Tuesday 12 May 2026 – Morning
AS Level Chemistry B (Salters)
H033/01 Foundations of chemistry
Time allowed: 1 hour 30 minutes
You must have:
* 2 6 4 7 4 2 0 9 4 2 *
• the Data Sheet for Chemistry B
You can use:
• a scientific or graphical calculator
• an HB pencil
* H 0 3 3 0 1 *
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 [ ].
• 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 (SL/TC) 360137/3 Turn over
, 2
Section A
You should spend a maximum of 25 minutes on this section.
Write your answer to each question in the box provided.
1 The relative atomic mass of chlorine is 35.5.
What can be deduced from this?
A An atom of chlorine has 18.5 neutrons.
B An atom of chlorine weighs 35.5 times as much as an atom of hydrogen.
C The mass spectrum of chlorine has a peak at m/z = 35.5.
D There are at least two isotopes of chlorine.
Your answer [1]
2 Many models were suggested in the development of the structure of the atom.
One model described atoms as negative charges embedded in a sphere of positive charge.
Which descriptive model came next in the development of the structure of the atom?
A Atoms are single spheres.
B Atoms contain neutrons.
C Atoms have a nucleus surrounded by electrons.
D Atoms have electrons arranged in shells.
Your answer [1]
3 Which ion forms an insoluble sulfate?
A Ba2+
B Fe2+
C Fe3+
D NH4+
Your answer [1]
© Cambridge OCR 2026
, 3
4 Which radiation has the longest wavelength?
A blue light
B infrared
C red light
D ultraviolet
Your answer [1]
5 Which reaction is a nucleophilic substitution?
A C2H4 + Br2 C2H4Br2
B C4H9Cl + H2O C4H9OH + HCl
C C2H5OH C2H4 + H2O
D Cl + O3 Cl O + O2
Your answer [1]
6 Which molecule is the most polar?
A CF4
B CH3F
C CH3Cl
D CO2
Your answer [1]
7 A liquid product is being purified.
At which stage is distillation used?
A as the final stage
B before drying
C before shaking with sodium carbonate solution
D before the use of a separating funnel
Your answer [1]
© Cambridge OCR 2026 Turn over
AS Level Chemistry B (Salters)
H033/01 Foundations of chemistry
Time allowed: 1 hour 30 minutes
You must have:
* 2 6 4 7 4 2 0 9 4 2 *
• the Data Sheet for Chemistry B
You can use:
• a scientific or graphical calculator
• an HB pencil
* H 0 3 3 0 1 *
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 [ ].
• 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 (SL/TC) 360137/3 Turn over
, 2
Section A
You should spend a maximum of 25 minutes on this section.
Write your answer to each question in the box provided.
1 The relative atomic mass of chlorine is 35.5.
What can be deduced from this?
A An atom of chlorine has 18.5 neutrons.
B An atom of chlorine weighs 35.5 times as much as an atom of hydrogen.
C The mass spectrum of chlorine has a peak at m/z = 35.5.
D There are at least two isotopes of chlorine.
Your answer [1]
2 Many models were suggested in the development of the structure of the atom.
One model described atoms as negative charges embedded in a sphere of positive charge.
Which descriptive model came next in the development of the structure of the atom?
A Atoms are single spheres.
B Atoms contain neutrons.
C Atoms have a nucleus surrounded by electrons.
D Atoms have electrons arranged in shells.
Your answer [1]
3 Which ion forms an insoluble sulfate?
A Ba2+
B Fe2+
C Fe3+
D NH4+
Your answer [1]
© Cambridge OCR 2026
, 3
4 Which radiation has the longest wavelength?
A blue light
B infrared
C red light
D ultraviolet
Your answer [1]
5 Which reaction is a nucleophilic substitution?
A C2H4 + Br2 C2H4Br2
B C4H9Cl + H2O C4H9OH + HCl
C C2H5OH C2H4 + H2O
D Cl + O3 Cl O + O2
Your answer [1]
6 Which molecule is the most polar?
A CF4
B CH3F
C CH3Cl
D CO2
Your answer [1]
7 A liquid product is being purified.
At which stage is distillation used?
A as the final stage
B before drying
C before shaking with sodium carbonate solution
D before the use of a separating funnel
Your answer [1]
© Cambridge OCR 2026 Turn over
