Learning objective

Determine the formula of an ionic compound based on the relative quantities of ions shown in a model or diagram, or from their charges.

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

Exam focus

Cambridge IGCSE ChemistrySubject contentSupplement content

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Quick explanation

This point belongs to Formulae, especially Formulae outcomes.
You need to be able to determine the formula of an ionic compound based on the relative quantities of ions shown in a model or diagram, or from their charges.
The key ideas to know are Determine and Distinguish.
Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

DetermineDistinguish

Why it matters

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

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Practice Questions7 linked questions

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Paper 4Theory (Extended)1 marks

Description

A compound is formed from sodium ions (Na^+) and sulfate ions (SO4^2-). Determine the formula of the compound.

a
State the formula of the compound formed from sodium and sulfate ions.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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