Chemistry C1 AQA GCSE part 2

HideShow resource information
  • Created by: pixar
  • Created on: 20-06-14 10:24
View mindmap
  • Chemistry C1 GCSE AQA Triple Award Part 2
    • electron shells
      • rules
        • the closest shells get filled 1st
        • only certain amounts of electrons are allowed on each shell
          • 4th shell - 16
          • 3rd shell - 8
          • 1st shell - 2
          • water H2O
            • insert electron shells diagram here
          • 2nd shell - 8
        • atoms without a full outer shell are reactive because they need more electrons
        • atoms that have a full outer shell are not reactive
        • electrons always occupy shells
      • diagram
        • stick electron shell diagram here
    • compounds
      • atoms join together to make compounds
        • when different elements react, atoms form chemical bonds
          • its usually difficult to seperate the two original elements again
        • making bonds involves atoms taking, giving or sharing electrons
          • the nucleus isn't involved
        • a compound made from a metal and non - metal consists of ions
          • the metal atoms lose electrons to form positive ions
            • the opposite charges mean that they are attracted to each other which is called ionic bonding
              • stick ionic bond diagram here
          • the non - metal atoms gain electrons to form negative ions
            • the opposite charges mean that they are attracted to each other which is called ionic bonding
              • stick ionic bond diagram here
        • a compound made from non - metals consist of molecules
          • each atom shares an electron
            • this is called covalent bonding
              • stick covalent bond picture here
    • balancing equations
      • atoms aren't lost or made in chemical equations
        • during a chemical reaction things don't just appear or dissapear
          • because of this the mass of the reactants equal the mass of the product
        • you still have the same atoms at the end as there are at the start
        • balanced symbol equations show the atoms at the start and at the end and show how they are arranged
      • balancing the equation
        • there must be the same number of atoms at both sides
        • you balance the equation by putting numbers infront of the formulas when needed
      • diagram stick here
  • making bonds involves atoms taking, giving or sharing electrons
    • the nucleus isn't involved

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all all topics in C1 resources »