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Chemistry 0620 (Cambridge O Level / IGCSE)

Original practice questions with long-form, step-by-step worked solutions, organised by the 0620 syllabus strands. Everything here is free to read.

Subject code
0620
Tier
Core & Extended
Topics
15
Worked questions
150

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Official Cambridge references: 0620 syllabus ↗ · past papers ↗

States of matter

States of Matter and Diffusion

Describe solids, liquids and gases and changes of state using the kinetic particle model; interpret heating and cooling curves; explain diffusion and how…

10 worked questions

Atoms, elements and compounds

Atomic Structure and Isotopes

Describe protons, neutrons and electrons and their relative charges and masses; use proton and nucleon numbers to work out electronic configurations; explain…

10 worked questions

Chemical Bonding (Ionic, Covalent and Metallic)

Explain how ions and ionic lattices form, draw dot-and-cross diagrams for simple covalent molecules, and link bonding type to properties; giant covalent…

10 worked questions

Stoichiometry

The Mole and Stoichiometry

Write chemical formulae and balanced equations; use relative atomic and molecular mass; convert between mass, moles and molar mass; reacting-mass, gas-volume…

10 worked questions

Electrochemistry

Electrolysis

Predict and explain the products of electrolysing molten compounds and aqueous solutions; write electrode half-equations (Supplement); describe electroplating…

10 worked questions

Chemical energetics

Exothermic and Endothermic Reactions

Classify reactions as exothermic or endothermic from temperature changes; interpret and draw reaction pathway diagrams with activation energy; explain…

10 worked questions

Chemical reactions

Rates of Reaction

Describe and investigate how concentration, pressure, surface area, temperature and catalysts change reaction rate; interpret rate graphs; explain the effects…

10 worked questions

Redox Reactions

Identify oxidation and reduction in terms of oxygen gain/loss; use oxidation numbers and electron transfer (Supplement); recognise oxidising and reducing…

10 worked questions

Reversible Reactions and Equilibrium

Recognise reversible reactions and the ⇌ symbol, including hydrated salts; describe dynamic equilibrium and predict how temperature, pressure and…

10 worked questions

Acids, bases and salts

Acids, Bases and Salts

Describe reactions of acids with metals, bases and carbonates; use indicators and the pH scale; classify oxides; prepare soluble salts and choose a…

10 worked questions

The Periodic Table

The Periodic Table and Group Trends

Relate position in the Periodic Table to electronic configuration and metallic character; describe and predict trends in Group I and Group VII; properties of…

10 worked questions

Metals

Reactivity Series and Metal Extraction

Place metals in order of reactivity from their reactions with water, steam and acids; use displacement reactions as evidence; relate reactivity to extraction…

10 worked questions

Chemistry of the environment

Chemistry of the Environment

Describe water treatment and tests for water; NPK fertilisers; the composition of clean air, sources and effects of air pollutants, the greenhouse effect and…

10 worked questions

Organic chemistry

Hydrocarbons: Alkanes and Alkenes

Use general formulae, displayed formulae and homologous-series ideas; name simple organic compounds; describe fractional distillation of petroleum and fuels…

10 worked questions

Experimental techniques and chemical analysis

Chemical Tests for Ions and Gases

Identify cations using aqueous sodium hydroxide and aqueous ammonia, anions with the standard reagent tests, and common gases (hydrogen, oxygen, carbon…

10 worked questions