The chemical process described here is the conversion of methane $CH4$ to silver chloride $AgCl$ through various intermediate steps.

CH4 $Methane$ is oxidized to form CO2 $CarbonDioxide$.CO2 reacts with calcium hydroxide $Ca(OH)2$ to form calcium carbonate $CaCO3$.Calcium carbonate is decomposed into calcium oxide $CaO$ through thermal decomposition.Calcium oxide reacts with water to form calcium hydroxide $Ca(OH)2$.Calcium hydroxide is then converted to calcium chloride $CaCl$ through reaction with hydrochloric acid $HCl$.Finally, the silver chloride $AgCl$ is formed by reacting calcium chloride with silver nitrate $AgNO3$ to form a precipitate of silver chloride.

Overall, this chemical process involves a series of reactions starting from methane and ending with the formation of silver chloride.