define a) PPL b) optical activity c) enantiomers
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Answer:
a)A private pilot licence (PPL) or, in the United States, a private pilot certificate, is a type of pilot licence that allows the holder to act as pilot in command of an aircraft privately (not for remuneration). ... However, most pilots require 60–70 hours of flight time to complete their training.
b)Optical activity, the ability of a substance to rotate the plane of polarization of a beam of light that is passed through it. ... Because the specific rotation depends upon the temperature and upon the wavelength of the light, these quantities also must be specified.
c)Enantiomers are chiral molecules that are mirror images of one another. Furthermore, the molecules are non-superimposable on one another. This means that the molecules cannot be placed on top of one another and give the same molecule. Chiral molecules with one or more stereocenters can be enantiomers.