Suppose you observe a change in the relationship between short-term and long-term bonds. specifically, you note that although interest rates on both short-term and long-term bond are rising together, as expected, the rate on long-term bonds is not rising by as much as has been observed in the past.

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.

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