OCR GCSE 9-1 CHEMISTRY B J258/03 BREADTH IN
CHEMISTRY HIGH TIER 2025 ACTUAL PAPER MERGED
WITH MARK SCHEME
OCR GCSE 9-1 CHEMISTRY B J258/03 BREADTH IN CHEMISTRY HIGH TIER
2025 ACTUAL PAPER MERGED WITH MARK SCHEME
[DATE]
[Company address]
, 1
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 28 pages.
*1894809773*
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 [601/8605/7] DC (IP/FC) 362110/8
OCR is an exempt Charity
Turn over
1 A student investigates rate of reaction.
(a) The student does three experiments adding limestone to dilute hydrochloric acid.
In all three experiments, the student keeps these the same:
• the mass of limestone
• the volume of acid
• the concentration of acid.
In experiment 1 the student adds one large piece of limestone to the acid at 20 °C.
The student measures the volume of gas produced every 30 seconds.
Fig. 1.1 shows the results of
experiment 1. Fig. 1.1
50
40
Volume of gas 30
produced (cm3)
20
10
0
0 60 120 180 240 300 360 420 480 540 600
Time (s)
Calculate the rate of reaction during the first 120 seconds.
Use Fig. 1.1.
© OCR 2025
, 2
Give your answer to 2 decimal places.
Rate of reaction = .............................................. cm3 / s [3] (b) Table 1.1 shows the
conditions used for all three experiments.
Table 1.1
Type of limestone Temperature (°C)
Experiment 1 Large piece 20
Experiment 2 Large piece 40
Experiment 3 Powder 40
(i) Draw a line on Fig. 1.1 to show the expected results for experiment 2.
Use the information in Table 1.1 to help you.
(ii) Experiment 3 is the fastest.
Explain why.
Use the information in Table 1.1.
Include ideas about collisions in your answer.
...............................................................................................................................................
........... ...................................................................................................................................
.......................
...............................................................................................................................................
...........
...............................................................................................................................................
...... [2]
(c) A scientist investigates the effect of four metals, A, B, C and D, on the rate of reaction
to make ethane.
The scientist uses 5.0 g of each metal.
Table 1.2 shows their results.
Table 1.2
Metal Mass of metal at end Time taken to make
© OCR 2025 Turn over
, 3
of reaction (g) 10 g of ethane (s)
A 2.5 25
B 0.0 30
C 5.0 40
D 5.0 25
(i) Which metal A, B, C or D is the best metal to use as a catalyst in this reaction?
Explain your reasoning.
Use the information in Table 1.2.
Metal .....................................
Explanation ....................................................................................................................
..................
........................................................................................................................................
..................
........................................................................................................................................
..................
(ii) Which statements about catalysts are true and which are false?
Tick (✓) one box in each row.
True False
A catalyst changes the overall energy change for a reaction.
A catalyst lowers the activation energy of a reaction.
A catalyst provides an alternative route for a reaction.
[2] BLANK PAGE
© OCR 2025
CHEMISTRY HIGH TIER 2025 ACTUAL PAPER MERGED
WITH MARK SCHEME
OCR GCSE 9-1 CHEMISTRY B J258/03 BREADTH IN CHEMISTRY HIGH TIER
2025 ACTUAL PAPER MERGED WITH MARK SCHEME
[DATE]
[Company address]
, 1
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 28 pages.
*1894809773*
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 [601/8605/7] DC (IP/FC) 362110/8
OCR is an exempt Charity
Turn over
1 A student investigates rate of reaction.
(a) The student does three experiments adding limestone to dilute hydrochloric acid.
In all three experiments, the student keeps these the same:
• the mass of limestone
• the volume of acid
• the concentration of acid.
In experiment 1 the student adds one large piece of limestone to the acid at 20 °C.
The student measures the volume of gas produced every 30 seconds.
Fig. 1.1 shows the results of
experiment 1. Fig. 1.1
50
40
Volume of gas 30
produced (cm3)
20
10
0
0 60 120 180 240 300 360 420 480 540 600
Time (s)
Calculate the rate of reaction during the first 120 seconds.
Use Fig. 1.1.
© OCR 2025
, 2
Give your answer to 2 decimal places.
Rate of reaction = .............................................. cm3 / s [3] (b) Table 1.1 shows the
conditions used for all three experiments.
Table 1.1
Type of limestone Temperature (°C)
Experiment 1 Large piece 20
Experiment 2 Large piece 40
Experiment 3 Powder 40
(i) Draw a line on Fig. 1.1 to show the expected results for experiment 2.
Use the information in Table 1.1 to help you.
(ii) Experiment 3 is the fastest.
Explain why.
Use the information in Table 1.1.
Include ideas about collisions in your answer.
...............................................................................................................................................
........... ...................................................................................................................................
.......................
...............................................................................................................................................
...........
...............................................................................................................................................
...... [2]
(c) A scientist investigates the effect of four metals, A, B, C and D, on the rate of reaction
to make ethane.
The scientist uses 5.0 g of each metal.
Table 1.2 shows their results.
Table 1.2
Metal Mass of metal at end Time taken to make
© OCR 2025 Turn over
, 3
of reaction (g) 10 g of ethane (s)
A 2.5 25
B 0.0 30
C 5.0 40
D 5.0 25
(i) Which metal A, B, C or D is the best metal to use as a catalyst in this reaction?
Explain your reasoning.
Use the information in Table 1.2.
Metal .....................................
Explanation ....................................................................................................................
..................
........................................................................................................................................
..................
........................................................................................................................................
..................
(ii) Which statements about catalysts are true and which are false?
Tick (✓) one box in each row.
True False
A catalyst changes the overall energy change for a reaction.
A catalyst lowers the activation energy of a reaction.
A catalyst provides an alternative route for a reaction.
[2] BLANK PAGE
© OCR 2025
