Which statement correctly explains why thermosetting polymers are rigid and do not melt when heated, whereas thermosoftening (thermoplastic) polymers can be repeatedly melted and reshaped?
Thermosetting polymers have weak intermolecular forces between polymer chains.
Thermosetting polymers contain strong covalent cross-links between adjacent polymer chains.
Thermosoftening polymers contain strong covalent cross-links that allow the chains to slide over one another easily.
Thermosoftening polymers are held together by ionic bonds, making them highly flexible.
48 exam-style questions on OCR GCSE Chemistry Properties of materials. Each one has a worked solution and a mark scheme showing where the marks go.