Transcript PPT C1 1.2.1

C1.2.1 Calcium Carbonate
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Foundation Tier C1 June 12, 4
1.
• a (i)
(ii)
• b
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1b continued
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Mark scheme
Q
Answer
Extra Information
Mark
1 (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
1b
Advantage- quarrying limestone
provides building materials,
employment and new road links
Disadvantage- quarrying limestone
releases dust, and lorries release
carbon dioxide from burning fossil fuel
1
1
Total
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4
Higher Tier C1 June 12, 5
1
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Mark scheme- Higher tier
Q
Answer
Extra Information
Mark
1 (a) (i)
Water
Accept hydrogen oxide
Allow H2O
1
1 (a) (ii)
Carbon dioxide
Allow CO2
1
Accept any soluble carbonate or
carbonic acid
1 b (i)
1 b (ii)
1 c (i)
CaCO3 + 2 HCl
CO2 + H2O
1
CaCl2 +
Because sulfur reacts with oxygen/air
to produce sulfur dioxide or sulfur
burns to produce sulfur dioxide
And (sulfur dioxide) causes acid rain
that reacts with/erodes
limestone/calcium carbonate
Accept correct equation
1
Ignore wears away
1
Because carbon dioxide is produced
from burning methane
Accept correct equation
1
Because carbon dioxide is produced
from decomposing calcium
carbonate/limestone
Accept correct equation
Do not accept carbon in calcium
carbonate reacting with air
1
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Mark scheme- Higher continued
Q
Answer
Extra Information
Mark
1 c (i)
Because carbon dioxide is produced
from burning methane
Accept correct equation
1
Because carbon dioxide is produced
from decomposing calcium
carbonate/limestone
Accept correct equation
Do not accept carbon in calcium
carbonate reacting with air
1
Nitrogen
This is the main gas/75-80%/of air
Allow there is a lot of this gas in
air
1
1
Total
9
1 c (ii)
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