Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
F
GCSE
COMBINED SCIENCE: TRILOGY
Foundation Tier
Chemistry Paper 1F
Monday 19 May 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.
7
• If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s). TOTAL
• 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.
*JUN258464C1F01*
IB/M/Jun25/G4007/E9 8464/C/1F
, 2
Do not write
outside the
0 1 This question is about atoms and ions. box
The model of the atom has changed over time.
0 1 . 1 In an early model, scientists thought the atom was a tiny sphere that
could not be divided.
Figure 1 represents this early model of the atom.
Figure 1
The discovery of a subatomic particle led to a change in the model in Figure 1.
Which was the first subatomic particle to be discovered?
[1 mark]
Tick () one box.
Electron
Neutron
Proton
*02*
IB/M/Jun25/8464/C/1F
, 3
Do not write
outside the
0 1 . 2 In a later model of the atom, most of the mass was concentrated in the box
centre of the atom.
What is the name of the centre of an atom?
[1 mark]
0 1 . 3 Atoms contain three types of subatomic particle.
Draw one line from each subatomic particle to the relative charge of the particle.
[2 marks]
0 1 . 4 What is meant by the ‘atomic number of an atom’?
[1 mark]
Tick () one box.
The number of neutrons only
The number of protons only
The number of neutrons + the number of protons
Question 1 continues on the next page
Turn over ►
*03*
IB/M/Jun25/8464/C/1F
, 4
Do not write
outside the
0 1 . 5 Table 1 shows information about two isotopes of an element. box
Table 1
Percentage (%)
Mass number
abundance
Isotope A 10 19.7
Isotope B 11 80.3
Calculate the relative atomic mass (Ar) of the element.
Use the equation:
(mass number × percentage) of isotope A + (mass number × percentage) of isotope B
Ar =
100
Give your answer to 1 decimal place.
[3 marks]
Ar (1 decimal place) =
*04*
IB/M/Jun25/8464/C/1F
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
F
GCSE
COMBINED SCIENCE: TRILOGY
Foundation Tier
Chemistry Paper 1F
Monday 19 May 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.
7
• If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s). TOTAL
• 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.
*JUN258464C1F01*
IB/M/Jun25/G4007/E9 8464/C/1F
, 2
Do not write
outside the
0 1 This question is about atoms and ions. box
The model of the atom has changed over time.
0 1 . 1 In an early model, scientists thought the atom was a tiny sphere that
could not be divided.
Figure 1 represents this early model of the atom.
Figure 1
The discovery of a subatomic particle led to a change in the model in Figure 1.
Which was the first subatomic particle to be discovered?
[1 mark]
Tick () one box.
Electron
Neutron
Proton
*02*
IB/M/Jun25/8464/C/1F
, 3
Do not write
outside the
0 1 . 2 In a later model of the atom, most of the mass was concentrated in the box
centre of the atom.
What is the name of the centre of an atom?
[1 mark]
0 1 . 3 Atoms contain three types of subatomic particle.
Draw one line from each subatomic particle to the relative charge of the particle.
[2 marks]
0 1 . 4 What is meant by the ‘atomic number of an atom’?
[1 mark]
Tick () one box.
The number of neutrons only
The number of protons only
The number of neutrons + the number of protons
Question 1 continues on the next page
Turn over ►
*03*
IB/M/Jun25/8464/C/1F
, 4
Do not write
outside the
0 1 . 5 Table 1 shows information about two isotopes of an element. box
Table 1
Percentage (%)
Mass number
abundance
Isotope A 10 19.7
Isotope B 11 80.3
Calculate the relative atomic mass (Ar) of the element.
Use the equation:
(mass number × percentage) of isotope A + (mass number × percentage) of isotope B
Ar =
100
Give your answer to 1 decimal place.
[3 marks]
Ar (1 decimal place) =
*04*
IB/M/Jun25/8464/C/1F
