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AQA A-level Chemistry — Practice Questions flashcards

6 of 66 questions free to study here · 3 topics · the whole deck is built into Willys

Multiple-choice practice questions, one best answer each, across AQA A-level Chemistry: atomic structure, moles, bonding, energetics, kinetics, equilibria, electrochemistry, acids, inorganic and organic chemistry, and spectroscopy.

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Practice deck · part of AQA A-level Chemistry · written against: AQA AS and A-level Chemistry (7404/7405) specification, version 1.2, July 2026 (physical, inorganic and organic). Updated 2026-10-10.

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  1. Which species contains more electrons than neutrons?

    A) ²³Na⁺
    B) ¹⁹F
    C) ¹⁶O²⁻
    D) ²⁴Mg²⁺
    C) ¹⁶O²⁻

    ¹⁶O²⁻ has 8 protons, 8 neutrons and 10 electrons. ¹⁹F has 9 electrons but 10 neutrons, and the two cations have lost electrons.
    Physical Chemistry › Atomic Structure
  2. ²⁰Ne⁺ and ²²Ne⁺ ions are accelerated to the same kinetic energy in a time-of-flight mass spectrometer. Which statement is correct?

    A) ²²Ne⁺ ions reach the detector first because they have more momentum
    B) ²⁰Ne⁺ ions reach the detector first because they travel faster
    C) Both ions arrive together because they have the same charge
    D) ²⁰Ne⁺ ions reach the detector first because they are deflected less
    B) ²⁰Ne⁺ ions reach the detector first because they travel faster

    With equal kinetic energy, the lighter ion has the higher speed, so it crosses the flight tube in less time. Momentum plays no part, and a TOF instrument does not deflect the ions.
    Physical Chemistry › Atomic Structure
  3. Which period 3 element has the highest melting point?

    A) Aluminium
    B) Magnesium
    C) Silicon
    D) Phosphorus
    C) Silicon

    Silicon is macromolecular, so melting breaks many strong covalent bonds. Aluminium has the strongest metallic bonding in the period but still melts far lower.
    Inorganic Chemistry › Periodicity
  4. Why is the atomic radius of chlorine smaller than that of sodium?

    A) Chlorine has fewer shells of electrons than sodium
    B) Chlorine's outer electrons are more strongly shielded than sodium's
    C) Chlorine gains an electron to form a smaller negative ion
    D) Chlorine has a greater nuclear charge with similar shielding
    D) Chlorine has a greater nuclear charge with similar shielding

    Both atoms have their outer electrons in the third shell, so the larger nuclear charge of chlorine pulls them closer. The number of shells is the same.
    Inorganic Chemistry › Periodicity
  5. Which halogenoalkane is hydrolysed fastest by warm aqueous sodium hydroxide?

    A) 1-chlorobutane
    B) 1-bromobutane
    C) 1-iodobutane
    D) 1-fluorobutane
    C) 1-iodobutane

    The C–I bond has the lowest bond enthalpy, so it breaks most easily. The C–F bond is the most polar but also the strongest, so fluoroalkanes react slowest.
    Organic Chemistry › Halogenoalkanes
  6. 2-bromopropane is heated with potassium hydroxide dissolved in ethanol. What is the main organic product?

    A) Propan-2-ol
    B) Propene
    C) Propan-1-ol
    D) Propane
    B) Propene

    In hot ethanolic conditions hydroxide acts mainly as a base, eliminating HBr. Propan-2-ol is the substitution product, favoured by warm aqueous conditions.
    Organic Chemistry › Halogenoalkanes

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More AQA A-level Chemistry decks

Physical Chemistry 1Physical Chemistry 2Inorganic ChemistryOrganic Chemistry 1Organic Chemistry 2Required Practicals

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About these cards

Review status: Second-reader reviewed, with corrections applied.

Checked against:

  • Topic outline follows the AQA AS and A-level Chemistry (7404/7405) specification, version 1.2 (July 2026) (outline only; no specification text reproduced).
  • OpenStax Chemistry 2e and OpenStax Organic Chemistry: A Tenth Edition, consulted as references; no text copied.
  • Also checked against the AQA Chemistry data booklet (June 2025), the AQA AS and A-level Chemistry practical handbook, version 2.2 (February 2025), PubChem compound records, CIAAW atomic weights and CODATA 2022 (reference only; no text copied).

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