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6.3 Interpreting and interacting with earth systems

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Question 18

Sea creatures use dissolved carbon dioxide to make shells containing calcium carbonate. During processing, a batch of discarded shells is heated strongly until all the calcium carbonate has decomposed. The process releases 66 kg of carbon dioxide.

CaCO3→CaO+CO2 \mathrm{CaCO_{3} \rightarrow CaO + CO_{2}} CaCO3​→CaO+CO2​

Relative atomic mass (ArA_rAr​): C = 12 O = 16 Ca = 40

What mass of calcium carbonate was present in the batch?

[1]
A

66 kg

B

29 kg

C

150 kg

D

84 kg

Markscheme

6.3 Interpreting and interacting with earth systems Questions

  1. GCSE
  2. /Chemistry
  3. /6.3 Interpreting and interacting with earth systems

109 exam-style questions on OCR GCSE Chemistry 6.3 Interpreting and interacting with earth systems, covering 6.3.1 Formation and evolution of the atmosphere, 6.3.2 The greenhouse effect and climate change, 6.3.3 Sources and problems of atmospheric pollutants, and 6.3.4 Producing potable water. Each one has a worked solution and a mark scheme showing where the marks go.

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