Poly(ethene) melts at about 120 ∘C120\ ^\circ\text{C}120 ∘C. Diamond melts at about 3550 ∘C3550\ ^\circ\text{C}3550 ∘C. Both substances contain only covalent bonds. Which statement explains this difference?
Melting diamond overcomes only the forces between its molecules
Melting diamond breaks the weak covalent bonds within its structure
Melting poly(ethene) breaks the covalent bonds within its molecules
Melting poly(ethene) overcomes only the forces between its molecules
42 exam-style questions on AQA GCSE Chemistry 2.2 How bonding and structure are related to the properties of substances, covering 2.2.1a The three states of matter, 2.2.1b Limitations of the simple particle model, 2.2.2 State symbols in chemical equations, 2.2.3 Properties of ionic compounds, 2.2.4 Properties of small molecules, 2.2.5 Polymers, 2.2.6 Giant covalent structures, 2.2.7 Properties of metals and alloys, and 2.2.8 Metals as conductors. Each one has a worked solution and a mark scheme showing where the marks go.