AS LEVEL CHEMISTRY B (SALTERS): Actual May 2025 PAST PAPER 1: Foundations of chemistry.
All Assessment Questions & Mark Scheme [OCR H033/01]
Exam Resource Summary
The AS Level Chemistry B (Salters) May 2025 Paper 1: Foundations of Chemistry (OCR
H033/01) – All Assessment Questions & Mark Scheme combines the full official examination
paper with its detailed mark scheme, providing a complete and structured resource for revision
and exam practice. This paper assesses students’ understanding of the fundamental concepts of
chemistry, including atomic structure, bonding, periodic trends, quantitative chemistry,
redox reactions, and organic foundations. It also evaluates practical and analytical skills
through data interpretation and problem-solving tasks that link theory to real-world chemical
contexts. The merged format aligns each question directly with its marking criteria, offering clear
insight into examiner expectations, mark allocation, and effective response strategies. This
resource is essential for focused revision, self-assessment, and the development of core
chemical understanding and analytical skills, ensuring confident preparation for the May 2026
OCR AS Level Chemistry B (Salters) Paper 1 and continued success in advanced chemistry
studies.
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 What is correct about atomic number?
A It is half the mass number for most elements.
B It is the number of neutrons in the nucleus.
C It determines the position of an element in the periodic table.
D It varies between isotopes of the same element.
Your answer [1]
2 Which of these is a tertiary alcohol?
A CH3CH(OH)CH3
B
OH
C H H H
H C C C OH
H H H
D OH
Your answer [1]
3 Which row has the homologous series named correctly?
Compound Homologous series
A CH3CHO ketone
B CH3NH2 amine
C CH3COOCH3 carboxylic acid
D CH3COCH3 aldehyde
Your answer [1]
© OCR 2025
, 3
4 Ethanol can be dehydrated.
C2H5OH C2H4 + H2O
What process describes this reaction?
A drying
B elimination
C oxidation
D reduction
Your answer [1]
5 A student is measuring the effect of temperature on the rate of reaction of hydrochloric acid with
calcium carbonate.
What is a variable that must be controlled?
A mass of calcium carbonate
B size of reacting flask
C temperature
D volume of CO2 produced
Your answer [1]
6 A substance has a high melting point and is soluble in water.
What is the structure type of the substance?
A covalent network
B ionic
C metallic
D simple molecular
Your answer [1]
© OCR 2025 Turn over
, 4
7 The Geiger and Marsden experiment was an important step in discovering the structure of the
atom.
What could be deduced from this experiment?
A Atoms consist of balancing positive and negative charges.
B Atoms have a small dense nucleus.
C The electrons in an atom are in energy levels.
D The nucleus contains neutrons.
Your answer [1]
8 What is correct about the emissions from petrol-fuelled cars?
A CO comes from the complete combustion of petrol.
B NOx is mainly made by the combustion of nitrogen compounds in petrol.
C SO2 is made by the combustion of sulfur compounds in petrol.
D No unburnt hydrocarbons are emitted.
Your answer [1]
9 How can benzene be described?
A A cycloalkene
B An alkane
C An alkene
D An arene
Your answer [1]
© OCR 2025
All Assessment Questions & Mark Scheme [OCR H033/01]
Exam Resource Summary
The AS Level Chemistry B (Salters) May 2025 Paper 1: Foundations of Chemistry (OCR
H033/01) – All Assessment Questions & Mark Scheme combines the full official examination
paper with its detailed mark scheme, providing a complete and structured resource for revision
and exam practice. This paper assesses students’ understanding of the fundamental concepts of
chemistry, including atomic structure, bonding, periodic trends, quantitative chemistry,
redox reactions, and organic foundations. It also evaluates practical and analytical skills
through data interpretation and problem-solving tasks that link theory to real-world chemical
contexts. The merged format aligns each question directly with its marking criteria, offering clear
insight into examiner expectations, mark allocation, and effective response strategies. This
resource is essential for focused revision, self-assessment, and the development of core
chemical understanding and analytical skills, ensuring confident preparation for the May 2026
OCR AS Level Chemistry B (Salters) Paper 1 and continued success in advanced chemistry
studies.
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 What is correct about atomic number?
A It is half the mass number for most elements.
B It is the number of neutrons in the nucleus.
C It determines the position of an element in the periodic table.
D It varies between isotopes of the same element.
Your answer [1]
2 Which of these is a tertiary alcohol?
A CH3CH(OH)CH3
B
OH
C H H H
H C C C OH
H H H
D OH
Your answer [1]
3 Which row has the homologous series named correctly?
Compound Homologous series
A CH3CHO ketone
B CH3NH2 amine
C CH3COOCH3 carboxylic acid
D CH3COCH3 aldehyde
Your answer [1]
© OCR 2025
, 3
4 Ethanol can be dehydrated.
C2H5OH C2H4 + H2O
What process describes this reaction?
A drying
B elimination
C oxidation
D reduction
Your answer [1]
5 A student is measuring the effect of temperature on the rate of reaction of hydrochloric acid with
calcium carbonate.
What is a variable that must be controlled?
A mass of calcium carbonate
B size of reacting flask
C temperature
D volume of CO2 produced
Your answer [1]
6 A substance has a high melting point and is soluble in water.
What is the structure type of the substance?
A covalent network
B ionic
C metallic
D simple molecular
Your answer [1]
© OCR 2025 Turn over
, 4
7 The Geiger and Marsden experiment was an important step in discovering the structure of the
atom.
What could be deduced from this experiment?
A Atoms consist of balancing positive and negative charges.
B Atoms have a small dense nucleus.
C The electrons in an atom are in energy levels.
D The nucleus contains neutrons.
Your answer [1]
8 What is correct about the emissions from petrol-fuelled cars?
A CO comes from the complete combustion of petrol.
B NOx is mainly made by the combustion of nitrogen compounds in petrol.
C SO2 is made by the combustion of sulfur compounds in petrol.
D No unburnt hydrocarbons are emitted.
Your answer [1]
9 How can benzene be described?
A A cycloalkene
B An alkane
C An alkene
D An arene
Your answer [1]
© OCR 2025
