Tuesday 11 June 2024 – Morning
GCSE (9–1) Combined Science A
(Gateway Science)
J250/04 Chemistry (Foundation Tier)
Time allowed: 1 hour 10 minutes
, 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 What is an effect of increased levels of carbon dioxide in the Earth’s atmosphere?
A Acid rain
B Global warming
C Light pollution
D Smog
Your answer [1]
2 What are catalysts found in biological systems called?
A Bacteria
B Enzymes
C Isotopes
D Vitamins
Your answer [1]
3 Burning fossil fuels can produce solids called particulates.
Which product of burning fossil fuels is an example of a particulate?
A Carbon
B Carbon monoxide
C Nitrogen dioxide
D Sulfur dioxide
Your answer [1]
© OCR 2024
, 3
4 The word equation shows how iron is extracted from iron oxide.
iron oxide + carbon iron + carbon dioxide
The table shows the masses of the reactants and products.
Iron oxide Carbon Iron Carbon dioxide
Mass (tonnes) 3200 360 1320
What is the mass of iron produced?
A 1880 tonnes
B 2240 tonnes
C 2840 tonnes
D 4880 tonnes
Your answer [1]
5 Scientists think the Earth’s oxygen-rich atmosphere developed due to photosynthesis by plants.
Which gas in the Earth’s early atmosphere did plants absorb during photosynthesis?
A Ammonia
B Carbon dioxide
C Methane
D Sulfur dioxide
Your answer [1]
© OCR 2024 Turn over
, 4
6 It is thought that the gases in Earth’s early atmosphere were released by volcanoes.
The table shows the amounts of different gases released by a volcano.
Which of the gases are carbon dioxide and water vapour?
Gas Percentage of gas
(%)
W 64
X 8
Y 2
Z 26
A W and Z
B W and Y
C X and Y
D X and Z
Your answer [1]
7 A student adds some metals to different solutions.
The table shows their results.
Metal Solution Reaction Key:
3 = reaction
Copper nickel sulfate 7
7 = no reaction
Nickel tin sulfate 3
Tin copper sulfate 3
What do the results tell the student about the reactivity of the three metals?
A All three metals have the same reactivity.
B Copper is the most reactive metal.
C Nickel is the most reactive metal.
D Tin is the most reactive metal.
Your answer [1]
© OCR 2024
GCSE (9–1) Combined Science A
(Gateway Science)
J250/04 Chemistry (Foundation Tier)
Time allowed: 1 hour 10 minutes
, 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 What is an effect of increased levels of carbon dioxide in the Earth’s atmosphere?
A Acid rain
B Global warming
C Light pollution
D Smog
Your answer [1]
2 What are catalysts found in biological systems called?
A Bacteria
B Enzymes
C Isotopes
D Vitamins
Your answer [1]
3 Burning fossil fuels can produce solids called particulates.
Which product of burning fossil fuels is an example of a particulate?
A Carbon
B Carbon monoxide
C Nitrogen dioxide
D Sulfur dioxide
Your answer [1]
© OCR 2024
, 3
4 The word equation shows how iron is extracted from iron oxide.
iron oxide + carbon iron + carbon dioxide
The table shows the masses of the reactants and products.
Iron oxide Carbon Iron Carbon dioxide
Mass (tonnes) 3200 360 1320
What is the mass of iron produced?
A 1880 tonnes
B 2240 tonnes
C 2840 tonnes
D 4880 tonnes
Your answer [1]
5 Scientists think the Earth’s oxygen-rich atmosphere developed due to photosynthesis by plants.
Which gas in the Earth’s early atmosphere did plants absorb during photosynthesis?
A Ammonia
B Carbon dioxide
C Methane
D Sulfur dioxide
Your answer [1]
© OCR 2024 Turn over
, 4
6 It is thought that the gases in Earth’s early atmosphere were released by volcanoes.
The table shows the amounts of different gases released by a volcano.
Which of the gases are carbon dioxide and water vapour?
Gas Percentage of gas
(%)
W 64
X 8
Y 2
Z 26
A W and Z
B W and Y
C X and Y
D X and Z
Your answer [1]
7 A student adds some metals to different solutions.
The table shows their results.
Metal Solution Reaction Key:
3 = reaction
Copper nickel sulfate 7
7 = no reaction
Nickel tin sulfate 3
Tin copper sulfate 3
What do the results tell the student about the reactivity of the three metals?
A All three metals have the same reactivity.
B Copper is the most reactive metal.
C Nickel is the most reactive metal.
D Tin is the most reactive metal.
Your answer [1]
© OCR 2024
