A promising redox system for the thermochemical splitting of water involves the cerium oxides CeO2 and Ce2O3. Write balanced equations concerning the thermal decomposition of CeO2 to Ce2O3, and the reaction of the latter with steam to produce hydrogen. Combine the reactions to show that the overall process corresponds to the decomposition of water into hydrogen and oxygen.

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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.