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Cambridge IGCSE 2023

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  1. States of matter
    States of matter
    3 Topics
    1. The three states of matter
    2. The particle model
    3. Past paper questions (states of matter)
  2. Changes of state
    5 Topics
    1. Changing state
    2. Boiling and evaporation
    3. The effect of temperature and pressure on particles
    4. Explaining changes of state (S)
    5. Past papers (changes of state)
  3. Heating a cooling curves
    3 Topics
    1. Change of state and temperature change
    2. Heating curves
    3. Past papers (heating ad cooling curves)
  4. Movement of particles
    4 Topics
    1. What id diffusion ?
    2. Rate of diffusion and molecular mass
    3. The effect of pressure and temperature on particles
    4. Diffusion past paper questions
Cambridge IGCSE 2023 Movement of particles Rate of diffusion and molecular mass
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Lesson 4, Topic 2
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Rate of diffusion and molecular mass

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Diffusion and molecular weight

  • 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