Chemistry C1a: Rocks and Building (AQA)

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What you are expected to know:

  • All substances are made of atoms that have a tiny central nucleus surrounded by electrons.
  • The simplest substances contain only one type of atom and are called 'elements'
  • Atoms of each element have their own chemical symbol
  • The periodic table lists all the known elements in groups with similar chemical properties
  • Elements form compounds by combining with other elements: their atoms give, take or share electrons, so they bond together.
  • The formula of a substance shows the types of atom it contains and how many have combined together.
  • In chemical reactions, the mass of the reactants is always the same as the mass of the products
  • Chemical equations are balanced. There is the same number of each type of atom on each side.
  • Limestone is used as a building material and to make quicklime, slaked lime, cement and glass.
  • Heating metal carbonates produces metal oxides and carbon dioxide gas.

Atoms, elements and compounds

  • There are about 100 different elements from which all substances are made
  • Elements are listed in the periodic table
  • Each element is made of one type of atom.
  • Atoms are represented by a chemical symbol, e.g. Na for sodium, O for oxygen.
  • Atoms have a tiny nucleus surrounded by electrons. When elements react their atoms join with atoms of other elements
  • Atoms form chemical bonds by losing, gaining or sharing a small number…

Comments

Eloise van Biljon

Maybe too much writing and not enough diagrams though x

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