JAMB Chemistry: Topics to Focus On for 2027
JAMB Chemistry topics to focus on for 2027, from the syllabus structure: must-master moles and bonding, commonly tested areas and lower-weight topics.
ExamPadi Editorial · Updated · 8 min read
Chemistry has a reputation for being a subject you either "get" or you do not. In practice, it is a subject with a few key ideas that repeat everywhere: particles, bonds, moles and reactions. Once those four are secure, new topics look familiar rather than strange. This guide organises the JAMB Chemistry syllabus for the 2027 cycle into three tiers so you know where to put your first hours.
We do not claim exact question-frequency percentages, because JAMB does not publish a topic-by-topic breakdown we can verify. "Commonly tested" is our editorial judgement of topics that come up often in practice sets or that underpin many others, not an official count. Confirm the current syllabus, the exam format and the time allowed on jamb.gov.ng.
The map of the syllabus
The ExamPadi subject outline lists: the periodic table, chemical bonding, stoichiometry, acids, bases and salts, electrolysis, organic chemistry, hydrocarbons, polymers, industrial chemistry and environmental chemistry. These sit alongside the basics of matter, separation techniques, gases, energy changes and rates of reaction.
| Group | Topics |
|---|---|
| Foundations | Matter, separation of mixtures, atomic structure, periodic table |
| Bonding and structure | Ionic, covalent, metallic bonding, intermolecular forces |
| Quantities | Mole concept, stoichiometry, gas laws, concentration |
| Reactions | Acids, bases, salts, redox, electrolysis, rates, energy changes |
| Element families | Metals, non-metals and their compounds |
| Carbon chemistry | Organic chemistry, hydrocarbons, polymers |
| Applied | Industrial and environmental chemistry |
Tier 1: must-master topics
Atomic structure and the periodic table
Why it matters: electron arrangement explains periodic trends, bonding and reactivity. If you can write electron configurations, many later questions become reasoning rather than recall.
How to practise: write the electron arrangement of the first twenty elements, then predict the group, the type of ion and the bonding of each. Learn the trends in atomic radius, ionisation energy and electronegativity across a period and down a group.
Chemical bonding
Why it matters: bonding explains properties such as melting point, conductivity and solubility, which are commonly examined.
How to practise: make a four-row table for ionic, covalent, metallic and giant covalent structures, with columns for particles, melting point, conductivity and examples. Draw dot-and-cross diagrams for simple compounds.
The mole concept and stoichiometry
Why it matters: nearly every calculation in the subject uses moles. A single reliable method saves time and prevents errors.
How to practise: use the same path for every question: balanced equation, moles of the given substance, mole ratio, moles of the wanted substance, then convert to mass, volume or concentration. An original example: How many moles of oxygen are needed to burn 2 moles of methane (CH₄ + 2O₂ → CO₂ + 2H₂O)? The ratio is 1 : 2, so 2 moles of methane need 4 moles of oxygen.
Acids, bases and salts
Why it matters: this topic combines definitions, indicators, pH, neutralisation and salt preparation, and it links to titration calculations.
How to practise: learn the definitions, the strong and weak acid distinction and the methods for preparing soluble and insoluble salts as a decision path.
Tier 2: commonly tested topics
| Topic | Why it matters | How to practise |
|---|---|---|
| Gas laws | Boyle's, Charles's and the general gas law | Convert to kelvin and keep units consistent |
| Redox and electrolysis | Oxidation numbers, half-equations, products at electrodes | Write half-equations and name the electrode |
| Rates and equilibrium | Factors affecting rate, Le Chatelier's principle | Make a table of changes and their effects |
| Energy changes | Exothermic and endothermic, bond energies, enthalpy | Draw energy profile diagrams |
| Metals and their compounds | Reactivity series, extraction, uses | Learn the reactivity series and extraction methods by group |
| Non-metals | Hydrogen, oxygen, nitrogen, sulphur, halogens | Tabulate preparation, properties and tests |
| Organic chemistry | Homologous series, naming, isomerism, reactions | Draw structures and name them from the carbon count |
An original naming task: Name the hydrocarbon with three carbon atoms and one double bond. It is propene.
Tier 3: lower-priority topics
Cover these once the first tiers are secure; the order is ours, not JAMB's.
- Polymers: know addition and condensation polymerisation and a few examples.
- Industrial chemistry: learn the main processes named in your syllabus and the raw materials.
- Environmental chemistry: learn pollution types, causes and control in a cause–effect–control table.
- Colloids and detailed separation methods: know the definitions and uses.
- Nuclear chemistry basics: know the ideas at the syllabus level.
Study order that works
| Week | Focus |
|---|---|
| 1 | Matter, atomic structure, periodic table |
| 2 | Bonding, structure and properties |
| 3 | Mole concept, stoichiometry, gas laws |
| 4 | Acids, bases, salts, redox, electrolysis |
| 5 | Metals, non-metals, organic chemistry |
| 6 | Industrial and environmental chemistry, timed mixed sets |
Pair this plan with the method in how to pass JAMB Chemistry. Practical-style ideas, such as safe handling, observations and reading apparatus diagrams, are explained in WAEC Chemistry practical tips and help with objective questions on experiments. If you are also taking Physics, see JAMB Physics topics to focus on.
How to practise by topic
Chemistry errors fall into three kinds: a concept you misunderstood, a calculation you fumbled, or a fact you forgot. Label every wrong answer with one of the three. Concept errors send you back to the notes, calculation errors need more worked examples, and memory errors need flashcards or a table. Retry the topic after a few days and see which label is shrinking.
Practise it
Use ExamPadi's free JAMB Chemistry questions and timed CBT mode (on Android, iOS, web and Windows) to check each tier before you move on. Start at JAMB Chemistry practice, and read how to score 300 in JAMB to see how this subject fits into your overall score plan. No resource can guarantee a result, but a priority-based plan will make your time count.
Practise with real past questions and worked answers
Practise JAMB Chemistry freeFrequently asked questions
Which Chemistry topic should I learn first?
Begin with atomic structure and the periodic table, then chemical bonding and the mole concept. They explain why substances behave as they do and they underpin calculations later.
How much of JAMB Chemistry is calculation?
A fair share, mostly short mole-based and gas-law questions. They are manageable once you have a method for the mole and for balancing equations.
How do I remember the reactivity series and the tests for gases?
Use short rhymes or mnemonics you create yourself, then test them in questions. Group tests for gases and ions in a table and revise it weekly.
Do I need to read organic chemistry in detail?
Yes, at the syllabus level. Learn the homologous series, naming, functional groups and key reactions, and practise drawing structures.