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CAIE IGCSE Chemistry 3.1.1 Formulae of the Elements and Compounds Questions

Write and interpret chemical formulae for acids, salts, oxides and other compounds.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • write formulae for ionic and covalent compounds
  • name compounds from their chemical formulae
  • deduce formulae from ions and chemical information
  • identify formulae of acids, salts and oxides
  • apply chemical formula conventions to unfamiliar compounds

CAIE IGCSE Chemistry 3.1.1 Formulae of the Elements and Compounds Questions question 1

[Maximum number: 1]

Caffeine is a stimulant found in coffee.

caffeine

caffeine

Which formula represents caffeine?

A

C7H10 N4O2\mathrm{C}_{7} \mathrm{H}_{10} \mathrm{~N}_{4} \mathrm{O}_{2}

B

C8H10 N3O2\mathrm{C}_{8} \mathrm{H}_{10} \mathrm{~N}_{3} \mathrm{O}_{2}

C

C8H10 N4O2\mathrm{C}_{8} \mathrm{H}_{10} \mathrm{~N}_{4} \mathrm{O}_{2}

D

C8H11 N4O2\mathrm{C}_{8} \mathrm{H}_{11} \mathrm{~N}_{4} \mathrm{O}_{2}

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