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2.1 Purity and separating mixtures

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Question 4
F

A student heats four solid samples, W, X, Y and Z, and records the temperatures at which each sample melts.

SampleMelting temperature (∘C^\circ\mathrm{C}∘C)
W78 to 83
X69 to 80
Y81
Z74 to 79

Which sample is most likely to be a pure substance?

[1]
A

Sample W

B

Sample X

C

Sample Y

D

Sample Z

Markscheme

2.1 Purity and separating mixtures Questions

  1. GCSE
  2. /Chemistry
  3. /2.1 Purity and separating mixtures

51 exam-style questions on OCR GCSE Chemistry 2.1 Purity and separating mixtures, covering 2.1.1 Pure substances and melting point data, 2.1.2 Relative formula mass and empirical formula, 2.1.3 Formulations as useful mixtures, 2.1.4 Techniques for separating mixtures, and 2.1.5 Chromatography and Rf values. Each one has a worked solution and a mark scheme showing where the marks go.

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