Frequently Examined
Simple molecules feature in most chemistry papers. The most common question patterns:
- Explain the low melting point of a named simple molecular substance — always reference "weak intermolecular forces" not "weak covalent bonds" (2 marks)
- Explain why it doesn't conduct electricity — "no ions and no free electrons" (2 marks)
- Compare melting points of two simple molecular substances of different sizes (2 marks)
- Identify the type of structure from given properties (low MP, doesn't conduct) (1 mark)
A question may give you unfamiliar molecules — apply the same principles. If it's simple molecular: low MP, doesn't conduct, often liquid or gas at room temperature.
Edexcel 1CH0: Examined in Paper 1 (1CH0/1). Edexcel tests simple molecular structures through explain questions on low melting point (weak intermolecular forces, NOT weak covalent bonds) and non-conductivity (no ions, no free electrons). Comparing melting points of two simple molecules of different size is a common 2-mark question. In Edexcel-style questions, the command word "Suggest" appears frequently — use your chemistry knowledge to apply to an unfamiliar context.
This exam focus covers Exam Focus within Simple Molecules for GCSE Chemistry. Revise Simple Molecules in Bonding & Structure for GCSE Chemistry with 20 exam-style questions and 21 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 9 of 11 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Practice questions for Simple Molecules
Which type of force holds simple molecules together as a substance?
Explain why chlorine (Cl2) has a low boiling point.