Mark Scheme (Results)
Summer 2024
Pearson Edexcel GCSE
In Chemistry (1CH0)
Paper 2H
,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.
, Question Answer Additional guidance Mark
number
1(a)(i) the less stone there is, the stronger the take ‘it’ to mean amount of stone (1)
concrete/ more stone, less strength AO3 1
Question Answer Mark
number
1(a)(ii) C 7500 kg is the only correct answer. (1)
AO3 1
A, B and D are incorrect because the sand: stone ratio is not 2:3
Question Answer Additional guidance Mark
number
1(a)(iii) giant covalent / macromolecular giant and covalent required (1)
ignore lattice AO3 1
reject ionic
Question Answer Mark
number
1(b)(i) D nanoparticles are larger than atoms and molecules is the only correct answer. (1)
AO1 1
A, B and C are incorrect because nanoparticles are made of a few hundred atoms
Question Answer Additional guidance Mark
number
1(b)(ii) an explanation linking any two from (2)
AO1 1
• {reflect/ absorb/ block/ protects from} UV ignore sun/ sunlight/ sun’s rays/ IR
(light) (1)
• so prevent {sunburn/ skin damage} (1) allow prevents (skin) cancer/ cell damage;
ignore ‘protects the skin’
• nanoparticles are {very small/ allow large SA: vol ratio
<100nm/ <1 x 10-7m } (1) ignore large surface area
Summer 2024
Pearson Edexcel GCSE
In Chemistry (1CH0)
Paper 2H
,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.
, Question Answer Additional guidance Mark
number
1(a)(i) the less stone there is, the stronger the take ‘it’ to mean amount of stone (1)
concrete/ more stone, less strength AO3 1
Question Answer Mark
number
1(a)(ii) C 7500 kg is the only correct answer. (1)
AO3 1
A, B and D are incorrect because the sand: stone ratio is not 2:3
Question Answer Additional guidance Mark
number
1(a)(iii) giant covalent / macromolecular giant and covalent required (1)
ignore lattice AO3 1
reject ionic
Question Answer Mark
number
1(b)(i) D nanoparticles are larger than atoms and molecules is the only correct answer. (1)
AO1 1
A, B and C are incorrect because nanoparticles are made of a few hundred atoms
Question Answer Additional guidance Mark
number
1(b)(ii) an explanation linking any two from (2)
AO1 1
• {reflect/ absorb/ block/ protects from} UV ignore sun/ sunlight/ sun’s rays/ IR
(light) (1)
• so prevent {sunburn/ skin damage} (1) allow prevents (skin) cancer/ cell damage;
ignore ‘protects the skin’
• nanoparticles are {very small/ allow large SA: vol ratio
<100nm/ <1 x 10-7m } (1) ignore large surface area
