: 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.
Quick Answer. A CD cover is typically 4.75 inches by 4.75 inches. These figures may vary as long as the CD cover accommodates the disc, which has a diameter of 4.65 inches. Album covers used to come in much bigger formats, as 78 rpm records came in both 10-inch and 12-inch diameter sizes. It was only in the mid-1990s that the compact disc found its way into the market. Then albums started to come in small plastic cases. Amid the age of downloads in 2014, the use of physical packaging such as CD covers has changed.