one or more new substances are produced in a chemical change. In addition to new products,
the following may accompany a chemical change:
1 Heat, light or any other radiation (ultraviolet, for example) may be given off or absorbed.
2 Sound may be produced.
3 A change in smell may take place or
4 new smell may be given off.
5 A colour change may take place .
6 A gas may be formed.