Singapore GCE N(A)-Level Science (Chemistry, Biology) Practice Questions - Singapore-Cambridge GCE Normal (Academic) Level Science (Chemistry, Biology) Exam

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A sample of benzoic acid melts over a range of 115 °C to 121 °C. The literature melting point of pure benzoic acid is 122 °C. What does this temperature range indicate about the sample?

The sample is completely pure. The sample is impure because impurities lower and broaden the melting point range. The sample contains water which raises its melting point. The thermometer used was calibrated incorrectly to read lower.

Correct Answer:

The sample is impure because impurities lower and broaden the melting point range.

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