Oxford Cambridge and RSA
Friday 17 May 2024 – Morning
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)
• the Data Sheet for GCSE (9–1) Chemistry B
(inside this document)
H
You can use:
• an HB pencil
• a scientific or graphical calculator
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 24 pages.
ADVICE
• Read each question carefully before you start your answer.
OCR is an exempt Charity
Turn over
, 2
1 Fertilisers are used to increase the growth of plants.
They are added to soil to provide essential plant nutrient elements.
(a) Nitrogen is one essential plant nutrient element.
Name two other essential plant nutrient elements.
1 .......................................................................................................................................................
2 .......................................................................................................................................................
[2]
(b)
(i) State one disadvantage of the over-use of synthetic fertilisers.
..........................................................................................................................................................
. .................................................................................................................................................................... [1]
(ii) Suggest why farmers still use synthetic fertilisers despite their disadvantages.
..........................................................................................................................................................
. .................................................................................................................................................................... [1]
© OCR 2024
, 3
(c) An example of a synthetic fertiliser is ammonium nitrate, NH4NO3.
Ammonium nitrate is produced when ammonium hydroxide, NH4OH, reacts with nitric acid, HNO3.
NH4OH(aq) + HNO3(aq) NH4NO3(aq) + H2O(l)
The relative formula masses for the reactants and products are shown in the table.
NH4OH HNO3 NH4NO3 H2O
Relative formula mass 35.0 63.0 80.0 18.0
Calculate the atom economy for the formation of NH4NO3. Use the
equation:
mass of atoms in desired product
atom economy = × 100%
total mass of atoms in reactants
Give your answer to 1 decimal place.
Atom economy = ..................................................... % [4]
© OCR 2024 Turn over
, 4
2 Sodium chloride is an ionic compound.
(a) Fig. 2.1 shows three models of the arrangement of ions in sodium chloride.
Fig. 2.1
_
_ + _+ _
+ _ + _ + _ +
_ + _ + _
+ _ _ +
+ _ _ +
_ + _
+ _ +
+_ _+
+
Model A Model B Model C
(i) Describe the attraction between ions in sodium chloride.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
. .................................................................................................................................................................... [2]
(ii) Which two statements about the limitations of the models in Fig. 2.1 are true? Tick (
✓) two boxes.
Model A does not show the relative sizes of the ions.
Model C does not show the 3-D arrangement of ions.
None of the models show that sodium chloride is a compound containing two
elements.
Only one model shows that a chloride ion is an anion.
[2]
© OCR 2024
Friday 17 May 2024 – Morning
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)
• the Data Sheet for GCSE (9–1) Chemistry B
(inside this document)
H
You can use:
• an HB pencil
• a scientific or graphical calculator
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 24 pages.
ADVICE
• Read each question carefully before you start your answer.
OCR is an exempt Charity
Turn over
, 2
1 Fertilisers are used to increase the growth of plants.
They are added to soil to provide essential plant nutrient elements.
(a) Nitrogen is one essential plant nutrient element.
Name two other essential plant nutrient elements.
1 .......................................................................................................................................................
2 .......................................................................................................................................................
[2]
(b)
(i) State one disadvantage of the over-use of synthetic fertilisers.
..........................................................................................................................................................
. .................................................................................................................................................................... [1]
(ii) Suggest why farmers still use synthetic fertilisers despite their disadvantages.
..........................................................................................................................................................
. .................................................................................................................................................................... [1]
© OCR 2024
, 3
(c) An example of a synthetic fertiliser is ammonium nitrate, NH4NO3.
Ammonium nitrate is produced when ammonium hydroxide, NH4OH, reacts with nitric acid, HNO3.
NH4OH(aq) + HNO3(aq) NH4NO3(aq) + H2O(l)
The relative formula masses for the reactants and products are shown in the table.
NH4OH HNO3 NH4NO3 H2O
Relative formula mass 35.0 63.0 80.0 18.0
Calculate the atom economy for the formation of NH4NO3. Use the
equation:
mass of atoms in desired product
atom economy = × 100%
total mass of atoms in reactants
Give your answer to 1 decimal place.
Atom economy = ..................................................... % [4]
© OCR 2024 Turn over
, 4
2 Sodium chloride is an ionic compound.
(a) Fig. 2.1 shows three models of the arrangement of ions in sodium chloride.
Fig. 2.1
_
_ + _+ _
+ _ + _ + _ +
_ + _ + _
+ _ _ +
+ _ _ +
_ + _
+ _ +
+_ _+
+
Model A Model B Model C
(i) Describe the attraction between ions in sodium chloride.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
. .................................................................................................................................................................... [2]
(ii) Which two statements about the limitations of the models in Fig. 2.1 are true? Tick (
✓) two boxes.
Model A does not show the relative sizes of the ions.
Model C does not show the 3-D arrangement of ions.
None of the models show that sodium chloride is a compound containing two
elements.
Only one model shows that a chloride ion is an anion.
[2]
© OCR 2024
