AQA · Chemistry · 8462
GCSE Chemistry: Reactions of acids with metals
Chemical changes · AQA GCSE Chemistry (8462), specification point 4.4.2.1. Cards are generated from the exam board's own specification for "Reactions of acids with metals", and every card links back to the page it came from. Specification © AQA — used with attribution.
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What two products form when an acid reacts with a metal?
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A salt and hydrogen gas.
Acids react with some metals to produce salts and ?.
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hydrogen
Write the balanced symbol equation for magnesium reacting with hydrochloric acid.
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Mg + 2HCl → MgCl₂ + H₂
What salt is formed when zinc reacts with sulfuric acid?
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Zinc sulfate (ZnSO₄), with hydrogen gas also released.
What salt is formed when iron reacts with hydrochloric acid?
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Iron(II) chloride (FeCl₂), with hydrogen gas also released.
Define oxidation in terms of electrons.
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Loss of electrons.
Define reduction in terms of electrons.
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Gain of electrons.
Why is the reaction of a metal with an acid a redox reaction?
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Electrons are transferred: the metal atoms lose electrons (oxidised) while hydrogen ions gain electrons (reduced) — both happen in the same reaction.
In Mg + 2H⁺ → Mg²⁺ + H₂, which species is oxidised?
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Magnesium — each Mg atom loses two electrons to become Mg²⁺.
In Zn + 2H⁺ → Zn²⁺ + H₂, which species is reduced?
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The hydrogen ions (H⁺) — they gain electrons to form hydrogen molecules (H₂).
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