worked solutions
model answers
, Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
GCSE
CHEMISTRY
Higher Tier Paper 2
H
Friday 13 June 2025 Morning Time allowed: 1 hour 45 minutes
Materials For Examiner’s Use
For this paper you must have:
• a ruler Question Mark
• a scientific calculator 1
• the periodic table (enclosed).
2
Instructions 3
• Use black ink or black ball-point pen. 4
• Pencil should only be used for drawing. 5
• Fill in the boxes at the top of this page.
6
• Answer all questions in the spaces provided. Do not write outside
the box around each page or on blank pages. 7
• If you need extra space for your answer(s), use the lined pages at the end of 8
this book. Write the question number against your answer(s).
9
• Do all rough work in this book. Cross through any work you do not want
to be marked. TOTAL
Information
• The maximum mark for this paper is 100.
• The marks for questions are shown in brackets.
• You are expected to use a calculator where appropriate.
• In all calculations, show clearly how you work out your answer.
• You are reminded of the need for good English and clear presentation
in your answers.
IB/G/Jun25/G4007/E10 8462/2H
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, 2
Do not write
outside the
0 1 A student investigated the mass of dissolved solids in sea water. box
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]
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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
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IB/G/Jun25/8462/2H
model answers
, Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
GCSE
CHEMISTRY
Higher Tier Paper 2
H
Friday 13 June 2025 Morning Time allowed: 1 hour 45 minutes
Materials For Examiner’s Use
For this paper you must have:
• a ruler Question Mark
• a scientific calculator 1
• the periodic table (enclosed).
2
Instructions 3
• Use black ink or black ball-point pen. 4
• Pencil should only be used for drawing. 5
• Fill in the boxes at the top of this page.
6
• Answer all questions in the spaces provided. Do not write outside
the box around each page or on blank pages. 7
• If you need extra space for your answer(s), use the lined pages at the end of 8
this book. Write the question number against your answer(s).
9
• Do all rough work in this book. Cross through any work you do not want
to be marked. TOTAL
Information
• The maximum mark for this paper is 100.
• The marks for questions are shown in brackets.
• You are expected to use a calculator where appropriate.
• In all calculations, show clearly how you work out your answer.
• You are reminded of the need for good English and clear presentation
in your answers.
IB/G/Jun25/G4007/E10 8462/2H
for more: tyrionpapers.com
, 2
Do not write
outside the
0 1 A student investigated the mass of dissolved solids in sea water. box
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]
for more: tyrionpapers.com
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 ►
for more: tyrionpapers.com
IB/G/Jun25/8462/2H
