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C1.2.1 Calcium Carbonate

Using Exam pro items to support successful outcomes

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• Learners will be able to test their progress against learning outcomes using questions fro past AQA GCSE examinations

Foundation Tier C1 June 12, 41.

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• a (i) (ii)

• b

1b continued

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Mark scheme

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Q Answer Extra Information Mark1 (a) (i) Bubble the gas through

limewater/calcium hydroxide solution

allow (add) limewater. Test must be correct to gain result mark

1

1 (a) (ii) (the solution) goes cloudy Allow milky 1

1 b Advantage- quarrying limestone provides building materials, employment and new road linksDisadvantage- quarrying limestone releases dust, and lorries release carbon dioxide from burning fossil fuel

1

1

Total 4

Higher Tier C1 June 12, 5

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1

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Mark scheme- Higher tier

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Q Answer Extra Information Mark1 (a) (i) Water Accept hydrogen oxide

Allow H2O1

1 (a) (ii) Carbon dioxide Allow CO2

Accept any soluble carbonate or carbonic acid

1

1 b (i) CaCO3 + 2 HCl CaCl2 + CO2 + H2O

1

1 b (ii) Because sulfur reacts with oxygen/air to produce sulfur dioxide or sulfur burns to produce sulfur dioxideAnd (sulfur dioxide) causes acid rain that reacts with/erodes limestone/calcium carbonate

Accept correct equation

Ignore wears away

1

1

1 c (i) Because carbon dioxide is produced from burning methane

Because carbon dioxide is produced from decomposing calcium carbonate/limestone

Accept correct equation

Accept correct equationDo not accept carbon in calcium carbonate reacting with air

1

1

Mark scheme- Higher continued

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Q Answer Extra Information Mark

1 c (i) Because carbon dioxide is produced from burning methane

Because carbon dioxide is produced from decomposing calcium carbonate/limestone

Accept correct equation

Accept correct equationDo not accept carbon in calcium carbonate reacting with air

1

1

1 c (ii) NitrogenThis is the main gas/75-80%/of air

Allow there is a lot of this gas in air

11

Total 9