Chemistry

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  • Chemistry
    • Elements are materials made up of one type of atom only
      • Compounds contain two or more different types of atom
      • Mixtures are not chemically joined so, they're not pure subtances
    • Protons are positive, electrons are negative & neutrons are neutral
      • The nucleus is a dense core  of protons and neutrons containing nearly all the mass of the atom
      • The number of protons in an atom is known as its atomic number
    • Electron Arrangement- Number of electrons per shell in an atom, e.g. 2,8,8
    • Atoms can bond by sharing electrons, and by giving or taking electrons
      • Metals and non-metals transfer electrons to form Ionic Bonds- Metals form a positive ion and non-metals form a negative ion
      • Non-metals share electrons to form Covalent Bonds
    • Word Equations summarise what is happening in a chemical reaction
      • Formula Equations are the same as word Equations   except they're in symbols
      • Balancing Equations are equations with the same type and number of an atom, on both sides of the equation
      • Reactants are what you start with and Products are what you finish with
    • Limestone is a sedimentary rock. It is mainly made up of calcium carbonate but, has a mixture of other substances
    • Thermal Decomposition is a reaction that breaks down metal carbonates when they are heated strongly
    • Calcium carbonate- Limestone, Calcium Hydroxide- Slaked lime, Calcium oxide- Quicklime
  • Metals and non-metals transfer electrons to form Ionic Bonds- Metals form a positive ion and non-metals form a negative ion

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