Joanna owns a cupcake bakery in a small, coastal town. Reports of a large hurricane have caused Joanna to evacuate her town. The hurricane destroys many of the small towns and cities on the coast.

Which of the following groups should Joanna and other citizens support in building a new storm wall to protect the shoreline in the future?
A.
the federal transportation agency
B.
the neighborhood volunteer organization
C.
the local tourism department
D.
the state recovery bureau

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.