When substances combine with oxygen the process is called oxidation and the compounds made are called oxides. The sparks in fireworks are made by burning different metals. The burning metals are ...

Chemical reactions occur when elements or compounds combine and create new compounds. Elements are substances that contain only one type of atom and are represented by unique symbols on the periodic ...

There are lots of different substances but only just over a hundred elements. An element is a substance that is made up of only one kind of atom. The atoms in a particular element are the same as each ...