T88UB XJCIGYEVD IE87YGV UHVC XCKUSYDGSDS DKUGVSD SNDSSUSHSJKSIUSV CIXCY
DISCB SICSGSVF DKDIUYG DFDX8DYWDB
Oxford Cambridge and RSA
KUYGFTDGVHSJDNS XBCXC DKSUDVS SJUDYSFCD WEOW876TRFV FDFLDF987TWFEGVE WNMDSS0F96WRTEFGVWE
WNEW
KU7 SKJYW5E67EB3 R3203URBV V;C-8YEGV VCVIF7FCDSC;V098FWDV V;O9876TWENW VC UO
A-Level OCR 2025 Chemistry B (Salters) Paper 1
Tuesday 10 June 2025 – Morning
A Level Chemistry B (Salters)
H433/01 Fundamentals of Chemistry
Time allowed: 2 hours 15 minutes
1
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
Your answer [1]
© OCR 2025
, 3
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
Your answer [1]
© OCR 2025 Turn over
DISCB SICSGSVF DKDIUYG DFDX8DYWDB
Oxford Cambridge and RSA
KUYGFTDGVHSJDNS XBCXC DKSUDVS SJUDYSFCD WEOW876TRFV FDFLDF987TWFEGVE WNMDSS0F96WRTEFGVWE
WNEW
KU7 SKJYW5E67EB3 R3203URBV V;C-8YEGV VCVIF7FCDSC;V098FWDV V;O9876TWENW VC UO
A-Level OCR 2025 Chemistry B (Salters) Paper 1
Tuesday 10 June 2025 – Morning
A Level Chemistry B (Salters)
H433/01 Fundamentals of Chemistry
Time allowed: 2 hours 15 minutes
1
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
Your answer [1]
© OCR 2025
, 3
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
Your answer [1]
© OCR 2025 Turn over
