C. A chemist is given the job of recovering silver ions, Ag+, from a solution before the solution is discarded. She is given the job because silver is expensive and may be reused.

Answer questions 1-3 about the chemist's task.

If the solution is AgNO3, what chemical could she add in order to extract the silver from the

solution? *

a. Cu+

b. NaCI

c. NaNO3

d. HNO3

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.