Module 7.6 Polymers

A sample of polydifluoroethylene is determined to have an average molar mass of 4.8 × 10⁴ g mol⁻¹.

Approximately how many carbon atoms are there in an average molecule?

• 750

• 1500

• 2500

• 4000

The structure of part of a polymer chain is shown.

Which statement best explains why plastics made from this polymer require a temperature of approximately 250°C before they begin to soften?

• The carbon–carbon bonds in the polymer chains are strong.

• The carbon–hydrogen bonds in the polymer chains are strong.

• Extensive dipole–dipole and dispersion forces exist between the polymer chains.

• Extensive hydrogen bonds and dispersion forces exist between the polymer chains.

The structure of part of a polymer chain is shown.

Which is the monomer of this polymer?

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What term is used to define the repeating unit of a polymer?

• Dimer

• Isomer

• Monomer

• Primer

A low molecular weight biopolymer is being investigated for its suitability for medical use. In one trial a molecular weight of 2900 ± 100 g mol⁻¹ proved to be optimum.

A section of this biopolymer is shown.

Which will produce the suitable biopolymer?

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Glycine, an amino acid, can react with itself or other amino acid monomers to form silk, a natural polymer.

Which monomer could react with glycine to form this section of silk polymer?

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