worked solutions
model answers
, Oxford Cambridge and RSA
Friday 13 June 2025 – Morning
GCSE (9–1) Chemistry B (Twenty First Century Science)
J258/04 Depth in Chemistry (Higher Tier)
Time allowed: 1 hour 45 minutes
H
You must have:
* 1 8 9 4 1 5 5 5 9 7 *
• a ruler (cm/mm)
• the Data Sheet for GCSE (9–1) Chemistry B
(inside this document)
You can use:
• a scientific or graphical calculator
• an HB pencil
* J 2 5 8 0 4 *
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 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 32 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 [601/8605/7] OCR is an exempt Charity
DC (SL/FC) 354030/3 Turn over
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BLANK PAGE
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, 3
1 Potassium, sodium and lithium are metals in Group 1 of the Periodic Table.
A student watches a video of the reaction of potassium with water.
Fig. 1.1 shows a diagram of the experiment.
Fig. 1.1
Water Potassium
The table shows information about this reaction.
Metal Products of the reaction Observations
Potassium Potassium hydroxide Potassium moves quickly on the surface of the
water and fizzes violently.
Hydrogen gas
Potassium burns with a pale purple flame.
(a) The student then watches a video of the reaction of sodium with water.
Predict the products of the reaction of sodium with water and describe the observations you
expect.
Products ................................................................. and .................................................................
Observations ....................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
[3]
© OCR 2025 Turn over
for more: tyrionpapers.com
model answers
, Oxford Cambridge and RSA
Friday 13 June 2025 – Morning
GCSE (9–1) Chemistry B (Twenty First Century Science)
J258/04 Depth in Chemistry (Higher Tier)
Time allowed: 1 hour 45 minutes
H
You must have:
* 1 8 9 4 1 5 5 5 9 7 *
• a ruler (cm/mm)
• the Data Sheet for GCSE (9–1) Chemistry B
(inside this document)
You can use:
• a scientific or graphical calculator
• an HB pencil
* J 2 5 8 0 4 *
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 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 32 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 [601/8605/7] OCR is an exempt Charity
DC (SL/FC) 354030/3 Turn over
for more: tyrionpapers.com
, 2
BLANK PAGE
DO NOT WRITE ON THIS PAGE
© OCR 2025
for more: tyrionpapers.com
, 3
1 Potassium, sodium and lithium are metals in Group 1 of the Periodic Table.
A student watches a video of the reaction of potassium with water.
Fig. 1.1 shows a diagram of the experiment.
Fig. 1.1
Water Potassium
The table shows information about this reaction.
Metal Products of the reaction Observations
Potassium Potassium hydroxide Potassium moves quickly on the surface of the
water and fizzes violently.
Hydrogen gas
Potassium burns with a pale purple flame.
(a) The student then watches a video of the reaction of sodium with water.
Predict the products of the reaction of sodium with water and describe the observations you
expect.
Products ................................................................. and .................................................................
Observations ....................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
[3]
© OCR 2025 Turn over
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