What do all types of steel have in common a: all alloys are made mostly of iron b: all are ionic compounds made from iron and nonmetals c: all are alloys that contain either iron, aluminum, or copper d: all are alloys made mostly of nonmetals

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.