Chemistry gcse

how do you identify the metal carbonate? ? how would you know if something is a metal carbonate? ? (if it's in a word equations not symbol) would it just have the metal name and carbonate at the end? like calcium carbonate?

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.