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Cambridge IGCSE chemistry

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  1. States of matter
    States of matter
    3 Topics
  2. Changing state
    5 Topics
  3. Diffusion
    4 Topics
  4. Experimental techniques
    Taking measurements
    4 Topics
  5. Separation and purification
    4 Topics
  6. Chromatography
    2 Topics
Cambridge IGCSE chemistry Diffusion Rate of diffusion and molecular mass
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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