Friday 13 June 2025 – Morning
GCSE (9–1) Chemistry B (Twenty First Century Science)
J258/02 Depth in Chemistry (Foundation Tier)
Time allowed: 1 hour 45 minutes
You must have:
• a ruler (cm/mm)
• the Data Sheet for GCSE (9 –1) Chemistry B
(inside this document)
You can use:
F
• 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)
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 28 pages.
ADVICE
• Read each question carefully before you start your answer.
OCR GCSE Chemistry B (Twenty First Century Science)
(J258/02) Depth in Chemistry (Foundation Tier) Question Paper and
Mark Scheme summer 2025
, 2
1 Fig. 1.1 shows the names and formulae of some acids and alkalis.
Fig. 1.1
Name of compound Formula
Hydrochloric acid HCl
Acids
Sulfuric acid H2SO4
Lithium hydroxide LiOH
Alkalis Sodium hydroxide NaOH
Potassium hydroxide KOH
(a) Write down the name of a compound from Fig. 1.1 to answer the following questions.
(i) Which compound has a formula with 2 atoms?
. ................................................................................................................................................. [1]
(ii) Which alkali reacts with hydrochloric acid to make sodium chloride?
. ................................................................................................................................................. [1]
(iii) Which alkali has the highest relative formula mass?
Use the Periodic Table to help you.
. ................................................................................................................................................. [1]
(iv) Which two compounds can each react with magnesium metal to make hydrogen?
....................................................................... and ..................................................................... [1]
(v) Which compound gives a white precipitate when a few drops are added to dilute barium nitrate?
. ................................................................................................................................................. [1]
(b) Which statements are true and which are false?
Tick (✓) one box in each row.
True False
Acids form hydrogen ions when they dissolve in water.
All neutralisation reactions make water.
Copper does not react with dilute acid.
Titrations give qualitative data.
[3]
© OCR 2025
, 3
(c) A student does a titration to find out how much acid is needed to neutralise 25.0 cm3 aqueous
sodium hydroxide.
They add the aqueous sodium hydroxide to a conical flask.
Aqueous sodium hydroxide
(i) The student adds another substance to the conical flask so that they know when the aqueous
sodium hydroxide is neutralised.
Name this substance.
Describe how the substance shows the student that the aqueous sodium hydroxide has been
neutralised.
Name ................................................................................................................................................
Description .......................................................................................................................................
..........................................................................................................................................................
[2]
(ii) Which other piece of apparatus does the student need to do the titration?
Tick (✓) one box.
Bunsen burner
Burette
Stop clock
Test-tube
Thermometer
[1]
(iii) The student does the titration and then looks at the results of another student.
Explain why the student looks at the results of another student.
..........................................................................................................................................................
. ................................................................................................................................................. [1]
© OCR 2025 Turn over
, 4
2 Several processes can be used to produce drinking water.
Each process has a purpose.
(a) Draw lines to connect each water treatment process with its correct purpose.
Water treatment process Purpose
Aeration Separates pure water from salt water.
Distillation Uses oxygen to break down harmful waste.
Filtration Removes solid impurities.
[2]
(b) Water for drinking is treated with chlorine.
What is the test and expected result for chlorine gas?
Tick (✓) one box in each column.
Test Expected result
Aqueous bromine goes blue
Damp blue litmus paper goes green
Lighted splint goes red then white
[2]
© OCR 2025
GCSE (9–1) Chemistry B (Twenty First Century Science)
J258/02 Depth in Chemistry (Foundation Tier)
Time allowed: 1 hour 45 minutes
You must have:
• a ruler (cm/mm)
• the Data Sheet for GCSE (9 –1) Chemistry B
(inside this document)
You can use:
F
• 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)
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 28 pages.
ADVICE
• Read each question carefully before you start your answer.
OCR GCSE Chemistry B (Twenty First Century Science)
(J258/02) Depth in Chemistry (Foundation Tier) Question Paper and
Mark Scheme summer 2025
, 2
1 Fig. 1.1 shows the names and formulae of some acids and alkalis.
Fig. 1.1
Name of compound Formula
Hydrochloric acid HCl
Acids
Sulfuric acid H2SO4
Lithium hydroxide LiOH
Alkalis Sodium hydroxide NaOH
Potassium hydroxide KOH
(a) Write down the name of a compound from Fig. 1.1 to answer the following questions.
(i) Which compound has a formula with 2 atoms?
. ................................................................................................................................................. [1]
(ii) Which alkali reacts with hydrochloric acid to make sodium chloride?
. ................................................................................................................................................. [1]
(iii) Which alkali has the highest relative formula mass?
Use the Periodic Table to help you.
. ................................................................................................................................................. [1]
(iv) Which two compounds can each react with magnesium metal to make hydrogen?
....................................................................... and ..................................................................... [1]
(v) Which compound gives a white precipitate when a few drops are added to dilute barium nitrate?
. ................................................................................................................................................. [1]
(b) Which statements are true and which are false?
Tick (✓) one box in each row.
True False
Acids form hydrogen ions when they dissolve in water.
All neutralisation reactions make water.
Copper does not react with dilute acid.
Titrations give qualitative data.
[3]
© OCR 2025
, 3
(c) A student does a titration to find out how much acid is needed to neutralise 25.0 cm3 aqueous
sodium hydroxide.
They add the aqueous sodium hydroxide to a conical flask.
Aqueous sodium hydroxide
(i) The student adds another substance to the conical flask so that they know when the aqueous
sodium hydroxide is neutralised.
Name this substance.
Describe how the substance shows the student that the aqueous sodium hydroxide has been
neutralised.
Name ................................................................................................................................................
Description .......................................................................................................................................
..........................................................................................................................................................
[2]
(ii) Which other piece of apparatus does the student need to do the titration?
Tick (✓) one box.
Bunsen burner
Burette
Stop clock
Test-tube
Thermometer
[1]
(iii) The student does the titration and then looks at the results of another student.
Explain why the student looks at the results of another student.
..........................................................................................................................................................
. ................................................................................................................................................. [1]
© OCR 2025 Turn over
, 4
2 Several processes can be used to produce drinking water.
Each process has a purpose.
(a) Draw lines to connect each water treatment process with its correct purpose.
Water treatment process Purpose
Aeration Separates pure water from salt water.
Distillation Uses oxygen to break down harmful waste.
Filtration Removes solid impurities.
[2]
(b) Water for drinking is treated with chlorine.
What is the test and expected result for chlorine gas?
Tick (✓) one box in each column.
Test Expected result
Aqueous bromine goes blue
Damp blue litmus paper goes green
Lighted splint goes red then white
[2]
© OCR 2025
