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Cambridge IGCSE chemistry
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States of matterStates of matter3 Topics
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Changing state4 Topics
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Diffusion4 Topics
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Atoms, elements and compoundsElements, compounds and mixtures
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Atomic structure and the Periodic Table
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Isotopes
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Ions and ionic bonds
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Simple molecules and covalent bonds
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Giant covalent structures
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Metallic bonding
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StoichiometryFormulas of compounds3 Topics|1 Quiz
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Chemical equations5 Topics
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Relative atomic and molecular mass2 Topics
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Moles2 Topics
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Calculating masses in reactions3 Topics
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Percentage yield and percentage purity2 Topics
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Empirical and molecular formulae2 Topics
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Moles and concentration2 Topics
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Calculating gas volumes
Quizzes
Lesson 3, Topic 2
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Rate of diffusion and molecular mass
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The mass of molecules are compared by using relative molecular masses, Mr
The higher the value of Mr the heavier the molecule
Molecules with lower Mr move faster than molecules with higher Mr