Lesson 4.2.2.4

4.2.2.4 Properties of small molecules Quiz: AQA Chemistry, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.2.2.4, Properties of small molecules: 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 2: Bonding, structure, and the properties of matter, written with Revision Ninja.

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The 20 questions

  1. What are substances made of small molecules usually?

    • Polymers
    • Gases or liquids
    • Giant lattices
    • Metals

  2. What melting and boiling points do small molecular substances typically have?

    • Variable metal
    • Absolute zero
    • Relatively low
    • Extremely high

  3. What are the weak forces between small molecules called?

    • Ionic bonds
    • Metallic bonds
    • Intermolecular forces
    • Covalent bonds

  4. What is broken when a small molecular substance melts?

    • Covalent bonds
    • Metallic bonds
    • Ionic bonds
    • Intermolecular forces

  5. Why do small molecular substances fail to conduct electricity?

    • Mobile ions present
    • Strong covalent bonds
    • Free delocalised electrons
    • No overall charge

  6. How do intermolecular forces change as molecule size increases?

    • They stay constant
    • They increase
    • They disappear
    • They decrease

  7. How do melting points change as molecular size increases?

    • They increase
    • They decrease
    • They stay constant
    • They reach zero

  8. What forces are overcome when a small molecular substance boils?

    • Metallic bonds
    • Ionic bonds
    • Intermolecular forces
    • Covalent bonds

  9. Which physical state feature is typical of small molecules?

    • Very high density
    • Low boiling point
    • Giant lattice structure
    • Metallic luster

  10. Which substance is a small molecular gas at room temperature?

    • Iron
    • Diamond
    • Oxygen
    • Sodium chloride

  11. Which substance is a small molecular liquid at room temperature?

    • Sodium chloride
    • Water
    • Iron
    • Diamond

  12. A substance with small molecules has a boiling point of -183 C. Which state is it at 20 C?

    • Solid
    • Liquid
    • Metallic solid
    • Gas

  13. Compare two molecular substances: methane has smaller molecules than decane. Which has the higher boiling point?

    • Neither boils
    • Decane
    • Methane
    • They are equal

  14. Why do substances consisting of small molecules fail to conduct electricity?

    • Mobile metal ions
    • Strong ionic bonds
    • Free electrons
    • No overall charge

  15. What do weak intermolecular forces help to explain?

    • Atomic mass numbers
    • Electron shell counts
    • Bulk physical properties
    • Proton numbers

  16. Where are intermolecular forces located relative to molecules?

    • Inside atoms
    • Between molecules
    • Around nuclei
    • Within molecules

  17. Why are small molecules usually gases or liquids at room temperature?

    • Weak intermolecular forces
    • High atomic mass
    • Strong ionic lattices
    • Giant covalent bonding

  18. Why does a larger molecule have a higher boiling point?

    • Lower molecular mass
    • Stronger intermolecular forces
    • Stronger covalent bonds
    • Fewer electrons

  19. What is the typical electrical conductivity of small molecular substances?

    • Conduct when solid
    • Conduct when liquid
    • Conduct when molten
    • Do not conduct

  20. How does a small molecule's melting point compare to a metal's?

    • Always identical
    • Much higher
    • Much lower
    • Exactly equal

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