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CHEMISTRY 0620/63
Paper 6 Alternative to Practical October/November 2025
1 hour
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 40.
● The number of marks for each question or part question is shown in brackets [ ].
● Notes for use in qualitative analysis are provided in the question paper.
This document has 16 pages. Any blank pages are indicated.
DC (EV/SG) 346856/4
© UCLES 2025 [Turn over
, * 0000800000002 * DFD
DO NOT WRITE IN THIS MARGIN
2
, ,
1 A student uses the apparatus in Fig. 1.1 to show that water is formed as one of the products when
a fuel is burned. The gases produced when the fuel is burned are passed through the apparatus
using a suction pump.
U-tube to suction
pump
W
burning
DO NOT WRITE IN THIS MARGIN
fuel
ice solid X
Fig. 1.1
(a) Identify the item of apparatus labelled W in Fig. 1.1.
............................................................................................................................................. [1]
DO NOT WRITE IN THIS MARGIN
(b) When the fuel is burned, the steam produced passes into the U-tube.
Suggest why the U-tube is surrounded by ice.
............................................................................................................................................. [1]
(c) Water causes solid X in the U-tube to change colour.
Name solid X and state the colour change seen.
solid X .......................................................................................................................................
DO NOT WRITE IN THIS MARGIN
colour change from ...................................................... to ........................................................
[2]
.
DO NOT WRITE IN THIS MARGIN
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0620/63/O/N/25
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3
, ,
The student tries to use the apparatus in Fig. 1.2 to pass the gases produced through acidified
aqueous potassium manganate(VII).
There is an error in the apparatus in Fig. 1.2 so that the gases produced will not pass through
the acidified aqueous potassium manganate(VII).
to suction
pump
DO NOT WRITE IN THIS MARGIN
Y
burning
fuel
acidified aqueous
potassium manganate(VII)
Fig. 1.2
(d) Identify the item of apparatus labelled Y in Fig. 1.2.
DO NOT WRITE IN THIS MARGIN
............................................................................................................................................. [1]
(e) On Fig. 1.2, draw a circle around the error in the apparatus. [1]
(f) The error in the apparatus in Fig. 1.2 is corrected.
The student observes that the acidified aqueous potassium manganate(VII) changes colour
from purple to colourless.
Suggest why this colour change occurs.
...................................................................................................................................................
DO NOT WRITE IN THIS MARGIN
............................................................................................................................................. [1]
[Total: 7]
DO NOT WRITE IN THIS MARGIN
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0620/63/O/N/25 [Turn over
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4
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BLANK PAGE
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DO NOT WRITE IN THIS MARGIN
DO NOT WRITE IN THIS MARGIN
DO NOT WRITE IN THIS MARGIN
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0620/63/O/N/25
, ,
Cambridge IGCSE™
¬O. 4mHuOªE_{6W
¬<zO¤¡©W|{r>¬ZRt
¥UEU5ue¥e¥E UEuuU
* 9 1 7 2 3 7 5 3 8 2 *
CHEMISTRY 0620/63
Paper 6 Alternative to Practical October/November 2025
1 hour
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 40.
● The number of marks for each question or part question is shown in brackets [ ].
● Notes for use in qualitative analysis are provided in the question paper.
This document has 16 pages. Any blank pages are indicated.
DC (EV/SG) 346856/4
© UCLES 2025 [Turn over
, * 0000800000002 * DFD
DO NOT WRITE IN THIS MARGIN
2
, ,
1 A student uses the apparatus in Fig. 1.1 to show that water is formed as one of the products when
a fuel is burned. The gases produced when the fuel is burned are passed through the apparatus
using a suction pump.
U-tube to suction
pump
W
burning
DO NOT WRITE IN THIS MARGIN
fuel
ice solid X
Fig. 1.1
(a) Identify the item of apparatus labelled W in Fig. 1.1.
............................................................................................................................................. [1]
DO NOT WRITE IN THIS MARGIN
(b) When the fuel is burned, the steam produced passes into the U-tube.
Suggest why the U-tube is surrounded by ice.
............................................................................................................................................. [1]
(c) Water causes solid X in the U-tube to change colour.
Name solid X and state the colour change seen.
solid X .......................................................................................................................................
DO NOT WRITE IN THIS MARGIN
colour change from ...................................................... to ........................................................
[2]
.
DO NOT WRITE IN THIS MARGIN
ĬÍĊ®Ġ´íÈõÏĪÅĊÞù¸þ×
© UCLES 2025 ĬĊºùÎĨĥÿàąýčöĒĪĪüĂ
ĥąÕÕõĕĥõÕĥµąąĕåµÕÕ
0620/63/O/N/25
, * 0000800000003 * DFD
DO NOT WRITE IN THIS MARGIN
3
, ,
The student tries to use the apparatus in Fig. 1.2 to pass the gases produced through acidified
aqueous potassium manganate(VII).
There is an error in the apparatus in Fig. 1.2 so that the gases produced will not pass through
the acidified aqueous potassium manganate(VII).
to suction
pump
DO NOT WRITE IN THIS MARGIN
Y
burning
fuel
acidified aqueous
potassium manganate(VII)
Fig. 1.2
(d) Identify the item of apparatus labelled Y in Fig. 1.2.
DO NOT WRITE IN THIS MARGIN
............................................................................................................................................. [1]
(e) On Fig. 1.2, draw a circle around the error in the apparatus. [1]
(f) The error in the apparatus in Fig. 1.2 is corrected.
The student observes that the acidified aqueous potassium manganate(VII) changes colour
from purple to colourless.
Suggest why this colour change occurs.
...................................................................................................................................................
DO NOT WRITE IN THIS MARGIN
............................................................................................................................................. [1]
[Total: 7]
DO NOT WRITE IN THIS MARGIN
ĬÏĊ®Ġ´íÈõÏĪÅĊÞû¸þ×
© UCLES 2025 ĬĊ¹úÖĢĩïÙóôÜâĪ®ĪČĂ
ĥąåĕµõąĕÅĕĥąąõÅõÅÕ
0620/63/O/N/25 [Turn over
, * 0000800000004 * DFD
DO NOT WRITE IN THIS MARGIN
4
, ,
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
ĬÍĊ®Ġ´íÈõÏĪÅĊàù¸Ā×
© UCLES 2025 ĬĊ¹ûÖĬěúÞíûÓĄÆĐúôĂ
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0620/63/O/N/25
