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Chemistry Specimen Paper C1B ­ Nov 2010

Mark Scheme (updated November 2010)



Qs Answer Accept/Reject Mk
s
1a CaCO3 -> CaO + CO2 CaOH2 ­ no 6
CaO + H2O -> Ca(OH)2 brackets -1 for
Ca(OH)2 + CO2 -> CaCO3 + H2O each time used
CaCO3 = CaO +
CO2…

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to wrong
equation, this
does not
account.
Wrong
equation or
symbol, e.g.
FeO and not
Fe2O3, take
away one mark.
1e Alloy: metals that contains other Mixup of 2
elements, usually for more desired definitions
properties means NO
Ore: enough metal or metal compound marks.
in a rock to make…

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used in nuclear reactors and at
high temperatures

2a Cracking: breaking a molecule apart One mark per 4
using heat. correct
Distillation: evaporation, and definition.
condensation in succession to purify Examples
liquids account for no
Refining: removing impurities marks.
Unsaturated Hydrocarbon: hydrocarbon,
which contains a double carbon-carbon
bond.
2b Unsaturated…

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Example = 1
mark.
3d Emulsifier: a substance that stops oil Example 2
and water from separating out into accounts for
layers. mark if shown.
Student can
still gain full
marks without
example
however.
3e Salad cream is thicker than water. Allow any 2
Salad cream is heavier than oil.…

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4b Tectonic movement is caused by Explanation is 5
convection currents that push tectonic worth just 1
plates over the surface of the Earth. MARK!
Pencil drawn
diagram = 1
mark.
Convection
currents shown
= 1 marks.
2 convection
currents shown
at least = 1
mark
Correct
annotation = 1…

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Carbon sinks:
Oceans
Fossil fuels locked away ­ BUT
now we're releasing this lock
back into the atmosphere
Forests ­ nature ­ plants for
photosynthesis
Rocks absorb CO2

21 Pass mark = 53/74 72% B 74
Qs
30/74 41% D
47/74 64% C
53/74 72% B
60/74 81% A
69/74…

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