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2.1 Purity and separating mixtures

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Question 7
F

Aluminium hydroxide decomposes when it is heated.

2Al(OH)3→Al2O3+3H2O \mathrm{2Al(OH)_{3} \rightarrow Al_{2}O_{3} + 3H_{2}O} 2Al(OH)3​→Al2​O3​+3H2​O

Relative atomic mass (ArA_{r}Ar​): H = 1.0 O = 16.0 Al = 27.0

Which row shows the total relative formula mass of the reactants and the total relative formula mass of the products, as shown in the balanced equation?

[1]
A

Reactants: 78; Products: 120

B

Reactants: 156; Products: 156

C

Reactants: 78; Products: 156

D

Reactants: 156; Products: 120

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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