| − | A change which affects the type of [[molecule]]s or [[atom]]s in a substance.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref> | + | A '''chemical change''' is a change which affects the type of [[molecule]]s or [[atom]]s in a substance.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref> |