Chemical change

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Chemical changes are the changes in a substance through chemical reactions. The chemical reactants form a new product with equal mass.

The following evidence can indicate that a chemical change took place, although this evidence is not conclusive:


For example, placing a pot of water on a hot stove element causes a change in temperature and gas to be released (water vapor) but a chemical change did not take place, it was simply a physical change / change of state.

A chemical reaction produces new substances by changing the way in which atoms are arranged. In a chemical reaction old bonds are broken and new bonds are formed between different atoms. This breaking and forming of bonds takes place when particles of the original materials collide with one another.

Compare: physical change

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