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2.6 Calculations involving masses

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Question 22
F

A student heats magnesium in a crucible to determine the empirical formula of magnesium oxide. Which procedure gives the most reliable evidence that the reaction is complete?

[1]
A

Heat once, then weigh the crucible while it is still hot

B

Heat for a long time once, then weigh after cooling

C

Heat with the lid kept tightly closed throughout

D

Heat, cool and weigh repeatedly until the mass is constant

Markscheme

2.6 Calculations involving masses Questions

  1. GCSE
  2. /Chemistry
  3. /2.6 Calculations involving masses

55 exam-style questions on Edexcel GCSE Chemistry 2.6 Calculations involving masses, covering 2.6.1 Relative formula mass and percentage composition, 2.6.2 Empirical and molecular formulae, 2.6.3 Conservation of mass, 2.6.4 Reacting masses and concentration in g dm⁻³, 2.6.5 The mole and the Avogadro constant, and 2.6.6 Limiting reactants and stoichiometry. Each one has a worked solution and a mark scheme showing where the marks go.

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