Tips
IGCSE Chemistry (0620) runs from states of matter and atomic structure through stoichiometry, electrochemistry, energetics, rates, acids and bases, the Periodic Table, metals, environmental chemistry and organic chemistry, ending with experimental techniques and analysis.
Stoichiometry decides grades. It appears in its own questions and again inside electrochemistry, energetics and rates, so time spent on moles pays back several times over.
The other reliable loss is equations: unbalanced, missing state symbols, or an ionic equation written out in full. Papers exist for six components, split between Core and Extended — confirm which you are sitting before you revise.
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1
States of matter
Watch lesson- 1.1 The three states of matter
- 1.1 Changes of state
- 1.1 Gases: temperature, pressure and volume
- 1.2 Diffusion
- 1.2 Exam tips
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2
Atoms, elements and compounds
Watch lesson- 2.1 Elements, compounds and mixtures
- 2.2 Atomic structure
- 2.3 Isotopes
- 2.4 Ions and ionic bonds
- 2.5 Simple molecules and covalent bonds
- 2.6 Giant covalent structures
- 2.7 Metallic bonding
- 2.7 Exam tips
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3
Stoichiometry
Watch lesson- 3.1 Chemical formulae
- 3.1 Writing equations
- 3.2 Relative masses
- 3.3 The mole
- 3.3 Doing reaction calculations
- 3.3 Exam tips
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4
Electrochemistry
Watch lesson- 4.1 Electrolysis
- 4.2 Hydrogen–oxygen fuel cells
- 4.2 Exam tips
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5
Chemical energetics
Watch lesson- 5.1 Exothermic and endothermic reactions
- 5.1 Enthalpy change, ΔH
- 5.1 Activation energy
- 5.1 Reaction pathway diagrams
- 5.1 Bonds and energy
- 5.1 Exam tips
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6
Chemical reactions
Watch lesson- 6.1 Physical and chemical changes
- 6.2 Rate of reaction
- 6.3 Reversible reactions and equilibrium
- 6.4 Redox
- 6.4 Exam tips
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7
Acids, bases and salts
Watch lesson- 7.1 Acids
- 7.1 Bases and alkalis
- 7.1 Strong and weak acids
- 7.1 The pH scale
- 7.2 Oxides
- 7.3 Preparing salts
- 7.3 Exam tips
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8
The Periodic Table
Watch lesson- 8.1 Arrangement of the elements
- 8.2 Group I — the alkali metals
- 8.3 Group VII — the halogens
- 8.4 Transition elements
- 8.5 Group VIII — the noble gases
- 8.5 Exam tips
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9
Metals
Watch lesson- 9.1 Properties of metals
- 9.2 Uses of metals
- 9.3 Alloys
- 9.4 The reactivity series
- 9.5 Corrosion of metals
- 9.6 Extraction of metals
- 9.6 Exam tips
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10
Chemistry of the environment
Watch lesson- 10.1 Water
- 10.2 Fertilisers
- 10.3 Air quality and climate
- 10.3 Exam tips
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11
Organic chemistry
Watch lesson- 11.1 Formulae and key words
- 11.2 Naming organic compounds
- 11.3 Fuels
- 11.4 Alkanes
- 11.5 Alkenes
- 11.6 Alcohols
- 11.7 Carboxylic acids
- 11.8 Polymers
- 11.8 Exam tips
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12
Experimental techniques and chemical analysis
Watch lesson- 12.1 Experimental design
- 12.2 Acid–base titrations
- 12.3 Chromatography
- 12.4 Separation and purification
- 12.5 Identifying ions and gases
- 12.5 Exam tips
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