Contents

States of matter

Atoms, elements and compounds

Stoichiometry

Electrochemistry

ElectrolysisBeing prepared
Electrolysis of solutions and electroplatingBeing prepared
Fuel cellsBeing prepared

Chemical energetics

Chemical reactions

Acids, bases and salts

Acids, bases and indicators
OxidesBeing prepared
Making saltsBeing prepared

The Periodic Table

Reading the tableBeing prepared
Group I: the alkali metalsBeing prepared
Group VII: the halogensBeing prepared
Transition elements and noble gasesBeing prepared

Metals

Metals and alloysBeing prepared
The reactivity seriesBeing prepared
CorrosionBeing prepared
Extracting metalsBeing prepared

Chemistry of the environment

WaterBeing prepared
FertilisersBeing prepared
Air quality and climateBeing prepared

Organic chemistry

Naming organic moleculesBeing prepared
Crude oil and alkanesBeing prepared
AlkenesBeing prepared
Alcohols and carboxylic acidsBeing prepared
PolymersBeing prepared

Experimental techniques and chemical analysis

Mixtures and separation
Measuring and planning experimentsBeing prepared
Crystallisation
Distillation
Paper chromatography
Choosing methods and checking purityBeing prepared
TitrationBeing prepared
Gas testsBeing prepared
Anion testsBeing prepared
Cation and flame testsBeing prepared

Part 1 of 2

Page 01

Heat it, then test it

identify

Try it yourself

Solid coconut oil is white and soft. A spoonful is warmed gently in a dish until it melts to a clear liquid. Then the dish is left in a cool room, and the oil sets to a white solid again. A pupil tests a piece from the start and a piece from the end: both can be scratched with a fingernail, both float on water and neither dissolves in it. Which answer identifies the change and gives the right reason?

identify: name or select.

Choose one answera.Chemical: the liquid looked different from the solidb.Physical: the solid at the end has the same propertiesc.Physical: it can be changed back by cooling itd.Chemical: it changed state when it was warmed

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Scope and sources

Cambridge IGCSE Chemistry 0620 · 2026–2028 v2 · Original learning materials.

Physical and chemical changes (6.1 Core 1): identifying physical and chemical changes and describing the difference in terms of whether any new substances have been made. Rates of reaction are in the next module, reversible reactions in 6.3 and the tests for gases in topic 12.

Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.

Official Cambridge syllabus