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A-Level Chemistry, Specimen Paper question and answers update 2025
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7
April 2025
2024/2025
A+
A-Level Chemistry, Specimen Paper question and answers update 2025
Describe how the student could use chemical tests to confirm that the liquid contained ethanal and did not contain ethanoic acid. - ANSWERReagent to confirm the presence of ethanal:
Add Tollens' reagent
OR
Add Fehling's solution;
Warm;
Result with Tollen's reagent: Silver mirror
OR
Result with Fehling's solution: Red precipitate;
Reagent to confirm the absence of ethanoic acid:
Add sodium hydrogenc...
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