Cambridge IGCSE Chemistry
3.2Relative masses of atoms and molecules
Relative masses of atoms and molecules in Cambridge IGCSE Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives
What the syllabus expects you to be able to do.
- 3.2.1Describe relative atomic mass, Ar, as the average mass of the isotopes of an element compared with one-twelfth of the mass of a carbon-12 atom.
- 3.2.2Define relative molecular mass, Mr, as the sum of the relative atomic masses (relative formula mass for ionic compounds), and calculate it from a formula.
- 3.2.3Calculate reacting masses in simple proportion, without using the mole.
Lessons
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Relative atomic, molecular and formula masses
30 min
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Sample question
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