2025 OCR A Level Chemistry B (Salters)
H433/01 Fundamentals of Chemistry
Verified Question paper with Marking Scheme Attached
Oxford Cambridge and RSA
Tuesday 10 June 2025 – Morning
A Level Chemistry B (Salters)
H433/01 Fundamentals of Chemistry
Time allowed: 2 hours 15 minutes
You must have:
• the Data Sheet for Chemistry B
You can use:
• a scientific or graphical calculator
• an HB pencil
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 110.
• 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 28 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 [601/5371/4] OCR is an exempt Charity
DC (PQ/CB) 346688/5 Turn over
, 2
Section A
You should spend a maximum of 40 minutes on this section.
Write your answer to each question in the box provided.
1 Part of a protein structure can be represented as: –
CONHCH(CH3)CONHCH2CONHCH(CH3)–
What is correct about this part of the protein structure?
A All its amino acids show optical isomerism.
B It has three peptide links.
C It is an addition polymer.
D It is made from three different amino acids.
Your answer [1]
2 What is correct about the greenhouse effect?
A Greenhouse gas bonds vibrate more when warmed by infrared radiation.
B Greenhouse gases reflect infrared radiation back to Earth.
C The Earth emits mostly ultraviolet radiation.
D The principal radiation from the Sun is infrared.
Your answer [1]
3 An organic compound A is oxidised to a different compound which forms a silver mirror with Tollens’
reagent.
Which could be compound A?
A propanal
B propan-1-ol
C propan-2-ol
D propanone
© OCR 2025
, 3
Your answer [1]
© OCR 2025 Turn over
, 4
4 Which statement about transition metals is correct?
A Copper(II) ions form an octahedral complex with chloride ions.
B Most manganese compounds have Mn in the oxidation state of +2, +4 or +7.
C Nickel is used as a catalyst in the hydration of alkenes.
D The dichromate ion is often used as a reducing agent.
Your answer [1]
5 Which statement about the element astatine, At, is likely to be correct?
A It displaces iodine from sodium iodide.
B It is a gas at room temperature.
C It is a weaker oxidising agent than chlorine.
D It is colourless.
Your answer [1]
6 Which of the following pairs can be structural isomers?
A acid anhydrides and aldehydes
B amines and amides
C carboxylic acids and esters
D diols and esters
Your answer [1]
7 Which row shows the correct electron configurations of Cr and Cr3+?
Cr Cr3+
A [Ar] 3d4 4s2 [Ar] 3d3
B [Ar] 3d4 4s2 [Ar] 3d1 4s2
C [Ar] 3d5 4s1 [Ar] 3d3
D [Ar] 3d5 4s1 [Ar] 3d1 4s2
© OCR 2025
H433/01 Fundamentals of Chemistry
Verified Question paper with Marking Scheme Attached
Oxford Cambridge and RSA
Tuesday 10 June 2025 – Morning
A Level Chemistry B (Salters)
H433/01 Fundamentals of Chemistry
Time allowed: 2 hours 15 minutes
You must have:
• the Data Sheet for Chemistry B
You can use:
• a scientific or graphical calculator
• an HB pencil
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 110.
• 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 28 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 [601/5371/4] OCR is an exempt Charity
DC (PQ/CB) 346688/5 Turn over
, 2
Section A
You should spend a maximum of 40 minutes on this section.
Write your answer to each question in the box provided.
1 Part of a protein structure can be represented as: –
CONHCH(CH3)CONHCH2CONHCH(CH3)–
What is correct about this part of the protein structure?
A All its amino acids show optical isomerism.
B It has three peptide links.
C It is an addition polymer.
D It is made from three different amino acids.
Your answer [1]
2 What is correct about the greenhouse effect?
A Greenhouse gas bonds vibrate more when warmed by infrared radiation.
B Greenhouse gases reflect infrared radiation back to Earth.
C The Earth emits mostly ultraviolet radiation.
D The principal radiation from the Sun is infrared.
Your answer [1]
3 An organic compound A is oxidised to a different compound which forms a silver mirror with Tollens’
reagent.
Which could be compound A?
A propanal
B propan-1-ol
C propan-2-ol
D propanone
© OCR 2025
, 3
Your answer [1]
© OCR 2025 Turn over
, 4
4 Which statement about transition metals is correct?
A Copper(II) ions form an octahedral complex with chloride ions.
B Most manganese compounds have Mn in the oxidation state of +2, +4 or +7.
C Nickel is used as a catalyst in the hydration of alkenes.
D The dichromate ion is often used as a reducing agent.
Your answer [1]
5 Which statement about the element astatine, At, is likely to be correct?
A It displaces iodine from sodium iodide.
B It is a gas at room temperature.
C It is a weaker oxidising agent than chlorine.
D It is colourless.
Your answer [1]
6 Which of the following pairs can be structural isomers?
A acid anhydrides and aldehydes
B amines and amides
C carboxylic acids and esters
D diols and esters
Your answer [1]
7 Which row shows the correct electron configurations of Cr and Cr3+?
Cr Cr3+
A [Ar] 3d4 4s2 [Ar] 3d3
B [Ar] 3d4 4s2 [Ar] 3d1 4s2
C [Ar] 3d5 4s1 [Ar] 3d3
D [Ar] 3d5 4s1 [Ar] 3d1 4s2
© OCR 2025
