Page 10 Chemical Reactions

by J

Reaction types

5 major types of chemical reactions:,decomposition,synthesis,single replacement and double replacement and combustion

Reactant Types

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Synthesis reaction

  • Synthesis Reaction- two or more chemical species combine to form a more complex product.
    A + B =ab
  • The combination of iron and sulfur to form iron (II) sulfide is an ex of a synthesis reaction ;
8 Fe + S8 =8FeS

Chemical Decomposition

  • Chemical Decomposition-a compound is broken into smaller chemical species.
    AB = A + B
  • The electrolysis of water into oxygen and hydrogen gas is an example of a decomposition reaction:
    2 H2O = 2 H2 + O2

Single Displacement

  • single displacement one element being displaced from a compound by another element. A + BC = AC + B
  • when zinc combines with hydrochloric acid. The zinc replaces the hydrogen:

Zn + 2 HCl = ZnCl2 + H2

Double Dispalcement

  • in a double displacement or two compounds exchange bonds or ions in order to form different compounds.AB + CD = AD +CB
  • a double displacement reaction occurs between sodium chloride and silver nitrate to form sodium nitrate and silver chloride.

NaCl(aq) + AgNO3(aq) = NaNO3(aq) + AgCl(s)


  • combustion -is a reaction in which oxygen reacts with another element or com pound (generally a hydrocarbon) to produce energy g in the form of heat and light. An example might be the combustion of methanol
  • C2H6 + O2 ---> CO2 + H2O

steps for balancing chemical equations

  1. Check for diatomic molecules.
  2. Balance the metals not .
  3. Balance the nonmetals.
  4. Balance oxygen.
  5. Balance hydrogen.
  6. The equation should now be balanced, but recount all atoms to be sure.
  7. Reduce coefficients.

Balanced Examples

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