This reaction is showing the decomposition of calcium hydroxide (Ca(OH)2) into calcium carbonate (CaCO3) and calcium oxide (CaO), with the formation of calcium chloride (CaCl2) as a byproduct.

The balanced chemical equation for this reaction is:

Ca(OH)2 → CaCO3 + CaO + CaCl2

This reaction is a form of thermal decomposition, where the calcium hydroxide breaks down into its component compounds when heated.