A sample is prepared by volumetrically transferring 7.85 mL of whiskey into a 50 mL volumetric flask and diluting to the volume mark with the diluent. The whiskey sample is analyzed and the concentration for 3-Methyl-1-butanol (3M1B) is calculated as 13.7 ppm. The concentration of 3M1B in the original whiskey sample is:

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i think it's letter a.

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.