End of Year Test
Year 8 Chemistry Mark Scheme
Question Part Step Answer Mark scheme
1 a 5th a substance that contains hydrogen and 2 marks – 1 for each
5th carbon point
only
b 6th carbon dioxide 2 marks – 1 for each
6th water point
[Allow in either order.]
c 5th C carbon monoxide 1 mark
2 a 5th Any one from: 1 mark
● bright, white flame
● white ash left
b 5th C oxidation 1 mark
c 6th 0.8 g (of oxygen) 2 marks – 1 for each
6th the total mass before and after is the point
same/mass of magnesium oxide – mass of
magnesium
3 ai 7th transfers energy, so the temperature of the 1 mark
surroundings increases
aii 5th fuel, heat and oxygen 1 mark – All three
needed for the mark
aiii 3rd C oxidising 1 mark
bi 5th the fuel used/ethanol and propanol 1 mark
bii 5th the temperature rise (of the water) 1 mark
biii 4th Any two from: 2 marks – 1 for each
4th ● volume or mass of water and use the point
same volume or mass of water
● height of the calorimeter/beaker above
the flame, and use the same height
● size of flame, and use the same size of
flame
[Do not allow same mass of fuel/ethanol and
propanol.]
[Do not allow same time, because that is
given in the question.]
4 a 5th Any one from: 1 mark
● burning any type of fuel that releases
carbon dioxide
● deforestation
● livestock farming
● respiration
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End of Year Test
Year 8 Chemistry Mark Scheme
Question Part Step Answer Mark scheme
b 5th Any one from: 1 mark
● climate change
● more storms
● more floods
● more droughts
● rising sea levels
● melting glaciers/ice caps
● global warming
● increase in greenhouse effect
5 ai 5th a small particle from which all substances are 1 mark
made
aii 5th a single substance made up of only one type 1 mark
of atom/a substance that cannot be broken
down any further
aiii 5th a substance that can be split up into simpler 1 mark
substances/a substance that contains two or
more elements chemically joined together
bi 6th D copper 1 mark
bii 6th D potassium 1 mark
ci 7th C2H6 1 mark
[Allow H6C2]
cii 7th 3g 1 mark
di 6th A alkali metals 1 mark
dii 6th lithium hydroxide 2 marks – 1 for each
6th hydrogen point
[Allow in either order.]
6 a 6th liquid 1 mark
b 6th 52 °C ± 2 (as there is no grid on the graph) 1 mark
c 7th the extra energy supplied by heating is used 2 marks – 1 for each
7th to overcome the forces between the particles point
so particles escape from the liquid
7 a 6th a substance that speeds up/increases the 2 marks – 1 for each
6th rate of a reaction point
but is not used up/the mass stays the same
bi 6th oxygen 2 marks – 1 for each
6th water point
[Allow in either order.]
bii 6th 2:3 1 mark
[Allow 1 : 1.5]
c 5th B copper 1 mark
di 5th effervescence/fizzing/stream of bubbles 2 marks – 1 for each
5th magnesium disappears/dissolves; colourless point
solution left
[Do not allow gas/hydrogen given off.]
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End of Year Test
Year 8 Chemistry Mark Scheme
Question Part Step Answer Mark scheme
dii 9th Mg + H2SO4 → MgSO4 + H2 2 marks – 1 mark for
9th LHS, 1 mark for RHS
8 a 4th B student 3; student 5 1 mark
b 4th temperature rise: 5 °C/student 4 1 mark
c 6th Any one from: 1 mark
● the magnesium ribbon was shorter than
3 cm
● the reaction was not finished or the
student did not wait long enough before
measuring the final temperature
[Do not allow the volume of acid was less
than 20 cm3.]
9 7th the atoms/particles are all the same size in 4 marks – 1 for each
8th the pure metal point
7th so the layers of atoms can slide over each
other (when a force is applied)
8th
the atoms/particles are different sizes in an
alloy
and this disrupts the structure/prevents the
layers from sliding over each other
10 a 7th smaller crystals are formed when the magma 2 marks – 1 for each
7th cools quickly/larger crystals are formed when point
the magma cools slowly
there is less time for the crystals to form when
the magma cools quickly/there is more time
for the crystals to form when the magma
cools slowly
b 5th heat 2 marks – 1 for each
5th pressure point
c 5th water gets into cracks 2 marks – 1 for each
5th it expands when it freezes (forcing the crack point
to get bigger)
d 6th dead plants or animals fall to the sea bed 2 marks – 1 for each
6th covered with layers of sediment point
e 5th metamorphic 1 mark
f 5th Any two from: 2 marks – 1 for each
5th ● less damage to the environment from point
mining/quarrying
● reduces pollution from mining or quarrying
● reduces amount sent to landfill
● allows supplies of metal (ores) to last
longer
● uses less energy than extracting the
metal from its ore
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End of Year Test
Year 8 Chemistry Mark Scheme
Final Step Calculation
Marks Step
1–5 Below 3rd
6–11 3rd
12–21 4th
22–32 5th
33–42 6th
43–50 7th
51–55 8th
56–60 9th
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