UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
International General Certifi cate of Secondary Education
*7086809263*
CHEMISTRY 0620/22
May/June 2025
1 hour 15 minutes
Candidates answer on the Question Paper.
No Additional Materials are required.
READ THESE INSTRUCTIONS FIRST
Write your Centre number, candidate number and name in the spaces at the top of this page.
Write in dark blue or black pen.
bestexamhelp.com
You may need to use a pencil for any diagrams, graphs or rough working.
Do not use staples, paper clips, highlighters, glue or correction fl uid.
DO NOT WRITE IN ANY BARCODES.
Answer all questions.
A copy of the Periodic Table is printed on page 16.
At the end of the examination, fasten all your work securely together.
The number of marks is given in brackets [ ] at the end of each question or part
question.
For Examiner’s Use
1
2
3
4
5
6
7
Total
This document consists of 14 printed pages and 2 blank pages. Total 16
[Turn over
, 2
For
1 (a)Gases can be identified using specific tests. Examiner ’s
Below are some gases and tests to identify them. Use
Match the gases on the left with the tests on the right.
sulfur dioxide turns limewater milky
Ammonia turns potassium
manganate colorless
relights a glowing splint
oxygen
Turns red litmus
carbon dioxide paper blue
[4]
(b) Fluorine can be prepared by heating Hydrofloric acid with manganese( IV ) oxide.
MnO₂ + 4HF → MnF₂ + F₂ + 2H2O
(i) Write a word equation for this reaction.
[3]
© UCLES 2025
, 3
For
(ii) Oxygen is Examiner ’s
Use
● less dense than air
● soluble in water.
Which one of the following diagrams, A, B or C , best describes how Oxygen gas is
collected?
A B C
Answer = ......................... [1]
(c) Hydrogen reacts with oxygen to form water.
(i) Complete the equation for this reaction.
4H₂ + ....... → .....H₂O
[2]
(ii) State one use of
Ethene. , ...................................................................................................................
Methane. ................................................................................................................... [2]
[Total: 12]
[Turn over
, 4
For
2 Alkalis are soluble bases. (a) Which one of Examiner ’s
the following is acidic? Use
Put a ring around the correct answer.
distilled water sodium Nitric acid
chloride solution Potassium hydroxide solution
[1]
(b) Suggest a pH value for a solution which is acidic.
..................................................................................................................................... [1]
(c) Describe how you would find the pH of a solution.
...........................................................................................................................................
...........................................................................................................................................
..................................................................................................................................... [2]
(d) When excess fertilisers are put on the soil, the soil may become acidic.
(i) What is the benefit of fertilisers ?
.............................................................................................................................. [1]
(ii) Calcium carbonate is used to decrease the acidity of the soil. Explain how calcium
carbonate decreases soil acidity.
....................................................................................................................................
.............................................................................................................................. [2]
[Total: 7]
, 5
For
3 The table below shows some properties of the halogens. Examiner ’s
Use
halogen melting point / °C boiling point / °C colour
chlorine –101 –35
bromine –7 +59
iodine +114 +184 greyish-black
(a) (i) Complete the spaces in the table to show the colours of chlorine and bromine. [2]
(ii) Room temperature is about 20 °C.
Use the information in the table to explain why
chlorine is a gas at room temperature, ......................................................................
....................................................................................................................................
bromine is a liquid at room temperature. ...................................................................
.............................................................................................................................. [2]
(iii) Astatine is the halogen below iodine in the Periodic Table.
Suggest a value for the melting point of astatine.
.............................................................................................................................. [1]
(b) Fluorine reacts with an aqueous solution of Sodium bromide.
(i) Complete the balanced equation for this reaction.
2F₂ + .....NaBr → 4NaF + .......
[2]
(ii) State the names of the products of this reaction.
.............................................................................................................................. [2]
(iii) To which period in the Periodic Table does Fluorine belong?
.............................................................................................................................. [1]
(c) Complete the following sentences about the test for iodide ions using words from the list
below.
hydrochloric nitric potassium precipitate
silver solution white yellow
Asmall volume of solution containing aqueous iodide ions is put into a test-tube. Dilute
........................ acid is added followed by a few drops of ........................ nitrate solution.
A ........................ coloured ........................ is formed if iodide ions are present. [4]
[Total: 14]
[Turn over
, 6
For
4 The diagram below shows the structure of some substances containing nitrogen. Examiner ’s
Use
NO₂
(a) (i) Which one of these substances, A, B, C, D or E, is an acidic gas?
(ii) Which one of these substances is an ionic salt?
(iii) Which one of these substances contains a carboxylic acid functional group?
[3]
(b) Oxides of nitrogen such as nitrogen dioxide, NO2, are atmospheric pollutants.
What is the source of nitrogen that forms the nitrogen dioxide
..................................................................................................................................... [1]
(c)nitrogen dioxide is harmful and changes litmus paper into which color .
..................................................................................................................................... [1]
(d) Calculate the relative formula mass of dinitrogen tetroxide, N₂O₄.
[1]
(e) In the presence of a catalyst, nitrogen dioxide reacts with carbon monoxide.
2NO₂ + 4CO → N₂ + 4CO₂
(i) Which substance gets oxidised during this reaction? Explain your answer.
....................................................................................................................................
.............................................................................................................................. [2]
International General Certifi cate of Secondary Education
*7086809263*
CHEMISTRY 0620/22
May/June 2025
1 hour 15 minutes
Candidates answer on the Question Paper.
No Additional Materials are required.
READ THESE INSTRUCTIONS FIRST
Write your Centre number, candidate number and name in the spaces at the top of this page.
Write in dark blue or black pen.
bestexamhelp.com
You may need to use a pencil for any diagrams, graphs or rough working.
Do not use staples, paper clips, highlighters, glue or correction fl uid.
DO NOT WRITE IN ANY BARCODES.
Answer all questions.
A copy of the Periodic Table is printed on page 16.
At the end of the examination, fasten all your work securely together.
The number of marks is given in brackets [ ] at the end of each question or part
question.
For Examiner’s Use
1
2
3
4
5
6
7
Total
This document consists of 14 printed pages and 2 blank pages. Total 16
[Turn over
, 2
For
1 (a)Gases can be identified using specific tests. Examiner ’s
Below are some gases and tests to identify them. Use
Match the gases on the left with the tests on the right.
sulfur dioxide turns limewater milky
Ammonia turns potassium
manganate colorless
relights a glowing splint
oxygen
Turns red litmus
carbon dioxide paper blue
[4]
(b) Fluorine can be prepared by heating Hydrofloric acid with manganese( IV ) oxide.
MnO₂ + 4HF → MnF₂ + F₂ + 2H2O
(i) Write a word equation for this reaction.
[3]
© UCLES 2025
, 3
For
(ii) Oxygen is Examiner ’s
Use
● less dense than air
● soluble in water.
Which one of the following diagrams, A, B or C , best describes how Oxygen gas is
collected?
A B C
Answer = ......................... [1]
(c) Hydrogen reacts with oxygen to form water.
(i) Complete the equation for this reaction.
4H₂ + ....... → .....H₂O
[2]
(ii) State one use of
Ethene. , ...................................................................................................................
Methane. ................................................................................................................... [2]
[Total: 12]
[Turn over
, 4
For
2 Alkalis are soluble bases. (a) Which one of Examiner ’s
the following is acidic? Use
Put a ring around the correct answer.
distilled water sodium Nitric acid
chloride solution Potassium hydroxide solution
[1]
(b) Suggest a pH value for a solution which is acidic.
..................................................................................................................................... [1]
(c) Describe how you would find the pH of a solution.
...........................................................................................................................................
...........................................................................................................................................
..................................................................................................................................... [2]
(d) When excess fertilisers are put on the soil, the soil may become acidic.
(i) What is the benefit of fertilisers ?
.............................................................................................................................. [1]
(ii) Calcium carbonate is used to decrease the acidity of the soil. Explain how calcium
carbonate decreases soil acidity.
....................................................................................................................................
.............................................................................................................................. [2]
[Total: 7]
, 5
For
3 The table below shows some properties of the halogens. Examiner ’s
Use
halogen melting point / °C boiling point / °C colour
chlorine –101 –35
bromine –7 +59
iodine +114 +184 greyish-black
(a) (i) Complete the spaces in the table to show the colours of chlorine and bromine. [2]
(ii) Room temperature is about 20 °C.
Use the information in the table to explain why
chlorine is a gas at room temperature, ......................................................................
....................................................................................................................................
bromine is a liquid at room temperature. ...................................................................
.............................................................................................................................. [2]
(iii) Astatine is the halogen below iodine in the Periodic Table.
Suggest a value for the melting point of astatine.
.............................................................................................................................. [1]
(b) Fluorine reacts with an aqueous solution of Sodium bromide.
(i) Complete the balanced equation for this reaction.
2F₂ + .....NaBr → 4NaF + .......
[2]
(ii) State the names of the products of this reaction.
.............................................................................................................................. [2]
(iii) To which period in the Periodic Table does Fluorine belong?
.............................................................................................................................. [1]
(c) Complete the following sentences about the test for iodide ions using words from the list
below.
hydrochloric nitric potassium precipitate
silver solution white yellow
Asmall volume of solution containing aqueous iodide ions is put into a test-tube. Dilute
........................ acid is added followed by a few drops of ........................ nitrate solution.
A ........................ coloured ........................ is formed if iodide ions are present. [4]
[Total: 14]
[Turn over
, 6
For
4 The diagram below shows the structure of some substances containing nitrogen. Examiner ’s
Use
NO₂
(a) (i) Which one of these substances, A, B, C, D or E, is an acidic gas?
(ii) Which one of these substances is an ionic salt?
(iii) Which one of these substances contains a carboxylic acid functional group?
[3]
(b) Oxides of nitrogen such as nitrogen dioxide, NO2, are atmospheric pollutants.
What is the source of nitrogen that forms the nitrogen dioxide
..................................................................................................................................... [1]
(c)nitrogen dioxide is harmful and changes litmus paper into which color .
..................................................................................................................................... [1]
(d) Calculate the relative formula mass of dinitrogen tetroxide, N₂O₄.
[1]
(e) In the presence of a catalyst, nitrogen dioxide reacts with carbon monoxide.
2NO₂ + 4CO → N₂ + 4CO₂
(i) Which substance gets oxidised during this reaction? Explain your answer.
....................................................................................................................................
.............................................................................................................................. [2]
