Lesson 4.7.1.3

4.7.1.3 Properties of hydrocarbons Quiz: AQA Chemistry, Unit 7

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.7.1.3, Properties of hydrocarbons: 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 7: Organic chemistry, written with Revision Ninja.

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The 20 questions

  1. How does viscosity change as hydrocarbon molecules get larger?

    • Drops to zero
    • Stays constant
    • Decreases
    • Increases

  2. Which of the following is a physical property of hydrocarbons that depends on molecular size?

    • Atomic mass
    • Proton number
    • Flammability
    • Neutron count

  3. What are the products of the complete combustion of a hydrocarbon?

    • Carbon monoxide and water
    • Carbon dioxide and water
    • Carbon and hydrogen
    • Methane and oxygen

  4. During combustion of hydrocarbon fuels, which elements are oxidised?

    • Calcium only
    • Sodium and chlorine
    • Oxygen and nitrogen
    • Carbon and hydrogen

  5. What happens to energy during the combustion of hydrocarbon fuels?

    • It remains constant
    • It is released
    • It is destroyed
    • It is absorbed

  6. Which property describes how thickly a liquid hydrocarbon flows?

    • Solubility
    • Flammability
    • Viscosity
    • Volatility

  7. What term describes how easily a fuel catches fire?

    • Boiling point
    • Solubility
    • Flammability
    • Viscosity

  8. Which word describes a reaction in which a substance combines with oxygen and releases energy?

    • Electrolysis
    • Combustion
    • Neutralisation
    • Precipitation

  9. Write the balanced equation for complete combustion of methane, CH4.

    • CH4 + 2O2 -> CO2 + 2H2O
    • CH4 + O2 -> C + 2H2O
    • CH4 + 2O2 -> CO + 2H2O
    • CH4 + O2 -> CO2 + H2O

  10. Which balanced equation shows complete combustion of propane, C3H8?

    • C3H8 + 5O2 -> 3CO2 + 4H2O
    • C3H8 + 3O2 -> 3CO2 + 4H2O
    • C3H8 + 5O2 -> 3CO2 + 3H2O
    • C3H8 + 5O2 -> 3C + 4H2O

  11. Which balanced equation shows complete combustion of pentane, C5H12?

    • C5H12 + 6O2 -> 5CO2 + 6H2O
    • C5H12 + 8O2 -> 5CO + 6H2O
    • C5H12 + 8O2 -> 5CO2 + 5H2O
    • C5H12 + 8O2 -> 5CO2 + 6H2O

  12. Which hydrocarbon is more flammable: methane or a long-chain alkane?

    • Both are equal
    • Long-chain alkane
    • Methane
    • Neither is flammable

  13. Which hydrocarbon has the higher boiling point: C2H6 or C10H22?

    • C2H6
    • C10H22
    • Both are equal
    • Neither boils

  14. Which hydrocarbon has a higher viscosity: C4H10 or C10H22?

    • Neither has viscosity
    • Both are equal
    • C4H10
    • C10H22

  15. In complete combustion, the carbon in a fuel is converted into which product?

    • Solid carbon
    • Carbon dioxide
    • Carbon monoxide only
    • Hydrogen gas

  16. One molecule of C6H14 burns completely. How many water molecules form?

    • 3
    • 14
    • 6
    • 7

  17. How does flammability compare between short-chain and long-chain hydrocarbons?

    • Neither burns
    • Short-chain is higher
    • Long-chain is higher
    • Both are identical

  18. Why do larger hydrocarbon molecules have higher boiling points?

    • Stronger intermolecular forces
    • Stronger covalent bonds
    • Increased density
    • Higher nuclear charge

  19. One molecule of a hydrocarbon burns completely and forms 3 molecules of carbon dioxide. Which hydrocarbon is it?

    • Ethane, C2H6
    • Butane, C4H10
    • Propane, C3H8
    • Methane, CH4

  20. Why is hydrocarbon combustion classified as oxidation?

    • Loss of carbon
    • Gain of oxygen
    • Gain of hydrogen
    • Loss of electrons

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