OCR SUMMER 2026
PREDICTED PAPER
GCSE (9–1) Combined Science A
(Gateway Science)
J250/04 Chemistry ( Foundation Tier)
Time allowed: 1 hour 10 minutes
You must have:
• a ruler (cm/mm)
• the Data Sheet for GCSE (9–1) Combined Science
A (Chemistry) (inside this document)
You can use:
a scientific or graphical calculator
• an HB pencil
F
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 60.
• 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 15 pages.
ADVICE
• Read each question carefully before you start your answer.
Turn over
for more: tyrionpapers.com
, 2
Section A
You should spend a maximum of 20 minutes on this section.
Write your answer to each question in the box provided.
1. A student tests an unknown gas by holding a burning splint at the mouth of a test tube.
The splint produces a loud "pop" sound. What does this indicate?
A The gas is oxygen, as it relights the splint
B The gas is carbon dioxide, as it extinguishes the splint
C The gas is hydrogen, as it burns rapidly with oxygen to produce water
D The gas is chlorine, as it bleaches the splint
Your answer [1]
2. Chlorine is added to a solution of potassium iodide. Which of the following correctly
describes what happens and why?
A No reaction occurs because chlorine is less reactive than iodine
B Iodine is displaced and the solution turns brown, because chlorine is more reactive than
iodine
C Bromine is displaced and the solution turns orange, because chlorine is less reactive than
bromine
D Iodine displaces chlorine because iodine is a larger atom
Your answer [1]
for more: tyrionpapers.com
, 3
3.A student investigates the rate of reaction between calcium carbonate and hydrochloric acid
by measuring the loss in mass over time. Why is this method not suitable for measuring
the rate of a reaction that produces hydrogen gas?
A Hydrogen is too dangerous to use in the laboratory
B The loss in mass would be too small to measure accurately as hydrogen has a very low
relative formula mass
C Hydrogen cannot escape through the cotton wool plug
D The balance would be damaged by the hydrogen gas
Your answer [1]
4.A reversible reaction reaches dynamic equilibrium in a closed container. Which statement
best describes what is happening at equilibrium?
A The forward reaction has stopped completely and only the reverse reaction is occurring
B The concentrations of reactants and products are equal
C The rate of the forward reaction equals the rate of the backward reaction and concentrations
remain constant
D All reactants have been converted into products
Your answer [1]
5.Iron is extracted from its ore in a blast furnace. Which of the following correctly describes
the role of carbon monoxide in the blast furnace?
A It acts as an oxidising agent, adding oxygen to the iron oxide
B It acts as a reducing agent, removing oxygen from the iron oxide to produce iron
C It reacts with limestone to remove impurities from the furnace
D It provides the heat needed to melt the iron ore
Your answer [1]
for more: tyrionpapers.com
PREDICTED PAPER
GCSE (9–1) Combined Science A
(Gateway Science)
J250/04 Chemistry ( Foundation Tier)
Time allowed: 1 hour 10 minutes
You must have:
• a ruler (cm/mm)
• the Data Sheet for GCSE (9–1) Combined Science
A (Chemistry) (inside this document)
You can use:
a scientific or graphical calculator
• an HB pencil
F
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 60.
• 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 15 pages.
ADVICE
• Read each question carefully before you start your answer.
Turn over
for more: tyrionpapers.com
, 2
Section A
You should spend a maximum of 20 minutes on this section.
Write your answer to each question in the box provided.
1. A student tests an unknown gas by holding a burning splint at the mouth of a test tube.
The splint produces a loud "pop" sound. What does this indicate?
A The gas is oxygen, as it relights the splint
B The gas is carbon dioxide, as it extinguishes the splint
C The gas is hydrogen, as it burns rapidly with oxygen to produce water
D The gas is chlorine, as it bleaches the splint
Your answer [1]
2. Chlorine is added to a solution of potassium iodide. Which of the following correctly
describes what happens and why?
A No reaction occurs because chlorine is less reactive than iodine
B Iodine is displaced and the solution turns brown, because chlorine is more reactive than
iodine
C Bromine is displaced and the solution turns orange, because chlorine is less reactive than
bromine
D Iodine displaces chlorine because iodine is a larger atom
Your answer [1]
for more: tyrionpapers.com
, 3
3.A student investigates the rate of reaction between calcium carbonate and hydrochloric acid
by measuring the loss in mass over time. Why is this method not suitable for measuring
the rate of a reaction that produces hydrogen gas?
A Hydrogen is too dangerous to use in the laboratory
B The loss in mass would be too small to measure accurately as hydrogen has a very low
relative formula mass
C Hydrogen cannot escape through the cotton wool plug
D The balance would be damaged by the hydrogen gas
Your answer [1]
4.A reversible reaction reaches dynamic equilibrium in a closed container. Which statement
best describes what is happening at equilibrium?
A The forward reaction has stopped completely and only the reverse reaction is occurring
B The concentrations of reactants and products are equal
C The rate of the forward reaction equals the rate of the backward reaction and concentrations
remain constant
D All reactants have been converted into products
Your answer [1]
5.Iron is extracted from its ore in a blast furnace. Which of the following correctly describes
the role of carbon monoxide in the blast furnace?
A It acts as an oxidising agent, adding oxygen to the iron oxide
B It acts as a reducing agent, removing oxygen from the iron oxide to produce iron
C It reacts with limestone to remove impurities from the furnace
D It provides the heat needed to melt the iron ore
Your answer [1]
for more: tyrionpapers.com
