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CAIE IGCSE Chemistry 11.1.7 Structural formula is an unambiguous

Practise recognising structural formulae such as HCOOH or CH3CH=CH2 and using them to show how atoms are arranged in molecules.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • interpret condensed structural formulae to show the arrangement of atoms in a molecule

11.1.7—Structural formula is an unambiguous question 1

[Maximum number: 1]

The equation for the reaction between methanoic acid and ethanol in the presence of a catalyst can be represented as shown.

HCOOH+CH3CH2OH⇌X+H2OΔH=−29.5 kJ/mol\mathrm{HCOOH}+\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} \rightleftharpoons \mathbf{X}+\mathrm{H}_{2} \mathrm{O} \quad \Delta H=-29.5 \mathrm{~kJ} / \mathrm{mol}

X represents the ester formed.

In the equation, methanoic acid is represented by the formula HCOOH .

Name this type of formula.

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