Making Synthetic Materials Practice Test

Nylon fibers are made from petroleum-based chemicals. Small molecules react to form very long nylon chains, and the melted polymer is then spun into fibers for fabric. Which description best explains how nylon production is a chemical process?

A bioplastic called PLA can be made from plant material such as corn or sugarcane. A simplified pathway is: plant sugars/starch → lactic acid → PLA plastic (a polymer). Which statement best describes the chemical transformation from lactic acid to PLA?