Cambridge International AS & A Level Cambridge International AS & A Level
CHEMISTRY 9701/13 COMPUTER SCIENCE 9618/13
Paper 1 Multiple Choice May/June 2026 Paper 1 Theory Fundamentals May/June 2026
1 hour 15 minutes MARK SCHEME
Maximum Mark: 75
You must answer on the multiple choice answer sheet.
You will need: Multiple choice answer sheet
*
Soft clean eraser
Published
Soft pencil (type B or HB is recommended)
INSTRUCTIONS
• Therearefortyquestionsonthispaper.Answerallquestions. This mark scheme contains the instructions and marking guidance that our examiners used to mark
*
• ForeachquestiontherearefourpossibleanswersA,B,CandD.Choosetheoneyouconsidercorrect candidate responses for this component.
andrecordyourchoiceinsoftpencilonthemultiplechoiceanswersheet.
• Followtheinstructionsonthemultiplechoiceanswersheet. Before they start marking, examiners complete a standardisation process. They review a range of candidate
• Writeinsoftpencil. responses and discuss the mark scheme in detail to agree which answers can and cannot be accepted.
• Writeyourname,centrenumberandcandidatenumberonthemultiplechoiceanswersheetinthe Examiners award marks where it is clear that candidate responses have met the requirements of the mark
spacesprovidedunlessthishasbeendoneforyou. scheme. These requirements may vary between different components or different versions of the same
component, depending on the exact requirements of the question and the candidate responses seen during
• Donotusecorrectionfluidortape. the standardisation process.
• Donotwriteonanybarcodes.
• Youmayuseacalculator. Sometimes, our mark schemes may allow marks to be awarded to responses which contain elements that
are factually incorrect or for content not covered by the syllabus. We do this in response to the demands of a
specific question to support candidates and make sure that our assessments are fair. However, these
INFORMATION allowances should not be used as a guide for teaching and learning.
• The total mark for this paper is 40.
• Each correct answer will score one mark. We cannot discuss the mark scheme with schools, and we recommend that schools read the mark scheme
together with the assessment material and the Principal Examiner Report for Teachers.
• Any rough working should be done on this question paper.
• The Periodic Table is printed in the question paper.
• Important values, constants and standards are printed in the question paper.
This document has 20 pages. Any blank pages are indicated.
06_9701_13_2026_1.20 This document consists of 16 printed pages.
Cambridge University Press & Assessment 2026 [Turn over
Cambridge University Press & Assessment 2026 [Turn over
, 2 9618/13 Cambridge International AS & A Level – Mark Scheme May/June 2026
PUBLISHED
General marking principles
3+
1 What is the electronic configuration of Cr ?
All examiners must apply these marking principles when marking candidate responses.
1 2
A [Ar] 3d 4s
B [Ar] 3d 4s
2 2 1 Examiners must award marks for each response in line with:
3 0
C [Ar] 3d 4s • the specific content defined in the mark scheme
4 0 • the specific skills defined in the mark scheme or in the level descriptions
D [Ar] 3d 4s
• the standard of response required as exemplified by the standardisation scripts.
2 Examiners must award whole marks (not half marks, or other fractions).
2 Which molecule has the greatest bond angle?
3 Examiners must award marks positively. This means that:
A SCl 2 B BCl 3 C PCl 3 D CCl 4
• marks are not deducted for errors or omissions
• marks are awarded for correct/valid answers as defined in the mark scheme and also for other valid answers which go beyond the
3 Antimony is produced in a 2-stage process from its sulfide, Sb2S3. scope of the syllabus and mark scheme referring to your team leader as appropriate
• the quality of spelling, punctuation and grammar are judged only when the mark scheme indicates that these features are specifically
• Sb2S3 is heated in oxygen, producing Sb2O3 and SO2. assessed in the question. However, the meaning of all responses must be unambiguous.
• The Sb2O3 is then reduced by carbon, producing Sb and CO2.
4 Examiners must consistently apply the requirements of the mark scheme and any rules for what to do when candidates have not followed
What is the maximum volume of CO2, measured at room conditions, produced from instructions correctly.
20 mol of Sb2S3?
5 Examiners must use the full range of marks defined in the mark scheme, unless limited by the quality of the candidate responses seen.
3 3 3 3
A 30 dm B 360 dm C 720 dm D 1440 dm
6 Examiners must award marks according to the mark scheme and must not award marks with grade thresholds or grade descriptions in
mind.
68
4 The Ge isotope undergoes a natural radioactive process to give an isotope of a
68 68
different element, X. This transformation of Ge occurs when an electron enters the
nucleus and changes a proton into a neutron.
68
Which statement about the composition of an atom of X is correct?
A It has 37 neutrons.
B It has 13 electrons in its 4th shell.
C It has 4 electrons in its 4p orbital.
D Its proton number is 32. Cambridge University Press & Assessment 2026 Page 2 of 16
5 Oxygen reacts with ammonia to form nitrogen(II) oxide, NO, and steam.
How many moles of oxygen are required to convert 10.0 mol of ammonia into nitrogen(II)
oxide and steam?
A 5.0 B 12.5 C 15.0 D 25.0
Cambridge University Press & Assessment 2026 06_9701_13_2026_1.20
, 3 9618/13 Cambridge International AS & A Level – Mark Scheme May/June 2026
PUBLISHED
Annotations guidance for centres
6 Some orbital overlaps that occur in molecules are listed.
Examiners use a system of annotations as a shorthand for communicating their marking decisions to one another. Examiners are trained during the
1 a p orbital with a p orbital standardisation process on how and when to use annotations. The purpose of annotations is to inform the standardisation and monitoring
processes and guide the supervising examiners when they are checking the work of examiners within their team. The meaning of annotations and
2 a p orbital with an sp hybrid orbital how they are used is specific to each component and is understood by all examiners who mark the component.
3 an s orbital with an sp hybrid orbital
We publish annotations in our mark schemes to help centres understand the annotations they may see on copies of scripts. Note that there may
4 an sp hybrid orbital with an sp hybrid orbital not be a direct correlation between the number of annotations on a script and the mark awarded. Similarly, the use of an annotation may not be an
indication of the quality of the response.
Which orbital overlaps occur in the ethyne molecule, H–C≡C–H?
The annotations listed below were available to examiners marking this component in this series.
A 1, 2, 3 and 4
Annotations
B 1, 3 and 4 only
C 1 and 4 only Annotation Meaning
D 2, 3 and 4 only Correct
7 In the ideal gas equation pV = nRT, what do the symbols n and T represent? Incorrect
To indicate where a key word/phrase/code is missing.
n T
A number of molecules temperature in °C Not relevant or used to separate parts of an answer.
B number of molecules temperature in K
C number of moles Indicates a part of the answer that is incorrect.
temperature in °C
D number of moles temperature in K Highlighter To draw attention to a particular aspect or to indicate where parts of an answer have been combined.
Too vague.
Repetition
No examples or not enough.
Cambridge University Press & Assessment 2026 Page 3 of 16
Cambridge University Press & Assessment 2026 06_9701_13_2026_1.20 [Turn over
CHEMISTRY 9701/13 COMPUTER SCIENCE 9618/13
Paper 1 Multiple Choice May/June 2026 Paper 1 Theory Fundamentals May/June 2026
1 hour 15 minutes MARK SCHEME
Maximum Mark: 75
You must answer on the multiple choice answer sheet.
You will need: Multiple choice answer sheet
*
Soft clean eraser
Published
Soft pencil (type B or HB is recommended)
INSTRUCTIONS
• Therearefortyquestionsonthispaper.Answerallquestions. This mark scheme contains the instructions and marking guidance that our examiners used to mark
*
• ForeachquestiontherearefourpossibleanswersA,B,CandD.Choosetheoneyouconsidercorrect candidate responses for this component.
andrecordyourchoiceinsoftpencilonthemultiplechoiceanswersheet.
• Followtheinstructionsonthemultiplechoiceanswersheet. Before they start marking, examiners complete a standardisation process. They review a range of candidate
• Writeinsoftpencil. responses and discuss the mark scheme in detail to agree which answers can and cannot be accepted.
• Writeyourname,centrenumberandcandidatenumberonthemultiplechoiceanswersheetinthe Examiners award marks where it is clear that candidate responses have met the requirements of the mark
spacesprovidedunlessthishasbeendoneforyou. scheme. These requirements may vary between different components or different versions of the same
component, depending on the exact requirements of the question and the candidate responses seen during
• Donotusecorrectionfluidortape. the standardisation process.
• Donotwriteonanybarcodes.
• Youmayuseacalculator. Sometimes, our mark schemes may allow marks to be awarded to responses which contain elements that
are factually incorrect or for content not covered by the syllabus. We do this in response to the demands of a
specific question to support candidates and make sure that our assessments are fair. However, these
INFORMATION allowances should not be used as a guide for teaching and learning.
• The total mark for this paper is 40.
• Each correct answer will score one mark. We cannot discuss the mark scheme with schools, and we recommend that schools read the mark scheme
together with the assessment material and the Principal Examiner Report for Teachers.
• Any rough working should be done on this question paper.
• The Periodic Table is printed in the question paper.
• Important values, constants and standards are printed in the question paper.
This document has 20 pages. Any blank pages are indicated.
06_9701_13_2026_1.20 This document consists of 16 printed pages.
Cambridge University Press & Assessment 2026 [Turn over
Cambridge University Press & Assessment 2026 [Turn over
, 2 9618/13 Cambridge International AS & A Level – Mark Scheme May/June 2026
PUBLISHED
General marking principles
3+
1 What is the electronic configuration of Cr ?
All examiners must apply these marking principles when marking candidate responses.
1 2
A [Ar] 3d 4s
B [Ar] 3d 4s
2 2 1 Examiners must award marks for each response in line with:
3 0
C [Ar] 3d 4s • the specific content defined in the mark scheme
4 0 • the specific skills defined in the mark scheme or in the level descriptions
D [Ar] 3d 4s
• the standard of response required as exemplified by the standardisation scripts.
2 Examiners must award whole marks (not half marks, or other fractions).
2 Which molecule has the greatest bond angle?
3 Examiners must award marks positively. This means that:
A SCl 2 B BCl 3 C PCl 3 D CCl 4
• marks are not deducted for errors or omissions
• marks are awarded for correct/valid answers as defined in the mark scheme and also for other valid answers which go beyond the
3 Antimony is produced in a 2-stage process from its sulfide, Sb2S3. scope of the syllabus and mark scheme referring to your team leader as appropriate
• the quality of spelling, punctuation and grammar are judged only when the mark scheme indicates that these features are specifically
• Sb2S3 is heated in oxygen, producing Sb2O3 and SO2. assessed in the question. However, the meaning of all responses must be unambiguous.
• The Sb2O3 is then reduced by carbon, producing Sb and CO2.
4 Examiners must consistently apply the requirements of the mark scheme and any rules for what to do when candidates have not followed
What is the maximum volume of CO2, measured at room conditions, produced from instructions correctly.
20 mol of Sb2S3?
5 Examiners must use the full range of marks defined in the mark scheme, unless limited by the quality of the candidate responses seen.
3 3 3 3
A 30 dm B 360 dm C 720 dm D 1440 dm
6 Examiners must award marks according to the mark scheme and must not award marks with grade thresholds or grade descriptions in
mind.
68
4 The Ge isotope undergoes a natural radioactive process to give an isotope of a
68 68
different element, X. This transformation of Ge occurs when an electron enters the
nucleus and changes a proton into a neutron.
68
Which statement about the composition of an atom of X is correct?
A It has 37 neutrons.
B It has 13 electrons in its 4th shell.
C It has 4 electrons in its 4p orbital.
D Its proton number is 32. Cambridge University Press & Assessment 2026 Page 2 of 16
5 Oxygen reacts with ammonia to form nitrogen(II) oxide, NO, and steam.
How many moles of oxygen are required to convert 10.0 mol of ammonia into nitrogen(II)
oxide and steam?
A 5.0 B 12.5 C 15.0 D 25.0
Cambridge University Press & Assessment 2026 06_9701_13_2026_1.20
, 3 9618/13 Cambridge International AS & A Level – Mark Scheme May/June 2026
PUBLISHED
Annotations guidance for centres
6 Some orbital overlaps that occur in molecules are listed.
Examiners use a system of annotations as a shorthand for communicating their marking decisions to one another. Examiners are trained during the
1 a p orbital with a p orbital standardisation process on how and when to use annotations. The purpose of annotations is to inform the standardisation and monitoring
processes and guide the supervising examiners when they are checking the work of examiners within their team. The meaning of annotations and
2 a p orbital with an sp hybrid orbital how they are used is specific to each component and is understood by all examiners who mark the component.
3 an s orbital with an sp hybrid orbital
We publish annotations in our mark schemes to help centres understand the annotations they may see on copies of scripts. Note that there may
4 an sp hybrid orbital with an sp hybrid orbital not be a direct correlation between the number of annotations on a script and the mark awarded. Similarly, the use of an annotation may not be an
indication of the quality of the response.
Which orbital overlaps occur in the ethyne molecule, H–C≡C–H?
The annotations listed below were available to examiners marking this component in this series.
A 1, 2, 3 and 4
Annotations
B 1, 3 and 4 only
C 1 and 4 only Annotation Meaning
D 2, 3 and 4 only Correct
7 In the ideal gas equation pV = nRT, what do the symbols n and T represent? Incorrect
To indicate where a key word/phrase/code is missing.
n T
A number of molecules temperature in °C Not relevant or used to separate parts of an answer.
B number of molecules temperature in K
C number of moles Indicates a part of the answer that is incorrect.
temperature in °C
D number of moles temperature in K Highlighter To draw attention to a particular aspect or to indicate where parts of an answer have been combined.
Too vague.
Repetition
No examples or not enough.
Cambridge University Press & Assessment 2026 Page 3 of 16
Cambridge University Press & Assessment 2026 06_9701_13_2026_1.20 [Turn over
