Home › Subjects › A-Level H2 Chemistry
H2 Chemistry revision: mole calculations, kinetics and equilibria
Junior college, working toward the Singapore-Cambridge GCE A-Level. Rae explains, marks and drills H2 Chemistry with your level in mind. Free to try, no install.
Build physical chemistry around a small set of decisions: what reacts, how fast it reacts, and what remains at equilibrium. These original 9476 practice lessons connect equations with their assumptions.
Start with a complete lesson
H2 Chemistry mole calculations: limiting reagents and gas quantities
Two worked examples, an independent question and common mistakes.
H2 reaction kinetics: initial rates, rate constants and half-life
Two worked examples, an independent question and common mistakes.
H2 equilibrium: Kc expressions, reaction tables and changing conditions
Two worked examples, an independent question and common mistakes.
H2 acid-base equilibria: pH, weak acids and buffers
Two worked examples, an independent question and common mistakes.
A revision routine you can repeat
- Begin with quantities and the balanced equation. Separate the stoichiometric limit from an equilibrium yield.
- For kinetics, infer orders from data. For equilibrium, use equilibrium composition and state the temperature.
- Practise justifying approximations as well as calculating answers. Keep an error log of missing assumptions, units and scientific explanations.
Scope: H2 Chemistry 9476, examination year 2026. Check the official syllabus. For 2027 SEC, check your school’s G3 syllabus; do not assume the examination label and code stay the same.
Print the H2 Chemistry: physical chemistry decision sheet
What Rae does for Chemistry
- Help with balanced equations, reacting quantities and written explanations.
- Use sources and your syllabus to check chemical claims.
- Structures, mechanisms and diagrams rendered properly.
- Snap a photo of the problem, send a voice note, or attach the file.
- Revisit topics with Rae’s notes and practice tools.
Use the SEAB syllabus for A-Level H2 Chemistry (9476) to check which skills you need to practise.
Topics
The make-up of the atom and how its electrons are arranged
Syllabus expectations, worked examples and practice.
How atoms bond and how that governs a substance's behaviour
Syllabus expectations, worked examples and practice.
Ideal gases and working with gas mixtures
Syllabus expectations, worked examples and practice.
Competing definitions of acids and bases
Syllabus expectations, worked examples and practice.
Trends in the elements across a period and down a group
Syllabus expectations, worked examples and practice.
The mole and reacting-quantity calculations
Syllabus expectations, worked examples and practice.
Enthalpy, entropy and the feasibility of reactions
Syllabus expectations, worked examples and practice.
Reaction rates, rate laws and catalysis
Syllabus expectations, worked examples and practice.
Reversible reactions and the position of equilibrium
Syllabus expectations, worked examples and practice.
pH, dissociation constants and buffers
Syllabus expectations, worked examples and practice.
Solubility product and the common ion effect
Syllabus expectations, worked examples and practice.
Representing organic molecules and their shapes
Syllabus expectations, worked examples and practice.
Structural isomerism and stereoisomerism
Syllabus expectations, worked examples and practice.
Terminology and mechanisms of organic reactions
Syllabus expectations, worked examples and practice.
Reactions of alkanes, alkenes and arenes
Syllabus expectations, worked examples and practice.
Substitution and elimination in halogen compounds
Syllabus expectations, worked examples and practice.
Chemistry of alcohols and of phenol
Syllabus expectations, worked examples and practice.
Reactions and tests for aldehydes and ketones
Syllabus expectations, worked examples and practice.
Carboxylic acids, acyl chlorides and esters
Syllabus expectations, worked examples and practice.
Amines, amides and amino acids
Syllabus expectations, worked examples and practice.
Addition and condensation polymers, and proteins
Syllabus expectations and practice.
Redox, electrode potentials and electrolysis
Syllabus expectations, worked examples and practice.
Properties and complexes of first-row transition metals
Syllabus expectations, worked examples and practice.
See also: which topics come up most in past papers.
How the exam is structured
Paper 1 (Multiple Choice)
- Multiple choice (30 marks): Thirty multiple-choice items, of which roughly five to eight are of the multiple-completion type
Paper 2 (Structured Questions)
- Structured questions (75 marks): A varying number of structured questions, including data-response items that reward higher-order handling and evaluation of information and integration across topics
Paper 3 (Structured Questions)
- Section A (55 marks): Three to four structured questions that draw together ideas from different areas of the syllabus
- Section B (20 marks): Extended structured questions that integrate knowledge from across the syllabus
Paper 4 (Practical)
- Practical assessment (50 marks): Hands-on practical tasks assessing experimental skills C1 to C5 across the areas Planning, Manipulation/measurement/observation, Presentation of data, and Analysis/conclusions/evaluation; may also include data-analysis items needing no equipment
What the exam rewards
- A Recall and grasp of chemical facts, terminology, apparatus and techniques, measured quantities, and the wider applications of the subject (36% of the marks)
- B Working with information: locating, organising and presenting it, processing numerical and other data, spotting patterns and drawing inferences, building reasoned arguments, and applying chemical principles to unfamiliar situations (44% of the marks)
- C Carrying out, recording, interpreting, planning and evaluating practical investigations safely and accurately (20% of the marks)
How it works
Open Rae on the web or in Telegram. Ask a question, attach your working or use voice. Read the explanation, try a follow-up question and use the notes and practice tools to revisit what you learned. AI feedback can make mistakes; check it against your syllabus and your teacher’s guidance.