2025 AQA GCSE CHEMISTRY Higher Tier Paper 2
Question Paper & Mark Scheme (Merged) June
2025 [VERIFIED]
IB/G/Jun25/G4007/E10 8462/2H
, 2
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0 1 A student investigated the mass of dissolved solids in sea water.
This is the method used.
1. Weigh an empty evaporating basin.
2. Measure 10.0 cm3 of sea water sample A into the evaporating basin
using a burette.
3. Heat the evaporating basin until all the water seems to have evaporated.
4. Weigh the evaporating basin and contents.
5. Calculate the mass of dissolved solids in the sample.
6. Repeat steps 1 to 5 with sea water samples B, C and D.
0 1 . 1 Why did the student use a burette rather than a measuring cylinder to measure
10.0 cm3 of each sample?
[1 mark]
0 1 . 2 What was the dependent variable in this investigation?
[1 mark]
0 1 . 3 Describe how the student could make sure all of the water had evaporated in step 3.
[2 marks]
0 1 . 4 How did the student calculate the mass of dissolved solids in each sea water sample?
[1 mark]
IB/G/Jun25/8462/2H
, 3
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Table 1 shows the results. box
Table 1
Sea water sample A B C D
Mass of dissolved solids in grams 0.35 0.37 0.33 0.34
0 1 . 5 Calculate the mean concentration of dissolved solids in 10.0 cm3 samples of
sea water A, B, C and D.
Use Table 1 and the equation:
mean mass of dissolved solids (g)
mean concentration of dissolved solids (g/dm3) =
volume of sample (dm3)
3
Give your answer in g/dm .
[5 marks]
Mean concentration = ________________ g/dm3
0 1 . 6 Suggest why sea water samples A, B, C and D contain different masses
of dissolved solids.
[1 mark]
11
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IB/G/Jun25/8462/2H
, 4
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0 2 This question is about hydrocarbon fuels.
Figure 1 represents the process used to separate hydrocarbon fuels from crude oil.
Figure 1
0 2 . 1 Name the process represented by Figure 1.
[1 mark]
0 2 . 2 Changes of state take place during the process in Figure 1.
Name the change of state taking place in:
the heater
the column.
[2 marks]
Heater
Column
IB/G/Jun25/8462/2H
Question Paper & Mark Scheme (Merged) June
2025 [VERIFIED]
IB/G/Jun25/G4007/E10 8462/2H
, 2
Do not write
outside the
box
0 1 A student investigated the mass of dissolved solids in sea water.
This is the method used.
1. Weigh an empty evaporating basin.
2. Measure 10.0 cm3 of sea water sample A into the evaporating basin
using a burette.
3. Heat the evaporating basin until all the water seems to have evaporated.
4. Weigh the evaporating basin and contents.
5. Calculate the mass of dissolved solids in the sample.
6. Repeat steps 1 to 5 with sea water samples B, C and D.
0 1 . 1 Why did the student use a burette rather than a measuring cylinder to measure
10.0 cm3 of each sample?
[1 mark]
0 1 . 2 What was the dependent variable in this investigation?
[1 mark]
0 1 . 3 Describe how the student could make sure all of the water had evaporated in step 3.
[2 marks]
0 1 . 4 How did the student calculate the mass of dissolved solids in each sea water sample?
[1 mark]
IB/G/Jun25/8462/2H
, 3
Do not write
outside the
Table 1 shows the results. box
Table 1
Sea water sample A B C D
Mass of dissolved solids in grams 0.35 0.37 0.33 0.34
0 1 . 5 Calculate the mean concentration of dissolved solids in 10.0 cm3 samples of
sea water A, B, C and D.
Use Table 1 and the equation:
mean mass of dissolved solids (g)
mean concentration of dissolved solids (g/dm3) =
volume of sample (dm3)
3
Give your answer in g/dm .
[5 marks]
Mean concentration = ________________ g/dm3
0 1 . 6 Suggest why sea water samples A, B, C and D contain different masses
of dissolved solids.
[1 mark]
11
Turn over ►
IB/G/Jun25/8462/2H
, 4
Do not write
outside the
box
0 2 This question is about hydrocarbon fuels.
Figure 1 represents the process used to separate hydrocarbon fuels from crude oil.
Figure 1
0 2 . 1 Name the process represented by Figure 1.
[1 mark]
0 2 . 2 Changes of state take place during the process in Figure 1.
Name the change of state taking place in:
the heater
the column.
[2 marks]
Heater
Column
IB/G/Jun25/8462/2H
