Oxford Cambridge and RSA
Monday 22 May 2023 – Morning
GCSE (9–1) Chemistry A (Gateway Science)
J248/03 Paper 3 (Higher Tier)
Time allowed: 1 hour
... [Show More] 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) 328741/4
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 Which term is a correct description of ice turning from a solid to a liquid?
A Chemical change
B Evaporation
C Freezing
D Physical change
Your answer [1]
2 Which equipment is needed for distillation?
A Condenser, funnel, thermometer
B Condenser, round-bottomed flask, thermometer
C Thermometer, beaker, pH probe
D Thermometer, measuring cylinder, filter paper
Your answer [1]
3 A carbon nanotube is 1.4 × 10–9m wide. A human hair is 1.4 × 10–4m wide.
How many times wider is the hair compared to the nanotube?
A 100
B 1000
C 10000
D 100000
Your answer [1]
3
© OCR 2023 Turn over
C
B
A
D
4 An element reacts with oxygen to form an acidic oxide.
Which area of the Periodic Table is the element from?
Your answer [1]
5 The diagram shows a 3D space filling model of methane.
What are the limitations of showing methane as a 3D space filling model?
A It does not show how close together the atoms are.
B It does not show how many electrons are in a bond.
C It does not show the relative size of the atoms.
D It does not show the relative volume that the atoms take up.
Your answer [1]
4
© OCR 2023
4
6 Which fraction is collected at the top of the fractional distillation column?
Melting point range
(°C)
Boiling point range
(°C)
A –70 – –60 20 – 25
B –50 – –40 30 – 50
C 0 – 20 100 – 120
D 20 – 40 130 – 160
Your answer [1]
7 How many moles are in 30g of nitrogen, N2
?
Relative atomic mass (Ar
): N = 14.0
A 0.47mol
B 0.93mol
C 1.07mol
D 2.14mol
Your answer [1]
8 Calcium phosphate contains the ions Ca2+ and PO 3–
.
What is the formula for calcium phosphate?
A CaPO4
B Ca2PO4
C Ca2
(PO4
)
3
D Ca3
(PO4
) [Show Less]