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Chemistry · Learn
47 lessons in 8 units, about 80 h of reading and core practice. Each lesson ends with a quick check.
Specification
Unit 1
Builds the quantitative, atomic and bonding ideas that underpin all later physical, inorganic and organic chemistry.
5 lessons · 8 h 30 min of study · ≈12% of the test
Unit 2
Covers energy changes, reaction rates and chemical equilibria, including the mathematical treatment needed at top grades.
10 lessons · 16 h 45 min of study · ≈20% of the test
Unit 3
Develops oxidation, reduction and electrochemical ideas from simple redox bookkeeping to electrode potentials and feasibility.
3 lessons · 5 h 15 min of study · ≈7% of the test
Unit 4
Applies periodic trends to the chemistry of key groups and selected p-block substances that recur across specifications.
3 lessons · 4 h 45 min of study · ≈6% of the test
Unit 5
Explores transition-metal chemistry and the qualitative tests needed to identify inorganic substances and ions.
4 lessons · 7 h 30 min of study · ≈10% of the test
Unit 6
Introduces the language, structures, mechanisms and first reaction families of carbon compounds.
6 lessons · 10 h 15 min of study · ≈13% of the test
Unit 7
Extends organic chemistry to aromatic, carbonyl and nitrogen compounds, polymers and multistep route design.
8 lessons · 13 h 45 min of study · ≈17% of the test
Unit 8
Develops the laboratory methods, data handling and cross-topic problem solving that written practical assessment demands.
8 lessons · 13 h 15 min of study · ≈17% of the test
Start here
Physical foundations · Lesson 1 of 5
This topic covers relative masses, the mole, empirical and molecular formulae, balanced equations, reacting masses, solutions and percentage yield/atom economy. Exams test fluent quantitative chemistry, often in multi-step calculations using equations, concentrations and practical data.
2 h of study≈4% of the test
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Every lesson is free to read. With an account, finished lessons are ticked off, quick checks feed your mastery, and flashcards come back for review.
Strategy, scoring and test day, beyond the syllabus.
Learn, then practise
Each lesson ends with three quick questions. For more, practice adapts to the topics you’re weakest on.
Open practice