Mark Scheme
(Results)
2025 Prediction Paper
Pearson Edexcel GCSE
In Chemistry (1CH0/1F) Paper 1F
, Edexcel Chemistry 1F 2025 Prediction Question Paper
General Marking Guidance
• All candidates must receive the same treatment. Examiners must mark the first
candidate in exactly the same way as they mark the last.
• Mark schemes should be applied positively. Candidates must be rewarded for
what they have shown they can do rather than penalised for omissions.
• Examiners should mark according to the mark scheme not according to their
perception of where the grade boundaries may lie.
• There is no ceiling on achievement. All marks on the mark scheme should be used
appropriately.
• All the marks on the mark scheme are designed to be awarded. Examiners
should always award full marks if deserved, i.e. if the answer matches the
mark scheme. Examiners should also be prepared to award zero marks if the
candidate’s response is not worthy of credit according to the mark scheme.
• Where some judgement is required, mark schemes will provide the principles by
which marks will be awarded and exemplification may be limited.
• When examiners are in doubt regarding the application of the mark scheme
to a candidate’s response, the team leader must be consulted.
• Crossed out work should be marked UNLESS the candidate has replaced it
with an alternative response.
, Edexcel Chemistry 1F 2025 Prediction Question Paper
Find the comprehensive elaborations for the question set provided
beneath the mark scheme for Question 01.
Question 1
Question Answers Extra information Mark
(i) Drawing particle
(i): 3
01.a arrangement in solid wax:
Particles in a solid are tightly
● Particles drawn closely packed in a regular, fixed
packed in a regular arrangement. They cannot
arrangement. (1 mark) move but can only vibrate in
place due to strong
(ii) Difference between
intermolecular forces.
particles in liquid and solid
wax:
(ii):
● Particles in liquid are less Particles in a liquid are less
tightly packed and can organized, can move past each
move past each other, other, and are further apart
unlike the fixed positions compared to solids, allowing
in solids. (1 mark) liquids to flow.
(iii) Explanation of particle
(iii):
movement in gases:
In gases, particles are far apart,
● Particles in a gas move move freely and rapidly in
faster because they have random directions because they
more kinetic energy have maximum kinetic energy.
compared to liquids. (1
mark)
Question Answers Extra information Mark
01.b (i) Name of the process (i): 2
when wax changes from Freezing involves the
liquid to solid: formation of a solid from a
● Correct answer: liquid as thermal energy is
Freezing. (1 mark) lost, reducing particle motion.
(ii) Explanation of why this (ii):
is a physical change: Physical changes do not alter
● The change is physical the substance's chemical
because no new identity; only the state
substance is formed; changes, e.g., wax remains
the wax retains its chemically unchanged when
6
, Edexcel Chemistry 1F 2025 Prediction Question Paper
chemical composition. solidifying.
(1 mark)
Question Answers Extra information Mark
Why wax did not boil Wax does not reach its
01.c during heating: boiling point during 1
The boiling point of wax heating because the
is higher than the temperature is
temperature of boiling insufficient to provide
water, so it cannot reach enough energy to
the required temperature overcome intermolecular
to vaporize. forces completely.
Total Question 1 6
Justification for Question Set 1 (States of Matter and Physical Changes)
Justification for Choosing the Question
The topic of states of matter and physical changes is a fundamental concept in chemistry that forms
the basis for understanding more advanced topics such as phase transitions, particle theory, and
thermodynamics. Question 1 was designed to assess students' ability to interpret particle diagrams,
recognize physical changes, and apply their knowledge to real-world scenarios. This question type
has consistently appeared in past papers, emphasizing its importance in the GCSE Chemistry
curriculum.
For example:
• In the 2024 paper (Q1), students were asked to draw particle arrangements for solid wax
and explain why melting is a physical change.
• In the 2022 paper (Q1), students analyzed particle behavior during phase changes like
melting and boiling.
• In the 2018 paper (Q6), the question focused on explaining why phase changes are physical
rather than chemical processes.
7
(Results)
2025 Prediction Paper
Pearson Edexcel GCSE
In Chemistry (1CH0/1F) Paper 1F
, Edexcel Chemistry 1F 2025 Prediction Question Paper
General Marking Guidance
• All candidates must receive the same treatment. Examiners must mark the first
candidate in exactly the same way as they mark the last.
• Mark schemes should be applied positively. Candidates must be rewarded for
what they have shown they can do rather than penalised for omissions.
• Examiners should mark according to the mark scheme not according to their
perception of where the grade boundaries may lie.
• There is no ceiling on achievement. All marks on the mark scheme should be used
appropriately.
• All the marks on the mark scheme are designed to be awarded. Examiners
should always award full marks if deserved, i.e. if the answer matches the
mark scheme. Examiners should also be prepared to award zero marks if the
candidate’s response is not worthy of credit according to the mark scheme.
• Where some judgement is required, mark schemes will provide the principles by
which marks will be awarded and exemplification may be limited.
• When examiners are in doubt regarding the application of the mark scheme
to a candidate’s response, the team leader must be consulted.
• Crossed out work should be marked UNLESS the candidate has replaced it
with an alternative response.
, Edexcel Chemistry 1F 2025 Prediction Question Paper
Find the comprehensive elaborations for the question set provided
beneath the mark scheme for Question 01.
Question 1
Question Answers Extra information Mark
(i) Drawing particle
(i): 3
01.a arrangement in solid wax:
Particles in a solid are tightly
● Particles drawn closely packed in a regular, fixed
packed in a regular arrangement. They cannot
arrangement. (1 mark) move but can only vibrate in
place due to strong
(ii) Difference between
intermolecular forces.
particles in liquid and solid
wax:
(ii):
● Particles in liquid are less Particles in a liquid are less
tightly packed and can organized, can move past each
move past each other, other, and are further apart
unlike the fixed positions compared to solids, allowing
in solids. (1 mark) liquids to flow.
(iii) Explanation of particle
(iii):
movement in gases:
In gases, particles are far apart,
● Particles in a gas move move freely and rapidly in
faster because they have random directions because they
more kinetic energy have maximum kinetic energy.
compared to liquids. (1
mark)
Question Answers Extra information Mark
01.b (i) Name of the process (i): 2
when wax changes from Freezing involves the
liquid to solid: formation of a solid from a
● Correct answer: liquid as thermal energy is
Freezing. (1 mark) lost, reducing particle motion.
(ii) Explanation of why this (ii):
is a physical change: Physical changes do not alter
● The change is physical the substance's chemical
because no new identity; only the state
substance is formed; changes, e.g., wax remains
the wax retains its chemically unchanged when
6
, Edexcel Chemistry 1F 2025 Prediction Question Paper
chemical composition. solidifying.
(1 mark)
Question Answers Extra information Mark
Why wax did not boil Wax does not reach its
01.c during heating: boiling point during 1
The boiling point of wax heating because the
is higher than the temperature is
temperature of boiling insufficient to provide
water, so it cannot reach enough energy to
the required temperature overcome intermolecular
to vaporize. forces completely.
Total Question 1 6
Justification for Question Set 1 (States of Matter and Physical Changes)
Justification for Choosing the Question
The topic of states of matter and physical changes is a fundamental concept in chemistry that forms
the basis for understanding more advanced topics such as phase transitions, particle theory, and
thermodynamics. Question 1 was designed to assess students' ability to interpret particle diagrams,
recognize physical changes, and apply their knowledge to real-world scenarios. This question type
has consistently appeared in past papers, emphasizing its importance in the GCSE Chemistry
curriculum.
For example:
• In the 2024 paper (Q1), students were asked to draw particle arrangements for solid wax
and explain why melting is a physical change.
• In the 2022 paper (Q1), students analyzed particle behavior during phase changes like
melting and boiling.
• In the 2018 paper (Q6), the question focused on explaining why phase changes are physical
rather than chemical processes.
7
