C5

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  • C5
    • Moles, % composition and empirical formula
      • No of moles = Mass/Molar Mass
      • % composition = amount in element/amount in compound * 100
      • Empirical formulae = Most simple way of writing
    • Quantitative analysis
      • No of moles = concentration * volume
      • 1mol/dm3 - 0.1mol/dm3 = take 100cm3, add 900cm3 of water.
      • Food Labels, working out amount of salt
    • Titrations
      • Acid + alkali = salt + water
      • No of moles of acid = no of moles of alkali
    • Gas Volumes
      • No of moles = vol of gas dm3)/24
    • Equilibria
      • Balance of reactant and product
      • Temperature - Moves equilibrium towards reactantPressure - equilibrium towards the productCatalyst  - doesn't affect
      • Contact process
        • S+o2 = S02/ 2S02+02 = 2S03 / S03 = H20 = H2SO4.
    • Strong and weak acids
      • Strong acid = HCl
        • Total ionisation of atoms HCl ->H++cl-
      • Weak acid = CH3COOH
        • Part ionisation (reversable)
    • Ionic equations and precipitation
      • 1 - Filter off barium sulphate
      • 2. Dry and clean

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