The chemical equation you provided is the decomposition of calcium carbonate (CaCO3) into calcium oxide (CaO) and carbon dioxide (CO2). It's written correctly in terms of the reactants and products, but we can make it a bit more complete:

CaCO3(s) → CaO(s) + CO2(g)

Here's what each part means:

* CaCO3(s): Calcium carbonate, in its solid state (s)

* →: Yields (meaning it reacts to form)

* CaO(s): Calcium oxide, in its solid state (s)

* CO2(g): Carbon dioxide, in its gaseous state (g)

Important Note: This reaction requires heat to occur. It's a classic example of a thermal decomposition reaction.