GCSE 2025
Chemistry A (Gateway Science)
J248/02: Paper 2 (Foundation tier)
*9986392288*
General Certificate of Secondary Education
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 page 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 24 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2024 [601/8663/X] DC (ST/CB) 335818/5
OCR is an exempt Charity
Turn over
Section A
You should spend a maximum of 30 minutes on this section.
Write your answer to each question in the box provided.
1 What is the test for oxygen gas?
A Burns with a lilac flame
B Burns with a squeaky pop
C Relights a glowing splint
D Turns limewater milky
, 2
Your answer
2 A student adds sodium hydroxide solution to copper sulfate solution.
What is the colour of the precipitate made?
A Blue
B Green
C Orange-brown
D White
Your answer
3 Which change would decrease the rate of a chemical reaction?
A Adding a catalyst
B Increasing the concentration of the solution
C Increasing the size of the solid pieces
D Increasing the temperature
Your answer
4 What is the major source of oxides of nitrogen in the atmosphere?
A Combustion of impurities in coal
B High temperature reactions in car engines
C Incomplete combustion of fossil fuels
D Industrial processes such as metal extraction
Your answer
5 How many different monomers (nucleotides) is DNA made from?
A 2
B 3
C 4
© OCR 2024
, 3
D 5
Your answer
6 What is the functional group in an alcohol molecule?
A –C–H
B –C=C–
C –COOH
D –O–H
Your answer
7 What is the balanced equation for the reaction of sodium with oxygen?
A Na + O
NaO
B Na + NaO O2 2
C 4Na + 2 O 2Na2O
D Na2 + 2O 2NaO
Your answer [1]
8 Which row describes the three halogens at room temperature?
Chlorine Bromine Iodine
A green gas orange-brown gas grey solid
B green gas orange-brown liquid grey solid
C green gas orange-brown liquid purple gas
D green liquid orange-brown liquid grey solid
Your answer
9 The table shows the results of the reactions between four metals and their metal
oxides.
Key: ✓ ✗ = no
= reaction
reactio
n
© OCR 2024 Turn over
, 4
Metal Metal Metal Metal
W X Y Z
oxide oxide oxide oxide
Metal
✗ ✗ ✗
W
Metal
✓ ✓ ✗
X
Metal
✓ ✗ ✗
Y
Metal
✓ ✓ ✓
Z
What is the correct order of reactivity of the metals, from the most reactive to the
least reactive?
A W, Y, X, Z
B W, Z, Y, X
C Z, X, Y, W
D Z, Y, X, W
Your answer
10 Two chemicals react together over time to make a cloudy precipitate.
What is the best method for determining the rate of reaction?
A Measure the loss in mass using a balance.
B Use a gas syringe.
C Use a pH meter.
D Use the disappearing cross experiment.
Your answer
11 Which polymer would be best for making a washing up bowl?
Maximum useable
Polymer Strength
temperature (°C)
A 38 high
B 85 low
C 110 high
D 160 low
© OCR 2024
Chemistry A (Gateway Science)
J248/02: Paper 2 (Foundation tier)
*9986392288*
General Certificate of Secondary Education
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 page 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 24 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2024 [601/8663/X] DC (ST/CB) 335818/5
OCR is an exempt Charity
Turn over
Section A
You should spend a maximum of 30 minutes on this section.
Write your answer to each question in the box provided.
1 What is the test for oxygen gas?
A Burns with a lilac flame
B Burns with a squeaky pop
C Relights a glowing splint
D Turns limewater milky
, 2
Your answer
2 A student adds sodium hydroxide solution to copper sulfate solution.
What is the colour of the precipitate made?
A Blue
B Green
C Orange-brown
D White
Your answer
3 Which change would decrease the rate of a chemical reaction?
A Adding a catalyst
B Increasing the concentration of the solution
C Increasing the size of the solid pieces
D Increasing the temperature
Your answer
4 What is the major source of oxides of nitrogen in the atmosphere?
A Combustion of impurities in coal
B High temperature reactions in car engines
C Incomplete combustion of fossil fuels
D Industrial processes such as metal extraction
Your answer
5 How many different monomers (nucleotides) is DNA made from?
A 2
B 3
C 4
© OCR 2024
, 3
D 5
Your answer
6 What is the functional group in an alcohol molecule?
A –C–H
B –C=C–
C –COOH
D –O–H
Your answer
7 What is the balanced equation for the reaction of sodium with oxygen?
A Na + O
NaO
B Na + NaO O2 2
C 4Na + 2 O 2Na2O
D Na2 + 2O 2NaO
Your answer [1]
8 Which row describes the three halogens at room temperature?
Chlorine Bromine Iodine
A green gas orange-brown gas grey solid
B green gas orange-brown liquid grey solid
C green gas orange-brown liquid purple gas
D green liquid orange-brown liquid grey solid
Your answer
9 The table shows the results of the reactions between four metals and their metal
oxides.
Key: ✓ ✗ = no
= reaction
reactio
n
© OCR 2024 Turn over
, 4
Metal Metal Metal Metal
W X Y Z
oxide oxide oxide oxide
Metal
✗ ✗ ✗
W
Metal
✓ ✓ ✗
X
Metal
✓ ✗ ✗
Y
Metal
✓ ✓ ✓
Z
What is the correct order of reactivity of the metals, from the most reactive to the
least reactive?
A W, Y, X, Z
B W, Z, Y, X
C Z, X, Y, W
D Z, Y, X, W
Your answer
10 Two chemicals react together over time to make a cloudy precipitate.
What is the best method for determining the rate of reaction?
A Measure the loss in mass using a balance.
B Use a gas syringe.
C Use a pH meter.
D Use the disappearing cross experiment.
Your answer
11 Which polymer would be best for making a washing up bowl?
Maximum useable
Polymer Strength
temperature (°C)
A 38 high
B 85 low
C 110 high
D 160 low
© OCR 2024
