Cambridge International AS & A Level
CHEMISTRY 9701/31
Paper 3 Advanced Practical Skills 1 May/June 2025
CONFIDENTIAL INSTRUCTIONS
* 0 2 6 8 4 6 3 0 2 5 *
This document gives details of how to prepare for and administer the practical exam.
The information in this document and the identity of any materials supplied by Cambridge International
are confidential and must NOT reach candidates either directly or indirectly.
The supervisor must complete the report at the end of this document and return it with the scripts.
INSTRUCTIONS
● If you have any queries regarding these confidential instructions, contact Cambridge International
stating the centre number, the syllabus and component number and the nature of the query.
email
phone +44 1223 553554
This document has 8 pages. Any blank pages are indicated.
DC (PQ) 338073/2
© UCLES 2025 [Turn over
, 2
General information about practical exams
Centres must follow the guidance on science practical exams given in the Cambridge Handbook.
Safety
Supervisors must follow national and local regulations relating to safety and first aid.
Only those procedures described in the question paper should be attempted.
Supervisors must inform candidates that materials and apparatus used in the exam should be treated
with caution. Suitable eye protection should be used where necessary.
The following hazard codes are used in these confidential instructions, where relevant:
C corrosive MH moderate hazard
HH health hazard T acutely toxic
F flammable O oxidising
N hazardous to the aquatic environment
Hazard data sheets relating to substances used in this exam should be available from your chemical
supplier.
Before the exam
● The packets containing the question papers must not be opened before the exam.
● It is assumed that standard school laboratory facilities, as indicated in the Guide to Planning
Practical Science, will be available.
● Spare materials and apparatus for the tasks set must be available for candidates, if required.
During the exam
● It must be made clear to candidates at the start of the exam that they may request spare materials
and apparatus for the tasks set.
● Where specified, the supervisor must perform the experiments and record the results as instructed.
This must be done out of sight of the candidates, using the same materials and apparatus as the
candidates.
● Any assistance provided to candidates must be recorded in the supervisor’s report.
● If any materials or apparatus need to be replaced, for example, in the event of breakage or loss,
this must be recorded in the supervisor’s report.
After the exam
● The supervisor must complete a report for each practical session held and each laboratory used.
● Each packet of scripts returned to Cambridge International must contain the following items:
– the scripts of the candidates specified on the bar code label provided
– the supervisor’s results relevant to these candidates
– the supervisor’s reports relevant to these candidates
– seating plans for each practical session, referring to each candidate by candidate number
– the attendance register.
© UCLES 2025 9701/31/CI/M/J/25
CHEMISTRY 9701/31
Paper 3 Advanced Practical Skills 1 May/June 2025
CONFIDENTIAL INSTRUCTIONS
* 0 2 6 8 4 6 3 0 2 5 *
This document gives details of how to prepare for and administer the practical exam.
The information in this document and the identity of any materials supplied by Cambridge International
are confidential and must NOT reach candidates either directly or indirectly.
The supervisor must complete the report at the end of this document and return it with the scripts.
INSTRUCTIONS
● If you have any queries regarding these confidential instructions, contact Cambridge International
stating the centre number, the syllabus and component number and the nature of the query.
phone +44 1223 553554
This document has 8 pages. Any blank pages are indicated.
DC (PQ) 338073/2
© UCLES 2025 [Turn over
, 2
General information about practical exams
Centres must follow the guidance on science practical exams given in the Cambridge Handbook.
Safety
Supervisors must follow national and local regulations relating to safety and first aid.
Only those procedures described in the question paper should be attempted.
Supervisors must inform candidates that materials and apparatus used in the exam should be treated
with caution. Suitable eye protection should be used where necessary.
The following hazard codes are used in these confidential instructions, where relevant:
C corrosive MH moderate hazard
HH health hazard T acutely toxic
F flammable O oxidising
N hazardous to the aquatic environment
Hazard data sheets relating to substances used in this exam should be available from your chemical
supplier.
Before the exam
● The packets containing the question papers must not be opened before the exam.
● It is assumed that standard school laboratory facilities, as indicated in the Guide to Planning
Practical Science, will be available.
● Spare materials and apparatus for the tasks set must be available for candidates, if required.
During the exam
● It must be made clear to candidates at the start of the exam that they may request spare materials
and apparatus for the tasks set.
● Where specified, the supervisor must perform the experiments and record the results as instructed.
This must be done out of sight of the candidates, using the same materials and apparatus as the
candidates.
● Any assistance provided to candidates must be recorded in the supervisor’s report.
● If any materials or apparatus need to be replaced, for example, in the event of breakage or loss,
this must be recorded in the supervisor’s report.
After the exam
● The supervisor must complete a report for each practical session held and each laboratory used.
● Each packet of scripts returned to Cambridge International must contain the following items:
– the scripts of the candidates specified on the bar code label provided
– the supervisor’s results relevant to these candidates
– the supervisor’s reports relevant to these candidates
– seating plans for each practical session, referring to each candidate by candidate number
– the attendance register.
© UCLES 2025 9701/31/CI/M/J/25
