A laboratory technician investigates a newly prepared substance, Q.
Substance Q consists of separate small molecules. Strong covalent bonds hold the atoms together within each molecule, and weak intermolecular forces act between the molecules.
The technician measures the melting point, boiling point and electrical conductivity of Q when solid and when liquid.
Which set of results should the technician expect?
Low melting and boiling points; does not conduct when solid but conducts when liquid
Low melting and boiling points; does not conduct when solid or liquid
High melting and boiling points; does not conduct when solid or liquid
High melting and boiling points; does not conduct when solid but conducts when liquid
122 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.