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AQA GCSE Chemistry — Practice Questions flashcards

6 of 70 questions free to study here · 11 topics · the whole deck is built into Willys

Multiple-choice practice questions, one best answer each, across all ten AQA GCSE Chemistry topics and the required practicals. Higher Tier and Chemistry-only questions are marked.

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Practice deck · part of AQA GCSE Chemistry · written against: AQA GCSE Chemistry (8462) specification, version 1.2, 16 January 2026; Higher Tier and separate-science-only cards marked on the front. Updated 2026-10-10.

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6 questions from the deck as they are. Flip, rate yourself, filter by topic; your progress stays in this browser.

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  1. A particle has 20 protons, 20 neutrons and 18 electrons. Which particle is it?

    A) K⁺
    B) S²⁻
    C) Ar
    D) Ca²⁺
    D) Ca²⁺

    Twenty protons make it calcium, and two fewer electrons than protons give a 2+ charge. Argon has 18 electrons but only 18 protons.
    Atomic Structure and the Periodic Table
  2. What is the relative formula mass of magnesium nitrate, Mg(NO₃)₂? (Mg = 24, N = 14, O = 16)

    A) 86
    B) 148
    C) 100
    D) 172
    B) 148

    24 + 2 × (14 + 3 × 16) = 24 + 124 = 148. 86 forgets that the subscript 2 doubles the whole nitrate group.
    Quantitative Chemistry
  3. During a reaction the temperature of the solution falls from 22 °C to 15 °C. Which statement is correct?

    A) The reaction is exothermic and releases energy to the surroundings
    B) The reaction is endothermic and takes in energy from the surroundings
    C) The reaction is endothermic and releases energy to the surroundings
    D) The reaction is exothermic and takes in energy from the surroundings
    B) The reaction is endothermic and takes in energy from the surroundings

    A temperature fall shows that energy has been taken in from the surroundings, which defines an endothermic reaction. Exothermic reactions make the surroundings warmer.
    Energy Changes
  4. Which of these is the formula of an alkane?

    A) C₅H₁₂
    B) C₅H₁₁OH
    C) C₅H₁₀
    D) C₅H₈
    A) C₅H₁₂

    Alkanes follow CₙH₂ₙ₊₂, and 2 × 5 + 2 = 12. C₅H₁₀ fits CₙH₂ₙ, the alkenes.
    Organic Chemistry
  5. According to one widely accepted theory, which gas made up most of the Earth's early atmosphere?

    A) Nitrogen
    B) Oxygen
    C) Carbon dioxide
    D) Methane
    C) Carbon dioxide

    Volcanic activity left an atmosphere mostly of carbon dioxide, as on Mars and Venus today, while most of the water vapour it released condensed into oceans. Nitrogen built up gradually and is the main gas now, not then.
    Chemistry of the Atmosphere
  6. Which method makes a pure, dry sample of copper sulfate crystals from copper oxide?

    A) Add copper oxide to hydrochloric acid, filter, then crystallise
    B) Add excess sulfuric acid to copper oxide, then evaporate to dryness
    C) Stir copper oxide with water, then filter off the solution
    D) Add excess copper oxide to warm sulfuric acid, filter, then crystallise
    D) Add excess copper oxide to warm sulfuric acid, filter, then crystallise

    Excess oxide uses up all the acid and is removed by filtering, and slow crystallisation gives pure crystals. Hydrochloric acid would make copper chloride, not copper sulfate.
    Required Practicals

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More AQA GCSE Chemistry decks

Atomic Structure and BondingQuantitative and Chemical ChangesEnergy, Rates and EquilibriumOrganic Chemistry and AnalysisAtmosphere and ResourcesRequired Practicals

← All AQA GCSE Chemistry decks, with the study guide and topic outline.

About these cards

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

Checked against:

  • Topic outline follows the AQA GCSE Chemistry (8462) specification, version 1.2 (16 January 2026) (outline only; no specification text reproduced).
  • OpenStax Chemistry 2e, consulted as a reference; no text copied.
  • Checked against US Geological Survey Open-File Report 97-262, Impacts of Volcanic Gases on Climate, the Environment, and People (1997) (public domain) (reference only).
  • Also checked against the AQA GCSE Chemistry (8462) required practical handbook, version 5.4 (April 2025), PubChem compound records and CIAAW standard atomic weights (reference only; no text copied).

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