Which of the following is made from groups of hydrocarbon molecules?

Plastics are indeed made from groups of hydrocarbon molecules. They are synthetic materials created through the polymerization of monomers, which are often derived from fossil fuels. The hydrocarbon structure of these monomers primarily consists of carbon and hydrogen atoms, allowing them to form long chains or networks that characterize different types of plastics. This molecular composition contributes to the versatility, durability, and lightweight nature of plastic materials.

In contrast, metals are composed of metallic elements bonded by metallic bonds, which do not involve hydrocarbon structures. Ceramics are primarily inorganic compounds made from minerals and do not consist of hydrocarbon molecules, whereas glass is generally made from silica (SiO2) and other inorganic materials rather than hydrocarbons. Therefore, the defining characteristic of plastics as being made from hydrocarbon molecules sets them apart from the other materials listed.