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8.1 Purity, formulations and chromatography

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Question 23

A research group measures the melting and boiling behaviour of four samples produced during an investigation.

SampleMelting resultBoiling result
K66 ∘C66\ ^\circ\text{C}66 ∘C178 to 184 ∘C184\ ^\circ\text{C}184 ∘C
L91 to 98 ∘C98\ ^\circ\text{C}98 ∘C226 ∘C226\ ^\circ\text{C}226 ∘C
M74 ∘C74\ ^\circ\text{C}74 ∘C198 ∘C198\ ^\circ\text{C}198 ∘C
N108 to 114 ∘C114\ ^\circ\text{C}114 ∘C252 to 260 ∘C260\ ^\circ\text{C}260 ∘C

What do these results show?

[1]
A

Sample L is the only pure substance.

B

Sample K is the only pure substance.

C

Sample N is the only pure substance.

D

Sample M is the only pure substance.

Markscheme

8.1 Purity, formulations and chromatography Questions

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

113 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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