,MVCV’;LKJHGF KUYTRSDXC U76542QAZXCV VCFYUITFC KIUYTRX JUYTERTYUGV U876534WSC
KGFDZXFCGHJNK HGFDSE3QAWZY543212324567876756RFCDE567IKJBGFSD BGRDSXCV
AS-Level OCR 2025 Chemistry B (Salters) Paper 1 Mark Scheme
GCE
KJYTRSDFGHJKLKJHGFDFGHJKJHGF
Chemistry B
OIUYTRESRDFYGUHJKLKJ ,KJHGUYTDREJDS
H033/01: Foundations of chemistry
UYTDSSD8765345670987TFVB GTRESDXCVBO9876RDC
AS Level
FGDSXFGI8765434567809876RDCVB,MNFDSWE4567898765456788
Mark Scheme for June 2025
OCR (Oxford Cambridge and RSA) is a leading UK awarding body, providing a wide range of qualifications to
meet the needs of candidates of all ages and abilities. OCR qualifications include AS/A Levels, Diplomas,
GCSEs, Cambridge Nationals, Cambridge Technicals, Functional Skills, Key Skills, Entry Level qualifications,
NVQs and vocational qualifications in areas such as IT, business, languages, teaching/training, administration
and secretarial skills.
It is also responsible for developing new specifications to meet national requirements and the needs of students
and teachers. OCR is a not-for-profit organisation; any surplus made is invested back into the establishment to
help towards the development of qualifications and support, which keep pace with the changing needs of
today’s society.
This mark scheme is published as an aid to teachers and students, to indicate the requirements of the
examination. It shows the basis on which marks were awarded by examiners. It does not indicate the details of
the discussions which took place at an examiners’ meeting before marking commenced.
All examiners are instructed that alternative correct answers and unexpected approaches in candidates’ scripts
must be given marks that fairly reflect the relevant knowledge and skills demonstrated.
Mark schemes should be read in conjunction with the published question papers and the report on the
examination.
© OCR 2025
Oxford Cambridge and RSA Examinations
, H033/01 Mark Scheme June 2025
MARKING INSTRUCTIONS
PREPARATION FOR MARKING
RM ASSESSOR
1. Make sure that you have accessed and completed the relevant training packages for on-screen marking: RM Assessor Online Training: OCR
Essential Guide to Marking.
2. Make sure that you have read and understood the mark scheme and the question paper for this unit. These are available in RM Assessor
3. Log-in to RM Assessor and mark the required number of practice responses (“scripts”) and the required number of standardisation responses.
MARKING
1. Mark strictly to the mark scheme.
2. Marks awarded must relate directly to the marking criteria.
3. The schedule of dates is very important. It is essential that you meet the RM Assessor 50% and 100% (traditional 40% Batch 1 and 100% Batch 2)
deadlines. If you experience problems, you must contact your Team Leader (Supervisor) without delay.
4. If you are in any doubt about applying the mark scheme, consult your Team Leader by telephone or the RM Assessor messaging system, or by email.
5. Crossed Out Responses
Where a candidate has crossed out a response and provided a clear alternative then the crossed out response is not marked. Where no alternative
response has been provided, examiners may give candidates the benefit of the doubt and mark the crossed out response where legible.
Rubric Error Responses – Optional Questions
Where candidates have a choice of question across a whole paper or a whole section and have provided more answers than required, then all responses
are marked and the highest mark allowable within the rubric is given. Enter a mark for each question answered into RM assessor, which will select the
2
KGFDZXFCGHJNK HGFDSE3QAWZY543212324567876756RFCDE567IKJBGFSD BGRDSXCV
AS-Level OCR 2025 Chemistry B (Salters) Paper 1 Mark Scheme
GCE
KJYTRSDFGHJKLKJHGFDFGHJKJHGF
Chemistry B
OIUYTRESRDFYGUHJKLKJ ,KJHGUYTDREJDS
H033/01: Foundations of chemistry
UYTDSSD8765345670987TFVB GTRESDXCVBO9876RDC
AS Level
FGDSXFGI8765434567809876RDCVB,MNFDSWE4567898765456788
Mark Scheme for June 2025
OCR (Oxford Cambridge and RSA) is a leading UK awarding body, providing a wide range of qualifications to
meet the needs of candidates of all ages and abilities. OCR qualifications include AS/A Levels, Diplomas,
GCSEs, Cambridge Nationals, Cambridge Technicals, Functional Skills, Key Skills, Entry Level qualifications,
NVQs and vocational qualifications in areas such as IT, business, languages, teaching/training, administration
and secretarial skills.
It is also responsible for developing new specifications to meet national requirements and the needs of students
and teachers. OCR is a not-for-profit organisation; any surplus made is invested back into the establishment to
help towards the development of qualifications and support, which keep pace with the changing needs of
today’s society.
This mark scheme is published as an aid to teachers and students, to indicate the requirements of the
examination. It shows the basis on which marks were awarded by examiners. It does not indicate the details of
the discussions which took place at an examiners’ meeting before marking commenced.
All examiners are instructed that alternative correct answers and unexpected approaches in candidates’ scripts
must be given marks that fairly reflect the relevant knowledge and skills demonstrated.
Mark schemes should be read in conjunction with the published question papers and the report on the
examination.
© OCR 2025
Oxford Cambridge and RSA Examinations
, H033/01 Mark Scheme June 2025
MARKING INSTRUCTIONS
PREPARATION FOR MARKING
RM ASSESSOR
1. Make sure that you have accessed and completed the relevant training packages for on-screen marking: RM Assessor Online Training: OCR
Essential Guide to Marking.
2. Make sure that you have read and understood the mark scheme and the question paper for this unit. These are available in RM Assessor
3. Log-in to RM Assessor and mark the required number of practice responses (“scripts”) and the required number of standardisation responses.
MARKING
1. Mark strictly to the mark scheme.
2. Marks awarded must relate directly to the marking criteria.
3. The schedule of dates is very important. It is essential that you meet the RM Assessor 50% and 100% (traditional 40% Batch 1 and 100% Batch 2)
deadlines. If you experience problems, you must contact your Team Leader (Supervisor) without delay.
4. If you are in any doubt about applying the mark scheme, consult your Team Leader by telephone or the RM Assessor messaging system, or by email.
5. Crossed Out Responses
Where a candidate has crossed out a response and provided a clear alternative then the crossed out response is not marked. Where no alternative
response has been provided, examiners may give candidates the benefit of the doubt and mark the crossed out response where legible.
Rubric Error Responses – Optional Questions
Where candidates have a choice of question across a whole paper or a whole section and have provided more answers than required, then all responses
are marked and the highest mark allowable within the rubric is given. Enter a mark for each question answered into RM assessor, which will select the
2
