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2.1 Purity and separating mixtures

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Question 27

A manufacturer uses a treatment to purify solid substance R. Pure R has a data book melting point of 126 ∘C126\,^\circ\mathrm{C}126∘C.

The melting ranges are measured at the same pressure.

Sample testedMelting range (∘C^\circ\mathrm{C}∘C)
Before the treatment117 to 123
After the treatment124 to 125

The manufacturer claims that the treatment was completely successful and produced pure R.

Evaluate the manufacturer's claim. Use the data in your answer.

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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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