2025 OCR AS Level Chemistry B (Salters) H033/01 Foundations of Chemistry | Question Paper with Marking Scheme Attached | Verified

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2025 OCR AS Level Chemistry B (Salters)
H033/01 Foundations of chemistry
Verified Question paper with Marking Scheme Attached



Oxford Cambridge and RSA

Tuesday 13 May 2025 – Morning
AS Level Chemistry B (Salters)
H033/01 Foundations of chemistry
Time allowed: 1 hour 30 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 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



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1 OCR A/AS Page 1

,uestion
S Level Paper
question
OCR with
A/AS=2025
paper,
Exam-Ready
including
OCR ASExaminer
theLevel
complete
Chemistry
MarkQuestion
Scheme.
B (Salters)
Paper
Coverswith
H03301
all Exam-Ready
examinable
Foundations
content
Examiner
of chemistry
withMark
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Scheme.
Verified
Answers2025
Question
Covers all
OCR
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examinable
AS
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H03301 Founda


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


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,uestion
S Level Paper
question
OCR with
A/AS=2025
paper,
Exam-Ready
including
OCR ASExaminer
theLevel
complete
Chemistry
MarkQuestion
Scheme.
B (Salters)
Paper
Coverswith
H03301
all Exam-Ready
examinable
Foundations
content
Examiner
of chemistry
withMark
Verified
Scheme.
Verified
Answers2025
Question
Covers all
OCR
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H03301 Founda


3
Your answer [1]




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,uestion
S Level Paper
question
OCR with
A/AS=2025
paper,
Exam-Ready
including
OCR ASExaminer
theLevel
complete
Chemistry
MarkQuestion
Scheme.
B (Salters)
Paper
Coverswith
H03301
all Exam-Ready
examinable
Foundations
content
Examiner
of chemistry
withMark
Verified
Scheme.
Verified
Answers2025
Question
Covers all
OCR
paper
examinable
AS
with
Level
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content
Chemistry
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withBVerified
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Attached.pdf
Answers
H03301 Founda


4
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]




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