This exam tips covers Exam Tips for Simple Molecules 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 10 of 11 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
💡 Exam Tips for Simple Molecules
🎯 Common Question Types:
- Explain the low melting/boiling point of a simple molecular substance (2 marks)
- Explain why it does not conduct electricity (2 marks)
- Compare boiling points of two simple molecules of different sizes (2 marks)
- Identify structure type from properties (1 mark)
📝 Key Command Words:
- Explain: Reference weak intermolecular forces, little energy needed to overcome them
- Compare: Bigger molecule = more intermolecular forces = higher melting point
- Identify: Low MP + no conduction = simple molecular structure
- Describe: Strong bonds within molecules, weak forces between molecules
⚠️ Common Mistakes to Avoid:
- Saying "weak covalent bonds" cause the low melting point — NEVER write this
- Forgetting that the molecules remain intact when melting/boiling
- Saying simple molecules "have no bonds" — they have covalent bonds, just not between molecules
- Comparing simple molecules to ionic compounds without reference to the type of force
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.
Quick recall flashcards
What does molecular formula show?
Number and type of atoms in one molecule (e.g., H₂O, CO₂, CH₄)
What are intermolecular forces?
Weak forces of attraction between different molecules