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Cambridge IGCSE Chemistry practice

Paper 3 structured question: Relative masses of atoms and molecules

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Relative masses of atoms and molecules

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Paper 3Theory (Core)3 marks

Calculating relative atomic mass involves understanding isotopes.

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Isotopes and Relative Atomic Mass

Isotopes are atoms of the same element with different numbers of neutrons, affecting the average atomic mass.

  1. a

    Explain how the relative atomic mass of an element is determined.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 3 structured question: Relative masses of atoms and molecules

Paper 3Theory (Core)1 marks

Description

Understanding Relative Atomic Mass

Relative atomic mass is defined as the average mass of an element's isotopes in relation to 1/12th of the mass of a carbon-12 atom.

  1. a

    State the definition of relative atomic mass.

    Aim for approximately 1 distinct marking point.

    [1]