In some years, 70% may sit around an A or high B, while in other years it may be different. The safest way to check is to look at the official grade boundaries for your exact exam board, qualification code and exam series.

Conclusion: Mastering the A Level Chemistry Syllabus

Mastering Chemistry is not about memorising every equation in isolation. It is about seeing how patterns, mechanisms, calculations and practical evidence fit together.

The A Level Chemistry syllabus can feel demanding, but it becomes clearer when you treat physical, inorganic and organic topics as one connected system.

Build from foundations, practise exam wording, and keep returning to data, apparatus and mechanisms until each answer feels precise, justified and complete.

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