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8.1 Purity, formulations and chromatography

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Question 15
F

A student says: 'My sample melted between 76 ∘C76\ ^\circ\text{C}76 ∘C and 82 ∘C82\ ^\circ\text{C}82 ∘C, so it must be pure.'

Which comment on the student's statement is correct?

[1]
A

The student is right, because the range covers only a few degrees

B

The student is right, because every substance melts over a range

C

The student is wrong, because a mixture melts at a specific temperature

D

The student is wrong, because a pure substance melts at a specific temperature

Markscheme

8.1 Purity, formulations and chromatography Questions

  1. GCSE
  2. /Chemistry
  3. /8.1 Purity, formulations and chromatography

40 exam-style questions on AQA GCSE Chemistry 8.1 Purity, formulations and chromatography, covering 8.1.1 Pure substances, 8.1.2 Formulations, and 8.1.3 Chromatography. Each one has a worked solution and a mark scheme showing where the marks go.

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