AQA GCSE Chemistry Chemical Changes
Questions and Answers 2026 | Exam Revision
Workbook
Reduction - CORRECT ANSWER -Gain of electrons
Displacement reaction - CORRECT ANSWER -
When a more reactive element takes the place of a less reactive element in a compound
Redox reaction - CORRECT ANSWER -A reaction where both oxidation and reduction occur
Acid - CORRECT ANSWER -Substance that produces hydrogen ions (H⁺) in water
Alkali - CORRECT ANSWER -Substance that produces hydroxide ions (OH⁻) in water
Strong acid - CORRECT ANSWER -An acid which is fully ionised (split into ions) in water
Weak acid - CORRECT ANSWER -An acid in which only a few molecules are ionised
Dilute - CORRECT ANSWER -A solution containing a small amount of dissolved solute
Concentrated - CORRECT ANSWER -A solution containing a lot of dissolved solute
Neutralisation - CORRECT ANSWER -Reaction between an acid and an alkali forming water.
Ionic equation for neutralisation - CORRECT ANSWER -H⁺(aq) + OH⁻(aq) → H₂O(l)
Acid + Base - CORRECT ANSWER -→ salt + water
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Questions and Answers 2026 | Exam Revision
Workbook
Reduction - CORRECT ANSWER -Gain of electrons
Displacement reaction - CORRECT ANSWER -
When a more reactive element takes the place of a less reactive element in a compound
Redox reaction - CORRECT ANSWER -A reaction where both oxidation and reduction occur
Acid - CORRECT ANSWER -Substance that produces hydrogen ions (H⁺) in water
Alkali - CORRECT ANSWER -Substance that produces hydroxide ions (OH⁻) in water
Strong acid - CORRECT ANSWER -An acid which is fully ionised (split into ions) in water
Weak acid - CORRECT ANSWER -An acid in which only a few molecules are ionised
Dilute - CORRECT ANSWER -A solution containing a small amount of dissolved solute
Concentrated - CORRECT ANSWER -A solution containing a lot of dissolved solute
Neutralisation - CORRECT ANSWER -Reaction between an acid and an alkali forming water.
Ionic equation for neutralisation - CORRECT ANSWER -H⁺(aq) + OH⁻(aq) → H₂O(l)
Acid + Base - CORRECT ANSWER -→ salt + water
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