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2.1 Purity and separating mixtures

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Question 3

A chemist builds a model of a molecule containing 4 carbon atoms, 8 hydrogen atoms and 4 oxygen atoms.

What is the empirical formula represented by the model?

[1]
A

C2H4O2\mathrm{C_{2}H_{4}O_{2}}C2​H4​O2​

B

CHO\mathrm{CHO}CHO

C

CH2O\mathrm{CH_{2}O}CH2​O

D

C4H8O4\mathrm{C_{4}H_{8}O_{4}}C4​H8​O4​

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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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