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2.1 Purity and separating mixtures

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Question 10

Pure substance L melts sharply at 82 ∘C82\, ^\circ\mathrm{C}82∘C and pure substance M melts sharply at 106 ∘C106\, ^\circ\mathrm{C}106∘C.

A materials laboratory measures the melting temperatures of two samples and records the labels proposed for them.

SampleMelting temperature or range (∘C^\circ\mathrm{C}∘C)Proposed label
X79 to 81Pure L
Y106Pure M
a.

Evaluate the proposed labels using the data.

[3]
b.

Explain, in terms of particles and the forces between them, why sample X melts over a range of temperatures rather than at one temperature.

[2]
Markscheme

2.1 Purity and separating mixtures Questions

  1. GCSE
  2. /Chemistry
  3. /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.

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