chemical changes

Amazing chemical reactions!
a chemical change is a reaction between sodium and water to produce sodium hydroxide and hydrogen.
Chemical changes occur when a substance combines with another to form a new substance, called synthesis or, alternatively,decomposes into two or more different substances.When chemical reactions occur, the atoms are rearranged and the reaction is accompanied by an energy change as new products are generated.
An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen.