A model maker prepares particle models for a science centre. Sticks represent covalent bonds, flexible links represent intermolecular forces and movable beads represent delocalised electrons.
Statement 1: The silicon dioxide model should contain many separate units, with only a few atoms joined by sticks in each unit.
Statement 2: The poly(ethene) model should have sticks along each long chain and flexible links between neighbouring chains.
Statement 3: The chlorine model should have flexible links holding the two atoms within each molecule together and sticks joining neighbouring molecules.
Statement 4: In the aluminium model, the movable beads should be able to pass through the whole arrangement of positive ions.
Which statements are correct?
1, 2 and 4 only
2 and 4 only
1 and 2 only
2 and 3 only
122 exam-style questions on OCR GCSE Chemistry 2.2 Bonding, covering 2.2.1 Metals, non-metals and the Periodic Table, 2.2.2 Types of chemical bonding and dot and cross diagrams, 2.2.3 Limitations of bonding models, and 2.2.4 Reactivity, atomic number and the modern Periodic Table. Each one has a worked solution and a mark scheme showing where the marks go.