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
