AQA GCSE Chemistry — Required Practicals flashcards
10 of 69 cards free to study here · 1 topic · the whole deck is built into Willys
The eight AQA GCSE Chemistry required practicals: making salts, titration, electrolysis, temperature changes, rates, chromatography, ion tests and water analysis, with variables, methods, safety, errors and calculations. Higher Tier and Chemistry-only cards are marked.
Learn 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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In the required practical to make copper sulfate crystals, which two reactants are used, and what is the aim?Copper(II) oxide and dilute sulfuric acid, to make a pure, dry sample of the soluble salt copper sulfate.Required Practicals › Making Salts
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Why is the dilute sulfuric acid warmed before the copper oxide is added?Warming increases the rate of reaction, so the copper oxide reacts faster.Required Practicals › Making Salts
Watch out: warm it gently and do not let it boil. -
While copper oxide is added to warm acid, how do you know when to stop adding it?When black solid remains undissolved however long you stir: the oxide is in excess, so all the acid has reacted.Required Practicals › Making Salts
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Why is the mixture filtered after the reaction, and which part is kept?To remove the excess, unreacted copper oxide; the filtrate (the blue copper sulfate solution) is kept.Required Practicals › Making Salts
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Why is the copper sulfate solution evaporated over a water bath or electric heater rather than heated strongly with a Bunsen burner?A water bath heats gently and evenly, so the solution does not spit or overheat.Required Practicals › Making Salts
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Why is the copper sulfate solution not evaporated to dryness?Heating only until crystals start to form, then leaving it to crystallise slowly, gives larger, purer crystals; overheating can drive off the water of crystallisation and leave a white powder.Required Practicals › Making Salts
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How can you tell that the evaporating solution is ready to be left to crystallise?Crystals start to form at the edge, or a drop taken out on a glass rod forms crystals as it cools.Required Practicals › Making Salts
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How are the crystals dried at the end of the salt preparation?Pat them dry between filter papers, or leave them in a warm place to dry.Required Practicals › Making Salts
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Why must the solid added to the acid be insoluble in water in this method?So that the excess can be filtered off, leaving only the salt in solution; an excess of a soluble solid would contaminate the salt.Required Practicals › Making Salts
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Zinc carbonate is used with hydrochloric acid instead. Which salt forms, and what extra observation shows the reaction is happening?Zinc chloride; fizzing as carbon dioxide is given off, which stops when the acid has been used up.Required Practicals › Making Salts
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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.
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