Tuesday 19 May 2026 – Morning
AS Level Chemistry B (Salters)
H033/02 Chemistry in depth
Time allowed: 1 hour 30 minutes
You must have:
* 2 6 4 6 7 8 7 3 8 0 *
• the Data Sheet for Chemistry B
You can use:
• a scientific or graphical calculator
• an HB pencil
* H 0 3 3 0 2 *
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined page at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 20 pages.
ADVICE
• Read each question carefully before you start your answer.
© Cambridge OCR 2026 [601/5446/9] Cambridge OCR is an exempt Charity
DC (WW/SG) 360426/4 Turn over
, 2
1 Poly(propene) is a commonly used plastic material.
It is made by the polymerisation of the alkene propene, CH3CH=CH2.
(a) There is a double bond between two carbon atoms in propene.
Complete and label the diagram below to show the position of the π and σ bonds that make up
the double bond.
C C
[2]
(b) Identify whether propene shows cis/trans isomerism and explain why it does or does not.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..................................................................................................................................................... [2]
(c) Draw the full structural formula for the repeating unit of poly(propene).
[2]
(d) Propene reacts with HBr to form two possible products.
Draw the skeletal formulae of these products in the boxes.
[2]
© Cambridge OCR 2026
, 3
(e) A different alkene, but-1-ene, CH3CH2CH=CH2, reacts with HBr.
The major product of this reaction is 2-bromobutane, CH3CH2CHBrCH3.
In the first step of the mechanism of this reaction, an electrophile attacks the alkene.
A cation and an anion are formed.
Show this first step below.
Include ‘curly arrows’ and charges.
CH3 CH2 CH CH2
+ H Br
cation anion
[4]
© Cambridge OCR 2026 Turn over
AS Level Chemistry B (Salters)
H033/02 Chemistry in depth
Time allowed: 1 hour 30 minutes
You must have:
* 2 6 4 6 7 8 7 3 8 0 *
• the Data Sheet for Chemistry B
You can use:
• a scientific or graphical calculator
• an HB pencil
* H 0 3 3 0 2 *
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined page at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 20 pages.
ADVICE
• Read each question carefully before you start your answer.
© Cambridge OCR 2026 [601/5446/9] Cambridge OCR is an exempt Charity
DC (WW/SG) 360426/4 Turn over
, 2
1 Poly(propene) is a commonly used plastic material.
It is made by the polymerisation of the alkene propene, CH3CH=CH2.
(a) There is a double bond between two carbon atoms in propene.
Complete and label the diagram below to show the position of the π and σ bonds that make up
the double bond.
C C
[2]
(b) Identify whether propene shows cis/trans isomerism and explain why it does or does not.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..................................................................................................................................................... [2]
(c) Draw the full structural formula for the repeating unit of poly(propene).
[2]
(d) Propene reacts with HBr to form two possible products.
Draw the skeletal formulae of these products in the boxes.
[2]
© Cambridge OCR 2026
, 3
(e) A different alkene, but-1-ene, CH3CH2CH=CH2, reacts with HBr.
The major product of this reaction is 2-bromobutane, CH3CH2CHBrCH3.
In the first step of the mechanism of this reaction, an electrophile attacks the alkene.
A cation and an anion are formed.
Show this first step below.
Include ‘curly arrows’ and charges.
CH3 CH2 CH CH2
+ H Br
cation anion
[4]
© Cambridge OCR 2026 Turn over
