Chemistry 1.1

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  • Created by: selen.
  • Created on: 18-04-15 15:40
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  • Chemistry 1.1
    • Amount of substances
      • 1 mol=amount of any substance w/ as many paricles at there are C (in 12g of C12)
        • So 12g of C12 contains 6x10^23 atoms
        • n
          • m
            • Mr
      • Avogadro constant is the number of atoms per mole of the carbon-12 isotope
    • Empirical Formula
      • Answer: So for Mg &Br this would be MgBr2
        • Step 3: this gives a ratio (e.g. 1:2)
          • Step 2:  ÷ by the smallest number
            • Step 1: divide the mass or % given by the Ar
    • Gas volumes
      • At RTP:
        • One mole of gas molecules occupies 24dm3
          • n
            • v
              • 24
        • The vol/mol of gas molecules is 24dm3mol-1
    • Moles and solutions
      • c
        • n
          • v
    • Acids and Bases
      • All acids contain hydrogen
        • Proton donor
        • the H+ ion is responsible for all acid reactions
          • H is always released
      • Common bases are hydr/oxides or organic compounds called amines
        • Proton acceptor
        • everyday uses: Mg(OH)2 (indigestion) or Ca(OH)2 (for acid soil)
        • Alkali's are more corrosive than acids
          • dissolves in water to form OH¯(aq)
    • Redox and Oxidation numbers
      • Oxidation is loss of e¯
      • Reduction is gain of e¯
      • Disproprtionation reaction is where a species is oxidised and reduced
        • Oxidation numbers
          • Uncombined element = 0
          • Combined O2 = -2
          • Combined H2 = +1
          • Simple ion = charge on ion

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