A Level Chemistry OCR Practice Exam

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What is the definition of a monomer?

A large molecule made of repeating units
A small molecule that combines with other monomers to form polymers
A compound composed of two different elements
A form of a polymer that has not fully reacted

The correct answer is: A small molecule that combines with other monomers to form polymers

The definition of a monomer is a small molecule that combines with other monomers to form polymers. Monomers serve as the building blocks of larger, more complex structures known as polymers. When monomers undergo polymerization, they chemically bond together, leading to the formation of long chains or networks that constitute these polymers. The context of other options helps clarify why they do not fit the definition of a monomer. The first option describes a polymer itself, which is formed from multiple monomer units. The third option focuses on compounds composed of different elements, which does not pertain specifically to the concept of monomers and polymers. The fourth option refers to an incomplete polymer, which is not aligned with the definition of a monomer but rather a stage in polymer development.