For the chemical reaction c2h6 + 137 kj → c2h4 + h2, the chemical energy of a. reactant is greater than the chemical energy of the products.. b. products is greater than the chemical energy of the reactant.. c. reactant and the chemical energy of the products are equal.. d. reaction is conserved.

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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.