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OCR MERGED QUESTION PAPER AND MARK SCHEME GCSE (9–1) Combined Science A(Gateway Science)J250/10 Chemistry (Higher Tier)FOR JUNE 2024 $12.19   Add to cart

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OCR MERGED QUESTION PAPER AND MARK SCHEME GCSE (9–1) Combined Science A(Gateway Science)J250/10 Chemistry (Higher Tier)FOR JUNE 2024

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OCR MERGED QUESTION PAPER AND MARK SCHEME GCSE (9–1) Combined Science A(Gateway Science)J250/10 Chemistry (Higher Tier)FOR JUNE 2024

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  • October 16, 2024
  • 39
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Graduation in computer science
  • Graduation in computer science
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williesmaish2999
Tuesday 11 June 2024 – Morning
GCSE (9–1) Combined Science A
(Gateway Science)
J250/10 Chemistry (Higher 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 Carbon reacts with copper oxide to produce copper.

copper oxide + carbon copper + carbon dioxide

What is the role of the carbon?

A It is a catalyst.

B It neutralises the copper oxide.

C It oxidises the copper oxide.

D It reduces the copper oxide.


Your answer [1]


2 A teacher investigates some reactions of chlorine.

Why is it important that the teacher does not breathe in chlorine?

A Chlorine is highly flammable.

B Chlorine is inert.

C Chlorine is strongly alkaline.

D Chlorine is toxic.


Your answer [1]


3 Where do scientists think that the oxygen in the Earth’s atmosphere came from?

A Earthquakes

B Green plants

C Thunderstorms

D Volcanic activity


Your answer [1]


© OCR 2024

, 3
4 Which of the catalysts is an example of an enzyme?

A Alumina – used in the cracking of hydrocarbons

B Copper – used in the reaction between zinc and dilute sulfuric acid

C Lipase – used to help humans absorb fats

D Manganese oxide – used in the decomposition of hydrogen peroxide


Your answer [1]



5 The graph shows the supply and demand of different fractions of crude oil.

Key:
Supply
Relative amount Demand
of fractions




Gases Petrol Paraffin Diesel Fuel oil

Which fractions are most likely to be cracked to make the supply match the demand?

A Diesel and fuel oil

B Gases and petrol

C Paraffin and fuel oil

D Petrol and diesel


Your answer [1]




© OCR 2024 Turn over

, 4
6 Acid rain is a dilute solution of a weak acid.

What is the pH of acid rain?

A 1–2

B 4–5

C 8–9

D 13–14


Your answer [1]


7 A student investigates the rate of reaction between marble chips and dilute hydrochloric acid.

The graph shows how the mass of the reactants changes during the reaction.

100




99




Mass (g) 98




97




96
0 100 200 300 400 500
Time (s)


What are the units for the rate of reaction?

A g

B g/s

C s

D s/g


Your answer [1]

© OCR 2024

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