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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
© UCLES 2025 [Turn over
, © UCLES 2025
,
* 0000800000002 *
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2
0620/43/M/J/25
BLANK PAGE
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, * 0000800000003 *
DO NOT WRITE IN THIS MARGIN
3
, ,
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:
DO NOT WRITE IN THIS MARGIN
(a) is a compound with a giant covalent structure
............................................................................................................................................. [1]
(b) is an unsaturated hydrocarbon
............................................................................................................................................. [1]
(c) is an amphoteric oxide
............................................................................................................................................. [1]
DO NOT WRITE IN THIS MARGIN
(d) is a good conductor of electricity when solid
............................................................................................................................................. [1]
(e) contains simple molecules with 9 atoms
............................................................................................................................................. [1]
(f) react together to form slag in the blast furnace
................................................................... and .................................................................. [2]
DO NOT WRITE IN THIS MARGIN
(g) belongs to a homologous series whose general formula is CnH2n+2
............................................................................................................................................. [1]
(h) is manufactured by the catalytic addition of steam to ethene
............................................................................................................................................. [1]
(i) is a gas that is approximately 78% of clean, dry air.
............................................................................................................................................. [1]
[Total: 10]
DO NOT WRITE IN THIS MARGIN
ĬÏĊ®Ġ´íÈõÏĪÅĊÝù¸þ×
© UCLES 2025 ĬÃąüÚĠėĠÍøüđČËØéĦĂ
ĥÅÅÕõõŵąµĕąÅÕåĕĥÕ
0620/43/M/J/25 [Turn over
, ,
Cambridge IGCSE™
¬O. 4mHuOªE`y6W
¬C|SzSos;¨I4
¥euu¥5e EEueUU
* 4 4 2 3 9 0 4 1 2 9 *
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
© UCLES 2025 [Turn over
, © UCLES 2025
,
* 0000800000002 *
ĥŵĕµĕåÕĕÅÅąÅµÅÕõÕ
ĬÃĆûÒĪěĐìĂąØгĄéĖĂ
ĬÍĊ®Ġ´íÈõÏĪÅĊÝû¸þ×
,
2
0620/43/M/J/25
BLANK PAGE
DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN
, * 0000800000003 *
DO NOT WRITE IN THIS MARGIN
3
, ,
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:
DO NOT WRITE IN THIS MARGIN
(a) is a compound with a giant covalent structure
............................................................................................................................................. [1]
(b) is an unsaturated hydrocarbon
............................................................................................................................................. [1]
(c) is an amphoteric oxide
............................................................................................................................................. [1]
DO NOT WRITE IN THIS MARGIN
(d) is a good conductor of electricity when solid
............................................................................................................................................. [1]
(e) contains simple molecules with 9 atoms
............................................................................................................................................. [1]
(f) react together to form slag in the blast furnace
................................................................... and .................................................................. [2]
DO NOT WRITE IN THIS MARGIN
(g) belongs to a homologous series whose general formula is CnH2n+2
............................................................................................................................................. [1]
(h) is manufactured by the catalytic addition of steam to ethene
............................................................................................................................................. [1]
(i) is a gas that is approximately 78% of clean, dry air.
............................................................................................................................................. [1]
[Total: 10]
DO NOT WRITE IN THIS MARGIN
ĬÏĊ®Ġ´íÈõÏĪÅĊÝù¸þ×
© UCLES 2025 ĬÃąüÚĠėĠÍøüđČËØéĦĂ
ĥÅÅÕõõŵąµĕąÅÕåĕĥÕ
0620/43/M/J/25 [Turn over
