GCE Chemistry
BH433/01:
Fundamentals of
chemistry A Level
OXFORD
CAMBRIDGE
AND RSA
2024
OCR 2024
, Oxford Cambridge and RSA
Monday 10 June 2024 – 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 pages 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 36 pages.
ADVICE
• Read each question carefully before you start your answer.
OCR is an exempt Charity
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 An isotope of an element has a mass number of 25.
What is correct for an atom of this isotope?
A It has 12 neutrons. B
It has 25 electrons. C It
has 25 protons.
D The sum of its protons and neutrons is 25.
Your answer [1]
2 What is correct about s orbitals?
A Only elements in Group 1 or Group 2 have them.
B They always contain 2 electrons.
C They are spherical in shape.
D They can contain up to 6 electrons.
Your answer [1]
3 Which species have an electron configuration ending in s1?
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