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1.1 Formulae, equations and hazards

1.1 Formulae, equations and hazards

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Question 78

Calcium carbonate decomposes upon heating to produce solid calcium oxide and carbon dioxide gas.

CaCO3(s)→CaO(s)+CO2(g) \text{CaCO}_3(\text{s}) \rightarrow \text{CaO}(\text{s}) + \text{CO}_2(\text{g}) CaCO3​(s)→CaO(s)+CO2​(g)

A student strongly heated 18.425 g of pure calcium carbonate in an open crucible. Once the reaction was complete, the remaining solid residue was allowed to cool and found to have a mass of 10.310 g.

Calculate the mass of carbon dioxide gas released during this thermal decomposition.

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Markscheme

1.1 Formulae, equations and hazards Questions

  1. GCSE
  2. /Chemistry
  3. /1.1 Formulae, equations and hazards

230 exam-style questions on Edexcel GCSE Chemistry 1.1 Formulae, equations and hazards, covering 1.1.1 Formulae, word and balanced equations, 1.1.2 Balanced ionic equations, and 1.1.3 Hazard symbols and risk in practical work. Each one has a worked solution and a mark scheme showing where the marks go.

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