Oxford Cambridge and RSA
Monday 22 May 2023 – Morning
GCSE (9–1) Chemistry A (Gateway Science)
J248/01 Paper 1 (Foundation Tier)
Time allowed: 1
... [Show More] hour 45 minutes
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 the answer is wrong.
INFORMATION
• The total mark for this paper is 90.
• 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 2023 [601/8663/X]
DC (PQ/SG) 328740/5
OCR is an exempt Charity
Turn over
You must have:
• a ruler (cm/mm)
• the Data Sheet for GCSE (9–1) Chemistry A (inside
this document)
You can use:
• a scientific or graphical calculator
• an HB pencil
2
© OCR 2023
Section A
You should spend a maximum of 30 minutes on this section.
Write your answer to each question in the box provided.
1 Where is most of the mass found in an atom?
A Electrons
B Neutrons
C Nucleus
D Protons
Your answer [1]
2 Sodium fluoride has the formula NaF. The formula of the sodium ion is Na+
.
What is the formula of the fluoride ion?
A F
+
B F
–
C F
2+
D F
2–
Your answer [1]
3 Which row of results shows that the pH of a solution is acidic?
pH Universal indicator colour
A 3 orange
B 10 blue
C 3 blue
D 10 orange
Your answer [1]
3
© OCR 2023 Turn over
C
B
A
D
4 Thomson discovered the first sub-atomic particle.
Which sub-atomic particle did Thomson discover?
A Atom
B Electron
C Neutron
D Proton
Your answer [1]
5 What is the relative formula mass of iron chloride, FeCl 3?
Relative atomic mass (Ar
): Cl = 35.5 Fe = 55.8.
A 91.3
B 126.8
C 162.3
D 202.9
Your answer [1]
6 An element gains electrons to form a full outer shell.
Which part of the Periodic Table will the element be from?
Your answer [1]
4
© OCR 2023
7 Why can the mass of a reaction in an open conical flask decrease?
A One of the products is a gas.
B One of the products is a solid.
C One of the reactants is a liquid.
D One of the reactants is a solid.
Your answer [1]
8 When the model of the atom was developed, scientists reviewed the work of other scientists.
Why is it important for scientists to review each other’s work?
A They will copy the experiments to complete the research first.
B They will evaluate the data and suggest improvements.
C They will make sure that personal protective equipment is worn.
D They will start an argument about who is correct. [Show Less]