Which statements are correct?
Statement 1: When a gas condenses, energy is released as forces form between the particles.
Statement 2: The boiling point of a simple molecular substance depends on the strength of the covalent bonds in its molecules.
Statement 3: A substance with a melting point of −10 ∘C-10\,^\circ\mathrm{C}−10∘C and a boiling point of 110 ∘C110\,^\circ\mathrm{C}110∘C is a liquid at 100 ∘C100\,^\circ\mathrm{C}100∘C.
Statement 4: When a solid melts, the particles gain energy and the forces between them become stronger.
1 and 2 only
1 and 3 only
2 and 4 only
1, 3 and 4 only
60 exam-style questions on OCR GCSE Chemistry 2.3 Properties of materials, covering 2.3.1 Carbon bonding and the variety of organic compounds, 2.3.2 Diamond, graphite, fullerenes and graphene, 2.3.3 Bond strength, changes of state and predicting states, 2.3.4 Bulk properties and types of bonding, and 2.3.5 Nanoparticles: scale, surface area, uses and risks. Each one has a worked solution and a mark scheme showing where the marks go.