AQA A-Level Chemistry Paper 3, 2021: Question 24

1 mark · Easy difficulty · Multiple Choice

This question assesses your understanding of intermolecular forces in polymer structures. It focuses on identifying which polymer can form hydrogen bonds between its chains, which significantly influences properties like strength and melting point. You’re expected to recognise the presence of functional groups (such as –NH or –OH) capable of hydrogen bonding in polymers.

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Question

AQA A-Level Chemistry Paper 3, 2021: Question 24
Question text

24 Which polymer has hydrogen bonding between the polymer chains?

[1 mark]

A Kevlar

B PVC

C poly(phenylethene)

D Terylene

Mark scheme

Show the mark scheme Mark scheme for AQA A-Level Chemistry Paper 3, 2021: Question 24

24 A 1 Kevlar

How to answer it

Multiple Choice Explained: Hydrogen Bonding in Polymers

Correct Answer: A – Kevlar

Why? Kevlar has both N–H and C=O groups in its polymer backbone. These groups can form hydrogen bonds between chains, giving Kevlar its high tensile strength and toughness.

Why B is incorrect:

PVC (polyvinyl chloride) contains polar C–Cl bonds but no groups capable of forming hydrogen bonds between chains. It has dipole-dipole interactions, not hydrogen bonding.

Why C is incorrect:

Poly(phenylethene) (polystyrene) has no O–H or N–H groups. It relies on weak van der Waals forces between chains, not hydrogen bonding.

Why D is incorrect:

Terylene (PET) is a polyester. While it contains C=O groups, it lacks the N–H or O–H groups needed for strong hydrogen bonding between chains.

Topics

Organic Chemistry · 3.3.12 Polymers

Question and mark scheme from the AQA A-Level Chemistry examination, Paper 3, 2021. QuestionVault is an independent revision resource; questions remain the copyright of the awarding body.