CAIE IGCSE Chemistry 3.1.1 Formulae of the elements & compounds

Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

Practise recalling and applying formulae for named elements and compounds in familiar reactions, tests and salt preparations.

How this is tested

choose correct compound formulae from ion names, including brackets for polyatomic ions

[Maximum number: 1]

Which row shows the formulae of sodium carbonate, zinc nitrate and ammonium sulfate?

sodium carbonate

zinc nitrate

ammonium sulfate

$\mathrm{Na}_{2} \mathrm{CO}_{3}$

$\mathrm{ZnNO}_{3}$

$\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}$

$\mathrm{Na}_{2} \mathrm{CO}_{3}$

$\mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2}$

$\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}$

$\mathrm{NaCO}_{3}$

$\mathrm{ZnNO}_{3}$

$\left(\mathrm{NH}_{3}\right)_{2} \mathrm{SO}_{4}$

$\mathrm{NaCO}_{3}$

$\mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2}$

$\left(\mathrm{NH}_{3}\right)_{2} \mathrm{SO}_{4}$