33 content lessons covering every Specific Objective in the three sections of the CXC CSEC Chemistry syllabus, plus 6 exam-preparation lessons (including Paper 032) with a timed mock paper and 4 practical and SBA lessons. Every lesson has a narrated explainer video with worked examples, key notes, Paper 1 and Paper 2 style practice, and a readiness score — no login, no install.
Each lesson’s readiness = video watched (20%) + best multiple-choice score (40%) + self-marked structured answers (40%). Paper 1 readiness = content lessons (50%) + Paper 1 mock (30%) + lesson X1 (20%). Paper 2 = content lessons (60%) + Paper 2 mock, lesson X2 (40%). Paper 3 (SBA) = practicals and SBA lessons (60%) + lessons X3–X6 on Paper 03 and Paper 032 (40%). Overall = Paper 1 × 30% + Paper 2 × 50% + Paper 3 × 20%, the same weights as CSEC Chemistry (30 / 50 / 20). Progress is saved in this browser only.
111 quick games across the lessons — sort, sequence, match and Myth or Fact — plus the Chemistry Arcade. Win XP to level up and unlock badges. Games are practice for fun: they do not change your exam readiness.
| Paper | What it is | Time | Weight |
|---|---|---|---|
| Paper 01 | 60 multiple-choice items covering all three sections (60 marks: Knowledge and Comprehension 50, Use of Knowledge 10) | 1 h 15 min | 30% |
| Paper 02 | 6 compulsory questions: Question 1 data analysis (25 marks), Questions 2 and 3 structured (15 marks each) and Questions 4 to 6 (15 marks each) — 100 marks | 2 h 30 min | 50% |
| Paper 03/1 (SBA) | Practical work assessed by your teacher in four skills (130 raw marks weighted to 40); Paper 03/2 (Paper 032) is the alternative for private candidates: three questions, 2 h 10 min | Over the course | 20% |
Source: CXC CSEC Chemistry Syllabus (CXC 21/G/SYLL 13), “Format of the Examination” and Table 1 (Paper 01: 60 marks; Paper 02: 100 marks; Paper 03: 40 marks; 200 raw marks in all, weighted 30 / 50 / 20).
States of matter, mixtures and separations, atomic structure, the periodic table, bonding, the mole, acids, bases and salts, redox, electrochemistry, rates of reaction and energetics.
Pure substances and mixtures, elements and compounds, atoms and molecules, and the difference between solutions, suspensions and colloids, including the types of solution.
How temperature affects the solubility of solids, and how to choose and describe filtration, evaporation, crystallisation, simple and fractional distillation, chromatography and the separating funnel, including sugar extraction.
How ionic bonds form by transfer of electrons, dot-and-cross diagrams for ionic compounds, predicting whether a bond is ionic or covalent, and writing formulae for ions and ionic compounds.
How atoms share electrons to form covalent bonds, dot-and-cross diagrams for common molecules (single, double and triple bonds), writing molecular formulae and the properties of simple molecular substances.
Metallic bonding, ionic crystals, simple molecular crystals and giant molecular crystals (diamond and graphite), and how structure explains melting point, solubility and conductivity.
The mole and the Avogadro constant, molar mass, converting between mass, moles and number of particles, percentage composition, empirical formula, Avogadro’s law, molar volume and the conservation of matter.
Writing and balancing molecular and ionic equations with state symbols, using equations to calculate reacting masses and gas volumes, and molar and mass concentration with standard solutions.
Definitions of acid, base, alkali, salt, anhydride and the types of oxide, the pH scale, strong and weak acids and alkalis, and acids in living systems.
How acids react with metals, bases, carbonates and hydrogencarbonates, neutralisation and its uses, preparing soluble and insoluble salts, and the solubility rules of salts.
How to carry out and record an acid–base titration, choose an indicator, identify concordant titres, and use the results with the mole ratio to find a concentration.
The difference between metallic and electrolytic conduction, strong and weak electrolytes, what happens at the anode and cathode, and how to predict the products of electrolysis of molten and aqueous compounds.
Factors that affect the products of electrolysis, the Faraday constant, calculating the mass or volume of a product from current and time, and industrial electrolysis: electroplating, purification, aluminium and chlorine.
Sources of hydrocarbons, homologous series and naming, reactions of alkanes, alkenes, alcohols and carboxylic acids, esters, soaps and polymers.
Combustion and substitution of alkanes, addition reactions of alkenes (hydrogenation, halogenation, hydration), the test for unsaturation, and how the properties of hydrocarbons relate to their uses.
Identifying alcohols, acids and esters by functional groups, how properties depend on the –OH and –COOH groups, the reactions of ethanol, fermentation, and the reactions of ethanoic acid.
How esters are made and hydrolysed, saponification of fats and oils to make soap, how soap and soapless detergents work, and how they compare in hard water and in their environmental impact.
Metals and their reactivity, extraction and uses, impact of metals, non-metals and the environment, water, green chemistry and qualitative analysis.
Physical and chemical properties of metals, how metals react with oxygen, water and acids, how to rank them in the reactivity series, displacement reactions, and the thermal stability of compounds.
How the method of extraction depends on a metal’s position in the series, the blast furnace for iron, electrolysis of molten compounds for reactive metals (aluminium), and the uses of metals and alloys.
Using aqueous sodium hydroxide, aqueous ammonia and potassium iodide to identify Pb²⁺, Al³⁺, Ca²⁺, Zn²⁺, Fe³⁺, Fe²⁺, Cu²⁺ and NH₄⁺, with ionic equations and a systematic method.
Tests for carbonate, sulfate, sulfite, nitrate and the halide ions, the laboratory tests for the common gases including water, and how to plan an unknown-identification investigation.
How each CSEC Chemistry paper works, technique for data analysis, calculations and extended response, a full timed Paper 01 mock with 60 items, and Paper 032 preparation.
How Paper 01 is built (60 items, 75 minutes), how its marks are split between knowledge and use of knowledge, techniques for working and checking answers, and a timed 60-item mock exam.
How Paper 02 is built (data analysis plus structured questions, 100 marks), how to answer command words, graphs, calculations and equations, and a mini mock to self-mark.
How to earn the 30 Experimental Skills marks and 10 Use of Knowledge marks in Paper 032: hypotheses, variables, methods, tables, graphs, calculations, sources of error and conclusions.
A full 40-mark Paper 032 style practice paper with three questions — acid–base titration, rate of reaction, and an investigation of conductivity — with marks tagged for experimental skills and use of knowledge.
A second full 40-mark Paper 032 style practice paper with three questions — identifying an unknown salt, preparing copper(II) sulfate crystals, and electrolysis of copper(II) sulfate — with marks tagged for experimental skills and use of knowledge.
The eight required practicals, the SBA skills (manipulation and measurement; observation, recording and reporting; planning and designing; analysis and interpretation) and the investigative project (Paper 031).
A guide to the eight practical topics that must be included in the SBA: separation techniques; acids, bases and salts; redox reactions and electrolysis; qualitative analysis; volumetric analysis; rates of reaction; energetics; and saturated and unsaturated hydrocarbons.
What teachers look for in the first two SBA skills (30 marks each): using apparatus correctly, taking accurate readings, recording observations, and writing a clear lab report.
The CXC marking criteria for the Proposal (10 marks) and Implementation (20 marks) of an investigation: hypothesis, aim, method, variables, results, discussion, limitations, reflections and conclusion.
A full investigation written in the CXC reporting format — Part A (proposal) and Part B (implementation) — on how temperature affects the rate of reaction between sodium thiosulfate and hydrochloric acid, with the marks each section earns.