Lesson 4.2.2.6

4.2.2.6 Giant covalent structures Quiz: AQA Chemistry, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.2.2.6, Giant covalent structures: 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. Which substance has a giant covalent structure?

    • Silicon dioxide
    • Methane
    • Sodium chloride
    • Water

  2. What must be broken to melt a giant covalent substance?

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

  3. What type of melting point do giant covalent structures typically have?

    • Very high
    • Moderate
    • Low
    • Variable

  4. Name two giant covalent forms of carbon.

    • Diamond and graphite
    • Oxygen and ozone
    • Fullerene and ice
    • Methane and propane

  5. What is the typical melting point of a solid with a giant covalent network?

    • Low
    • Below zero
    • Very high
    • Medium

  6. Why does silicon dioxide melt at a much higher temperature than iodine?

    • Delocalised electrons
    • Hydrogen bonding
    • Weak ionic bonds
    • Strong covalent bonds

  7. What feature distinguishes a giant covalent structure from a simple molecular substance?

    • Mobile ions
    • Delocalised sea
    • Continuous network
    • Separate molecules

  8. What type of bond joins the atoms in silicon dioxide?

    • Metallic bonds
    • Ionic bonds
    • Covalent bonds
    • Hydrogen bonds

  9. Which physical property is typical of diamond?

    • Low density
    • Soft structure
    • Very hard
    • Low melting point

  10. Silicon dioxide is commonly known by which name?

    • Silane
    • Silica
    • Sodium silicate
    • Silver chloride

  11. A table lists A (silica, melts near 1700 degrees C) and B (ice, melts at 0 degrees C). Which is more likely a giant covalent structure?

    • Neither
    • A
    • B
    • Both equally

  12. Why do giant covalent structures lack separate molecules?

    • Ionic lattices
    • Weak forces
    • Continuous bonding
    • Gaseous state

  13. What forces hold separate molecules together in a simple molecular substance?

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

  14. Which chemical change requires breaking strong covalent bonds?

    • Subliming dry ice
    • Melting iodine
    • Boiling water
    • Melting silicon dioxide

  15. Why do giant covalent substances have higher boiling points than simple molecular substances?

    • Bonds are stronger
    • They have ions
    • Mass is lower
    • They are gases

  16. Why do most giant covalent solids not conduct electricity?

    • They are liquids
    • Protons can move
    • They contain ions
    • No free electrons

  17. What event happens first at the particle level when a giant covalent solid melts?

    • Molecules separate
    • Covalent bonds break
    • Electrons leave
    • Ions drift apart

  18. How are atoms bonded together in a giant covalent structure?

    • Electrostatic attraction
    • Shared electron pairs
    • Transferred electrons
    • Weak dipole forces

  19. Which bonding type gives silica its very high melting point?

    • Strong covalent bonds
    • Weak covalent bonds
    • Metallic bonding
    • Intermolecular forces

  20. What physical property is characteristic of giant covalent substances?

    • Low boiling point
    • High melting point
    • Liquid state
    • Soft texture

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