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.
Practise OCR GCSE Chemistry Properties of materials with exam-style questions for Foundation and Higher tier. 60 questions, matched to the OCR GCSE Chemistry (J248) specification and written in Paper 1 and Paper 2 (Foundation Tier) or Paper 3 and Paper 4 (Higher Tier) style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.