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Learning objective

Determine the formula of a simple molecular compound based on the number of atoms shown in a model or diagram.

Read the explanation, check the common trap, then practise with flashcards and questions.

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Exam focus

  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE Combined ScienceStoichiometryCore content

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Quick explanation

Determine the formula of a simple molecular compound based on the number of atoms shown in a model or diagram

  • This point belongs to Formulas, especially Formulas outcomes.
  • You need to be able to determine the formula of a simple molecular compound based on the number of atoms shown in a model or diagram.
  • The key ideas to know are Deduce.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

Deduce

Why it matters

This objective helps connect Formulas outcomes to exam-style questions, flashcards, and revision notes for Formulas.

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Practice Questions7 linked questions

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Paper 3 structured question: Formulas

Paper 3Theory (Core)1 marks

Diagram Description

Water Molecule Diagram

The diagram shows two hydrogen atoms bonded to one oxygen atom.

  1. a

    Identify the formula of the water molecule shown in the diagram.

    Aim for approximately 1 distinct marking point.

    [1]
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Cambridge IGCSECombined Science resources