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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
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Lesson 3, Topic 1
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What is diffusion
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Diffusion is the spreading of one substance into another due to the random motion of the particles
Diffusion is explained by the kinetic particle theory. Particles collide randomly with each other leading to complete mixing of the particles
Diffusion in gases is faster than diffusion in liquids because the particles in gases move faster
Diffusion does not happen in solids because the particles are fixed in position
The overall movement of particles is from where they are more concentrated to where they are less concentrated