CaCO3 decomposes at 1200°C to form CO2 gas and Cao. If 25 L of CO2 are collected at 1200°C, what will the volume of this gas be after it cools to 25°C?

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.