Asolution of hydrofluoric acid, hf(ag), is at equilibrium. how would the
system change if more hf were added to the solution?
o
a. less ht and more f would be produced.
o
b. more ht and f would be produced.
o
c. less ht and f would be produced.
o
d. more ht and less f would be produced.

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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.