Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
H
GCSE
COMBINED SCIENCE: TRILOGY
Higher Tier
Chemistry Paper 2H
Friday 13 June 2025 Morning Time allowed: 1 hour 15 minutes
Materials For Examiner’s Use
For this paper you must have:
Question Mark
• a ruler
• a scientific calculator 1
• the periodic table (enclosed). 2
3
Instructions
• 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.
• If you need extra space for your answer(s), use the lined pages at the end of TOTAL
this book. Write the question number against your answer(s).
• Do all rough work in this book. Cross through any work you do not want to be
marked.
• In all calculations, show clearly how you work out your answer.
Information
• The maximum mark for this paper is 70.
• The marks for questions are shown in brackets.
• You are expected to use a calculator where appropriate.
• You are reminded of the need for good English and clear presentation in your answers.
*JUN258464C2H01*
IB/M/Jun25/G4007/E7 8464/C/2H
, 2
Do not write
outside the
0 1 Dodecane is an alkane. box
0 1 . 1 The general formula for alkanes is CnH2n+2
A molecule of dodecane has 12 carbon atoms.
Complete the formula of dodecane.
[1 mark]
C H
A student investigated the effect of changing the temperature on the
viscosity of dodecane.
Figure 1 shows the apparatus.
Figure 1
*02*
IB/M/Jun25/8464/C/2H
, 3
Do not write
outside the
This is the method used. box
1. Add 100 cm3 of dodecane at 25 °C to the cup.
2. Immediately start a timer.
3. Stop the timer when 40 cm3 of dodecane has been collected in the
measuring cylinder.
4. Record the time taken.
5. Repeat steps 1 to 4 using dodecane at different temperatures.
0 1 . 2 The student used a water bath to heat the dodecane.
Suggest one reason why the student used a water bath instead of a Bunsen burner to
heat the dodecane.
[1 mark]
0 1 . 3 Give one control variable used in the investigation.
[1 mark]
Question 1 continues on the next page
Turn over ►
*03*
IB/M/Jun25/8464/C/2H
, 4
Do not write
outside the
Figure 2 shows the results. box
Figure 2
0 1 . 4 Predict the time taken to collect 40 cm3 of dodecane at 75 °C.
You should extend the line of best fit on Figure 2.
[2 marks]
Time taken = s
*04*
IB/M/Jun25/8464/C/2H
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
H
GCSE
COMBINED SCIENCE: TRILOGY
Higher Tier
Chemistry Paper 2H
Friday 13 June 2025 Morning Time allowed: 1 hour 15 minutes
Materials For Examiner’s Use
For this paper you must have:
Question Mark
• a ruler
• a scientific calculator 1
• the periodic table (enclosed). 2
3
Instructions
• 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.
• If you need extra space for your answer(s), use the lined pages at the end of TOTAL
this book. Write the question number against your answer(s).
• Do all rough work in this book. Cross through any work you do not want to be
marked.
• In all calculations, show clearly how you work out your answer.
Information
• The maximum mark for this paper is 70.
• The marks for questions are shown in brackets.
• You are expected to use a calculator where appropriate.
• You are reminded of the need for good English and clear presentation in your answers.
*JUN258464C2H01*
IB/M/Jun25/G4007/E7 8464/C/2H
, 2
Do not write
outside the
0 1 Dodecane is an alkane. box
0 1 . 1 The general formula for alkanes is CnH2n+2
A molecule of dodecane has 12 carbon atoms.
Complete the formula of dodecane.
[1 mark]
C H
A student investigated the effect of changing the temperature on the
viscosity of dodecane.
Figure 1 shows the apparatus.
Figure 1
*02*
IB/M/Jun25/8464/C/2H
, 3
Do not write
outside the
This is the method used. box
1. Add 100 cm3 of dodecane at 25 °C to the cup.
2. Immediately start a timer.
3. Stop the timer when 40 cm3 of dodecane has been collected in the
measuring cylinder.
4. Record the time taken.
5. Repeat steps 1 to 4 using dodecane at different temperatures.
0 1 . 2 The student used a water bath to heat the dodecane.
Suggest one reason why the student used a water bath instead of a Bunsen burner to
heat the dodecane.
[1 mark]
0 1 . 3 Give one control variable used in the investigation.
[1 mark]
Question 1 continues on the next page
Turn over ►
*03*
IB/M/Jun25/8464/C/2H
, 4
Do not write
outside the
Figure 2 shows the results. box
Figure 2
0 1 . 4 Predict the time taken to collect 40 cm3 of dodecane at 75 °C.
You should extend the line of best fit on Figure 2.
[2 marks]
Time taken = s
*04*
IB/M/Jun25/8464/C/2H
