OCR SUMMER 2026
PREDICTED PAPER
GCSE (9–1) Chemistry B (Twenty First Century Science)
J258/03 Breadth in Chemistry (Higher Tier)
Time allowed: 1 hour 45 minutes
You must have:
• a ruler (cm/mm)
H
• the Data Sheet for GCSE (9–1) Chemistry B (inside
this document)
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 90.
• The marks for each question are shown in brackets [ ].
• This document has 23 pages.
ADVICE
• Read each question carefully before you start your answer.
Turn over
for more: tyrionpapers.com
, 2
1. A farmer carried out a trial to investigate the effect of different fertiliser treatments on
crop yield and the impact on a nearby river. The results are shown in the table below.
Field Fertiliser treatment Fertiliser applied (kg Crop yield River nitrate
per hectare) (tonnes/ha) level (mg/L)
1 None (control) 0 3.1 2.4
2 Ammonium 150 6.8 8.7
phosphate
3 Potassium nitrate 150 7.2 14.3
(a) Phosphorus and potassium are two essential plant nutrient elements.
Using the data in the table, suggest which field used a fertiliser that supplies both
phosphorus and potassium to the soil.
Give a reason for your answer.
Field: ...........................................................................................................................
Reason: .....................................................................................................................
...................................................................................................................................
...................................................................................................................................
...................................................................................................................................
................................................................................................................................... [2]
(b) The data shows that field 3 has a higher river nitrate level than field 2, even though the
same mass of fertiliser was applied.
Suggest two reasons why over-use of nitrate-based fertilisers is harmful to aquatic
ecosystems.
1.................................................................................................................................
...................................................................................................................................
2. ...............................................................................................................................
................................................................................................................................... [2]
for more: tyrionpapers.com
, 3
(c) Ammonium phosphate, (NH4)3PO4, is a synthetic fertiliser.
It is produced by reacting ammonia, NH3, with phosphoric acid, H3PO4:
3NH3(aq) + H3PO4(aq) → (NH43PO4(aq)
The relative formula masses are shown in the table.
NH₃ H₃PO₄ (NH₄)₃PO₄
Relative formula mass 17.0 98.0 149.0
Calculate the atom economy for the production of (NH43PO4.
Use the equation:
𝐦𝐚𝐬𝐬 𝐨𝐟 𝐚𝐭𝐨𝐦𝐬 𝐢𝐧 𝐝𝐞𝐬𝐢𝐫𝐞𝐝 𝐩𝐫𝐨𝐝𝐮𝐜𝐭
atom economy = × 100%
𝐦𝐚𝐬𝐬 𝐨𝐟 𝐚𝐭𝐨𝐦𝐬 𝐢𝐧 𝐝𝐞𝐬𝐢𝐫𝐞𝐝 𝐩𝐫𝐨𝐝𝐮𝐜𝐭
Give your answer to 1 decimal place.
Atom economy = .................................... % [4]
(d) The farmer considers switching from synthetic fertilisers to organic fertilisers such
as manure.
Suggest one advantage and one disadvantage of using manure instead of synthetic
fertilisers.
Advantage: ...............................................................................................................
...................................................................................................................................
Disadvantage: ............................................................................................................
................................................................................................................................... [2]
for more: tyrionpapers.com
PREDICTED PAPER
GCSE (9–1) Chemistry B (Twenty First Century Science)
J258/03 Breadth in Chemistry (Higher Tier)
Time allowed: 1 hour 45 minutes
You must have:
• a ruler (cm/mm)
H
• the Data Sheet for GCSE (9–1) Chemistry B (inside
this document)
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 90.
• The marks for each question are shown in brackets [ ].
• This document has 23 pages.
ADVICE
• Read each question carefully before you start your answer.
Turn over
for more: tyrionpapers.com
, 2
1. A farmer carried out a trial to investigate the effect of different fertiliser treatments on
crop yield and the impact on a nearby river. The results are shown in the table below.
Field Fertiliser treatment Fertiliser applied (kg Crop yield River nitrate
per hectare) (tonnes/ha) level (mg/L)
1 None (control) 0 3.1 2.4
2 Ammonium 150 6.8 8.7
phosphate
3 Potassium nitrate 150 7.2 14.3
(a) Phosphorus and potassium are two essential plant nutrient elements.
Using the data in the table, suggest which field used a fertiliser that supplies both
phosphorus and potassium to the soil.
Give a reason for your answer.
Field: ...........................................................................................................................
Reason: .....................................................................................................................
...................................................................................................................................
...................................................................................................................................
...................................................................................................................................
................................................................................................................................... [2]
(b) The data shows that field 3 has a higher river nitrate level than field 2, even though the
same mass of fertiliser was applied.
Suggest two reasons why over-use of nitrate-based fertilisers is harmful to aquatic
ecosystems.
1.................................................................................................................................
...................................................................................................................................
2. ...............................................................................................................................
................................................................................................................................... [2]
for more: tyrionpapers.com
, 3
(c) Ammonium phosphate, (NH4)3PO4, is a synthetic fertiliser.
It is produced by reacting ammonia, NH3, with phosphoric acid, H3PO4:
3NH3(aq) + H3PO4(aq) → (NH43PO4(aq)
The relative formula masses are shown in the table.
NH₃ H₃PO₄ (NH₄)₃PO₄
Relative formula mass 17.0 98.0 149.0
Calculate the atom economy for the production of (NH43PO4.
Use the equation:
𝐦𝐚𝐬𝐬 𝐨𝐟 𝐚𝐭𝐨𝐦𝐬 𝐢𝐧 𝐝𝐞𝐬𝐢𝐫𝐞𝐝 𝐩𝐫𝐨𝐝𝐮𝐜𝐭
atom economy = × 100%
𝐦𝐚𝐬𝐬 𝐨𝐟 𝐚𝐭𝐨𝐦𝐬 𝐢𝐧 𝐝𝐞𝐬𝐢𝐫𝐞𝐝 𝐩𝐫𝐨𝐝𝐮𝐜𝐭
Give your answer to 1 decimal place.
Atom economy = .................................... % [4]
(d) The farmer considers switching from synthetic fertilisers to organic fertilisers such
as manure.
Suggest one advantage and one disadvantage of using manure instead of synthetic
fertilisers.
Advantage: ...............................................................................................................
...................................................................................................................................
Disadvantage: ............................................................................................................
................................................................................................................................... [2]
for more: tyrionpapers.com
