4

Chemical Reactions

A chemical reaction produces products from suitable reactants.

    NH4NO3 N2O + 2H2O

    H2 + Cl2 2HCl

    NaOH + HCl NaCl + H2O

A reaction has taken place is shown by one or more of the following facts:

  1. A gas is evolved.

    Zn + H2SO4 ZnSO4 + H2

  2. A precipitate is formed.

    NaCl(aq) + AgNO3(aq) AgCl ↓ + NaNO3(aq)

  3. A colour change ...

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