Cambridge IGCSE™
* 9 4 2 5 8 4 4 6 0 9 *
CHEMISTRY 0620/42
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/SG) 365994/3
© UCLES 2025 [Turn over
, 2
BLANK PAGE
© UCLES 2025 0620/42/M/J/25
, 3
1 Using numbers only, state the:
(a) percentage of nitrogen in clean, dry air
............................................................................................................................................. [1]
(b) typical operating temperature of the Contact process in °C
............................................................................................................................................. [1]
(c) number of metals in Period 3 of the Periodic Table
............................................................................................................................................. [1]
(d) number of halogens which are gases at r.t.p.
............................................................................................................................................. [1]
(e) typical temperature for the fermentation of aqueous glucose in °C
............................................................................................................................................. [1]
(f) number of unbranched structural isomers of C4H8 which decolourise aqueous bromine
............................................................................................................................................. [1]
(g) number of covalent bonds in one molecule of ethanol
............................................................................................................................................. [1]
(h) number of carbon atoms in one molecule of propyl butanoate.
............................................................................................................................................. [1]
[Total: 8]
© UCLES 2025 0620/42/M/J/25 [Turn over
* 9 4 2 5 8 4 4 6 0 9 *
CHEMISTRY 0620/42
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/SG) 365994/3
© UCLES 2025 [Turn over
, 2
BLANK PAGE
© UCLES 2025 0620/42/M/J/25
, 3
1 Using numbers only, state the:
(a) percentage of nitrogen in clean, dry air
............................................................................................................................................. [1]
(b) typical operating temperature of the Contact process in °C
............................................................................................................................................. [1]
(c) number of metals in Period 3 of the Periodic Table
............................................................................................................................................. [1]
(d) number of halogens which are gases at r.t.p.
............................................................................................................................................. [1]
(e) typical temperature for the fermentation of aqueous glucose in °C
............................................................................................................................................. [1]
(f) number of unbranched structural isomers of C4H8 which decolourise aqueous bromine
............................................................................................................................................. [1]
(g) number of covalent bonds in one molecule of ethanol
............................................................................................................................................. [1]
(h) number of carbon atoms in one molecule of propyl butanoate.
............................................................................................................................................. [1]
[Total: 8]
© UCLES 2025 0620/42/M/J/25 [Turn over
