Cambridge IGCSE Combined Science practice

Paper 4 structured question: Formulas

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Paper

Marks

Topic

Formulas

Exam-style question

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Paper 4Theory (Extended)1 marks

Determining the formula of ionic compounds from given ions.

Description

You are given the following ions: Calcium (Ca^2+) and Chloride (Cl^-). Determine the formula for the ionic compound formed from these ions.

a
Determine the formula of the ionic compound formed from calcium and chloride ions.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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Paper 4Theory (Extended)2 marks

Description

Given the ions: Aluminum (Al^3+) and Oxide (O^2-), determine the formula for the ionic compound they form.

a
Analyse the charges of aluminum and oxide ions to find the formula of the compound.
Your answer
Aim for approximately 2 distinct marking points.
[2]