Before molten glass is pressed into shape, graphite is applied to the mould surface. The shaped glass can be released from the mould, and the graphite remains solid during heating. Which pair of statements about graphite explains these observations?
Weak forces between its layers let the layers slide, and melting requires many strong covalent bonds to be broken.
Small graphite molecules roll across one another, and strong intermolecular forces hold each molecule together during heating.
Delocalised electrons let its layers slide, and the movement of these electrons gives graphite a high melting point.
Strong covalent bonds between its layers let the layers slide, and melting requires only weak forces to be overcome.
68 exam-style questions on AQA GCSE Chemistry 2.3 Structure and bonding of carbon, covering 2.3.1 Diamond, 2.3.2 Graphite, and 2.3.3 Graphene and fullerenes. Each one has a worked solution and a mark scheme showing where the marks go.