Recent Past Papers (Notes coming soon!)

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Cambridge IGCSE™

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CHEMISTRY 0620/43
Paper 4 Theory (Extended) May/June 2025

1 hour 15 minutes

You must answer on the question paper.

No additional materials are needed.

INSTRUCTIONS
● Answer all questions.
● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs.
● Write your name, centre number and candidate number in the boxes at the top of the page.
● Write your answer to each question in the space provided.
● Do not use an erasable pen or correction fluid.
● Do not write on any bar codes.
● You may use a calculator.
● You should show all your working and use appropriate units.


INFORMATION
● The total mark for this paper is 80.
● The number of marks for each question or part question is shown in brackets [ ].
● The Periodic Table is printed in the question paper.




This document has 16 pages. Any blank pages are indicated.


DC (WW/CT) 342089/4
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, © UCLES 2025
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1 A list of substances is shown.

aluminium oxide calcium oxide chlorine ethanol graphite

nitrogen oxygen propane propene silicon(IV) oxide

Answer the questions using the list of substances.

Each substance may be used once, more than once, or not at all.

State which of the substances:
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(a) is a compound with a giant covalent structure

............................................................................................................................................. [1]

(b) is an unsaturated hydrocarbon

............................................................................................................................................. [1]

(c) is an amphoteric oxide

............................................................................................................................................. [1]
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(d) is a good conductor of electricity when solid

............................................................................................................................................. [1]

(e) contains simple molecules with 9 atoms

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(f) react together to form slag in the blast furnace

................................................................... and .................................................................. [2]
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(g) belongs to a homologous series whose general formula is CnH2n+2

............................................................................................................................................. [1]

(h) is manufactured by the catalytic addition of steam to ethene

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(i) is a gas that is approximately 78% of clean, dry air.

............................................................................................................................................. [1]

[Total: 10]
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0620/43/M/J/25 [Turn over