A compound formed by the chemical union of two or more monomers of the same kind is a(n) _____?

The correct answer is polymer, which refers to a substance made up of long chains of repeated units called monomers. In this context, when monomers of the same kind chemically bond together, they create a polymer through a process known as polymerization. This results in a compound that has different properties than the individual monomers, often exhibiting enhanced strength, flexibility, or other desirable characteristics depending on the specific monomers involved.

Polymers are prevalent in various materials, including plastics, fibers, and elastomers, showcasing their significance in both industrial applications and everyday products. Understanding the distinction between polymers and monomers is crucial, as it highlights the transformation that occurs during the chemical bonding process and the resulting complexity of the created substance.

The other options do not accurately characterize a compound formed by the chemical union of similar monomers. A mixture involves two or more substances that are not chemically bonded; an elastomer refers to a specific type of polymer with elastic properties; and a monomer is simply a single unit that can combine with others to form a polymer.