Chemistry 2

OMG AMAZING REVISION OF C2... watch this space, more to come!

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  • Created by: aneesah
  • Created on: 19-11-12 16:47
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  • Chemistry 2
      • COVALENT
        • The sharing of electrons between atoms to create a full outer shell.
          • Happens between non metals
        • Giant covalent bonds
          • Eg diamonds,graphite and sillicon
          • Have low boiling points
        • Ions are electrically charged particles that are made when atoms gain/lose electrons
          • metal atoms = positve ions. Non-metal = negative ions
            • Metals lose electrons. Non-metals gain electrons
        • positve + negative = ionic bonds
        • High M.P and B.P
      • Size- from 1nm- 100nm
      • Useful catalysts because- large surface area, quick reactors
      • May lead to:
        • New catalysts. New coatings. New computers. Stronger and lighter building materials
    • Chemical structure
      • protons + neutrons = mass no.
      • atomic no. = proton
        • Percentage composition
          • 1. First, work out the relative formula mass of the compound using the atomic mass.
            • Ar = atomic mass
            • 2. Divide the Ar of the element by the Mr of the whole compound
              • 3. Multiply by 100 to get the percentage.
            • more than one atom of the element in the compound, you need to multiply your answer by the number of atoms.
      • Isotopes = same atom different no. of neutrons
      • add up the RAMs to find the total atomic mass of the compound
      • RAM in grams = mole
        • the total mass of products at the end of the reaction is equal to the total mass of the reactants at the beginning.
          • mass is always conserved
          • If mass is lost its because of:
            • some product may be lost when it is removed from the reaction mixture
              • or some of the reactants may react in an unexpected way
          • atom economy of a process tells you the proportion of atoms in the reactants that become part of a useful product
            • Processes with high atom economies are more efficient and produce less waste
  • Metals lose electrons. Non-metals gain electrons
  • Size- from 1nm- 100nm




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