CIE IGCSE Chemistry

Revision Notes

7.1.1 Physical & Chemical Changes

Physical & Chemical Change

Physical change

  • Physical changes (such as melting or evaporating) do not produce any new chemical substances
  • These changes are often easy to reverse and mixtures produced are usually relatively easy to separate

Chemical change

  • In chemical reactions, new chemical products are formed that have very different properties to the reactants
  • Most chemical reactions are impossible to reverse
  • Energy changes also accompany chemical changes and energy can be given out (exothermic) or taken in (endothermic)
  • The majority of chemical reactions are exothermic with only a small number being endothermic

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