Science 10 - Chemical Reaction Types A3.3

  1. Formation = simple composition (S.C.) (synthesis)

  • Two elements are added together to make a compound

  • Element A + Element B = Compound AB

Ex: Aluminium + chloride = 2AlCl3(aq)

  1. Simple Decomposition (SD)

  • Single compound is the reactant

  • Compound AB = A=B

2CuO(s) → 2Cu(s) + O2(g)

  1. Single Replacement (SR)

  • Reaction of an element with a compound

  • Element A + Compound BC → Element B + Compound AC

a) Metal element reacts with ionic compound to replace the metal ion in the compound.

Aluminium + sodium chloride → Aluminium chloride + sodium

b) Non-metals react with ionic compound

  • Non-metal + ionic compound → non-metal2 + ionic compound

ex: Calcium + water → calcium hydroxide + hydrogen

  1. Double Replacement (DR)

  • Two ionic compounds react and no new ions are formed

  • Compound AB + Compound CD → AD + CB

ex: Sodium carbonate + silver nitrate → calcium carbonate + sodium chloride

  1. Hydrocarbon Combustioin (HC)

  • Only happens in compounds with hydrogen and carbon in the presence of oxygen

  • Always result in carbon dioxide and water

Ex: Methane + oxygen → Carbon dioxide and water vapour