: an isomer that is a stereoisomer of a compound having two or more chiral centers and that is not a mirror image of another stereoisomer of the same compound â
A compact disc is a deceptively simple looking device considering the technology required to make it. 1  CDs consist of three layers of materials: 2  A base layer made of a polycarbonate plastic. 3  A thin layer of aluminum coating over the polycarbonate plastic. 4  A clear protective acrylic coating over the aluminum layer.
1 Regular plastic is made from petroleum that is pollutant and have toxins; while PLA is from derived from corn based resin, which is non-toxic and renewable resource. 2  Regular plastic takes approximately 400 years to degrade, leaving toxicity in the environment. Regular plastic is made from petroleum that is pollutant and have toxins; while PLA is from derived from corn based resin, which is non-toxic and renewable resource. 2  Regular plastic takes approximately 400 years to degrade, leaving toxicity in the environment.