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

Mix it, then make it

identify

Try it yourself

Silver and sulfur powders can be stirred together. When the stirred powders are heated, they react to form silver sulfide, the same black solid that forms as a dark layer on old silver spoons. Each statement describes either the stirred powders or silver sulfide. Match each statement to the substance it describes.

identify: name or select.

Match each item

1. Two kinds of grain, shiny grey and yellow, can be seen in it.

2. Every sample of it is 87% silver by mass.

3. It is black all through, unlike silver or sulfur.

4. One sample can be 20% sulfur, and another 60% sulfur.

5. Only a chemical reaction can get its silver back.

6. Its silver grains can be picked out with tweezers.

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Scope and sources

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

The differences between elements, compounds and mixtures (2.1 Core 1), with iron, sulfur and iron sulfide and with particle diagrams. Atomic structure, formulae and equations, separation methods and energy changes as such are left to their own modules.

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

Official Cambridge syllabus