This definitions covers Key Definitions 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 5 of 11 in this topic. Make sure you can use the exact wording confidently, because definition marks are often lost through vague language.
📖 Key Definitions
Simple molecular substance: A substance consisting of small molecules held together internally by strong covalent bonds, with weak intermolecular forces between different molecules.
Intermolecular forces: Weak forces of attraction between separate molecules (distinct from intramolecular covalent bonds which are within molecules).
Intramolecular bond: A bond within a molecule — the strong covalent bonds between atoms making up a molecule.
Boiling point: The temperature at which a liquid becomes a gas — determined by how much energy is needed to overcome intermolecular forces, not intramolecular bonds.
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.