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2.6 Calculations involving masses

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Question 51

A student heats a piece of magnesium ribbon strongly in an open crucible. The magnesium reacts to form magnesium oxide.

The mass of the crucible and its contents at the end is greater than the mass at the start.

Explain why this increase in mass does not mean that mass has been created in the reaction.

[2]
Markscheme

2.6 Calculations involving masses Questions

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

142 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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