2.1 Purity and separating mixtures

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Question 14

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

Sample	Melting temperature ( $∘C^\circ\mathrm{C}$ )
W	78 to 83
X	69 to 80
Y	81
Z	74 to 79

Which sample is most likely to be a pure substance?

[1]

Sample W

Sample X

Sample Y

Sample Z

Markscheme

2.1 Purity and separating mixtures Questions

GCSE
Chemistry
2.1 Purity and separating mixtures

102 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.

Question bank·2.1 Purity and separating mixtures