Study guides

Groups in the periodic table

Pearson Edexcel·GCSE

Pearson-GCSE-Chemistry

Master the properties, trends, and reactions of Group 7 Halogens. This guide covers everything from physical states to complex displacement and redox reactions to secure top marks in your GCSE Chemistry exam.

Halogenoalkanes

AQA·A-Level

7405

Master the reactions and mechanisms of Halogenoalkanes! This guide covers everything from nucleophilic substitution and elimination to the environmental impact of CFCs on the ozone layer.

Introduction to organic chemistry

AQA·A-Level

7405

A mark-focused foundation guide to hydrocarbons, formulae, isomerism, crude oil, cracking, combustion and alkene chemistry, with clearly labelled A-level bridge content for IUPAC detail, E/Z and mechanisms.

Key concepts in chemistry

Pearson Edexcel·GCSE

Pearson-GCSE-Chemistry

Master the fundamentals of covalent bonding, from drawing precise dot and cross diagrams to explaining the physical properties of simple molecules. This core topic forms the foundation for understanding how non-metals interact, a guaranteed source of marks in your chemistry exams.

Optical isomerism (A-level only)

AQA·A-Level

7405

Optical isomerism turns a flat organic formula into a 3D exam problem: spot the chiral centre, draw the two enantiomers and explain their effect on plane-polarised light. Secure these ideas and you can reliably earn the marks in short definitions, stereochemical drawings and synoptic carbonyl-mechanism questions.

Organic chemistry

AQA·GCSE

8462

Master the fundamentals of carbon-based compounds, from the fossil fuels that power our world to the polymers in everyday plastics. This high-yield topic is a favourite of examiners, testing your ability to spot patterns in homologous series and balance crucial reaction equations.

Particles and atomic structure

Eduqas·GCSE

WJEC-GCSE-Chemistry

Master the fundamental building blocks of Chemistry. This topic covers the particulate model, atomic structure, and isotopes — essential knowledge that underpins the entire specification and guarantees you exam marks.

Periodicity

AQA·A-Level

7405

AQA A-level Chemistry 3.2.1 Periodicity: a marks-focused guide to Period 3 trends, electron sub-shell blocks, ionisation-energy anomalies, and structure-dependent melting points.

Production, use and disposal of important chemicals and materials

Eduqas·GCSE

WJEC-GCSE-Chemistry

Master the essential industrial processes that shape our modern world, from the Haber process and fertiliser production to materials science and corrosion. This topic connects chemical principles with real-world applications, teaching you how to evaluate the environmental impact and sustainability of the materials we rely on daily.

Properties of Period 3 elements and their oxides (A-level only)

AQA·A-Level

7405

Master the properties of Period 3 elements and their oxides. This topic connects atomic structure to macroscopic properties and acid-base behaviour, featuring classic 6-mark questions on melting point trends and amphoteric reactions.

Pure substances and mixtures

Eduqas·GCSE

WJEC-GCSE-Chemistry

Master the scientific definition of purity and the physical techniques used to separate mixtures. This topic is essential for understanding how chemists analyse, identify, and purify substances in the laboratory and industry.

Quantitative chemistry

AQA·GCSE

8462

Quantitative Chemistry is the mathematical engine room of the subject, where we use the mole concept to determine exactly how much product a reaction will make. Mastering these calculations is essential, as they account for a significant proportion of the marks across all your chemistry exam papers.

Rate equations (A-level only)

AQA·A-Level

7405

Master the mathematics of reaction kinetics with this comprehensive guide to A-level rate equations. You'll learn to deduce reaction orders from experimental data, calculate the rate constant, and use the Arrhenius equation to link temperature to activation energy.

Rate of chemical change and dynamic equilibrium

Eduqas·GCSE

WJEC-GCSE-Chemistry

Master the speed of chemical reactions and the delicate balance of dynamic equilibrium. This topic is essential for understanding how industrial processes are optimised to save time and money, and it's a guaranteed high-mark area in your GCSE Chemistry exams.

Rates of reaction and energy changes

Pearson Edexcel·GCSE

Pearson-GCSE-Chemistry

Master the speed of chemical reactions and the energy they release or absorb. This high-yield topic connects collision theory to real-world applications and guarantees marks for graphing and calculations.

Reactions of ions in aqueous solution (A-level only)

AQA·A-Level

7405

This A-level-only topic turns vivid test-tube observations into high-mark chemistry. Master the aqua-ion acidity explanation, the diagnostic precipitate colours, and the carbonate rule, and you can confidently identify Fe²⁺, Cu²⁺, Fe³⁺, and Al³⁺ while explaining every observation.

Reactivity series and extraction of metals

Eduqas·GCSE

WJEC-GCSE-Chemistry

Master the reactivity series and the extraction of metals! This topic connects the theoretical ranking of metals to the real-world industrial processes used to extract them, forming a core part of your chemistry exams.

Redox Reactions

OCR·GCSE

Master the core principles of redox reactions for your OCR GCSE Chemistry exam. This guide breaks down electron and oxygen transfer, half-equations, and displacement reactions, equipping you with the knowledge to secure top marks.

Separate chemistry 1

Pearson Edexcel·GCSE

Pearson-GCSE-Chemistry

Master the principles of chemical cells and hydrogen-oxygen fuel cells. This topic is essential for understanding modern clean energy technology and frequently appears in 4-6 mark evaluation questions.

Separate chemistry 2

Pearson Edexcel·GCSE

Pearson-GCSE-Chemistry

Master the fundamentals of hydrocarbons with this essential guide to alkanes and alkenes. You'll learn to draw structural formulas, distinguish saturated from unsaturated molecules, and ace the classic bromine water test—key skills that frequently appear in 4-6 mark exam questions.

States of Matter and Changes of State

OCR·GCSE

Master the fundamental principles of States of Matter for your OCR GCSE Chemistry exam. This guide breaks down the particle model, changes of state, and energy transfers, providing you with the essential knowledge to secure top marks.

States of matter and mixtures

Pearson Edexcel·GCSE

Pearson-GCSE-Chemistry

Master the fundamentals of how particles behave in solids, liquids, and gases, and learn how to separate complex mixtures into pure substances. This topic is heavily tested in exams, particularly your ability to choose and justify separation techniques and calculate Rf values.

The Earth and its atmosphere

Eduqas·GCSE

WJEC-GCSE-Chemistry

Master the evolution of the Earth's atmosphere, the greenhouse effect, and the impact of human activity on our climate. This topic is heavily tested on long-answer questions where precise scientific terminology and logical explanations earn top marks.

The Periodic Table

OCR·GCSE

This guide provides a comprehensive overview of the Periodic Table for OCR GCSE Chemistry. It covers atomic structure, groups, periods, and reactivity trends, with a strong focus on exam technique to help you secure top marks.

The Periodic Table and properties of elements

Eduqas·GCSE

WJEC-GCSE-Chemistry

Master the Periodic Table and the properties of elements with this comprehensive guide. Discover the fundamental trends in reactivity for Groups 1 and 7, learn the essential flame test colours, and understand why transition metals are crucial catalysts, all while applying examiner-approved techniques.

The rate and extent of chemical change

AQA·GCSE

8462

Master the rate and extent of chemical change, from calculating reaction speeds to predicting equilibrium shifts. This core GCSE Chemistry topic teaches you how to control chemical reactions—a vital skill for both your exams and the chemical industry.

Thermodynamics

AQA·A-Level

Thermodynamics (AQA 3.1.8) is the powerhouse topic of A-Level Chemistry, combining Born-Haber cycles — which reveal the true strength of ionic bonds through Hess's Law — with Gibbs Free Energy, the ultimate arbiter of whether a reaction can actually occur. Mastering this topic means understanding not just the maths, but the deep physical reasoning behind why ionic compounds form, why some reactions only happen at high temperatures, and why real ionic compounds deviate from the perfect ionic model. Examiners consistently reward candidates who can apply ΔG = ΔH − TΔS with precision and explain covalent character with chemical insight.

Thermodynamics

WJEC·A-Level

Master WJEC A-Level Thermodynamics by learning to construct perfect Born-Haber cycles and applying Gibbs Free Energy to predict reaction feasibility. This guide provides examiner insights, worked examples, and memory hooks to help you secure top marks.

Topic 1: Atomic Structure and the Periodic Table

Pearson Edexcel·A-Level

Pearson-A-Level-Chemistry

Master the essential rules of oxidation numbers and unlock the secrets of redox reactions. This topic is a massive mark-winner in exams, giving you the algebraic tools to track electron transfer, balance complex half-equations, and spot tricky disproportionation reactions.

Topic 2: Bonding and Structure

Pearson Edexcel·A-Level

Pearson-A-Level-Chemistry

Master the core principles of oxidation numbers and redox reactions. This essential guide breaks down electron transfer, half-equation balancing, and disproportionation to help you secure top marks in your GCSE Chemistry exams.