BOTSWANA EXAMINATIONS COUNCIL
Botswana General Certificate of Secondary Education
CANDIDATE
NAME
CENTRE CANDIDATE
NUMBER NUMBER
CHEMISTRY 1429/01
Paper 1 Theory For Examination from 2025
SPECIMEN PAPER
1 hour 30 minutes
Candidates answer on the Question Paper
Additional Materials: Answer Booklet
Electronic calculator
30 cm ruler
INSTRUCTIONS
• Answer all questions.
• Write your candidate name, Centre number and candidate number in the spaces provided at the
top of this page and on all work you hand in.
• Write in dark blue or black pen.
• Write your answer to each question in the spaces provided.
• You may use and HB pencil for any diagrams, graphs or rough working.
• Do not use staples, paper clips, highlighters, glue or correction fluid.
• Do not write in any barcodes.
• Electronic calculators may be used.
INFORMATION
• The total marks for this paper is 70. For Examiner’s Use
• You may lose marks if you do not show your working or if
you do not use appropriate units. 1
• The number of marks is given in brackets [ ] at the end of each
question or part question. 2
• The Periodic Table is on page 16. 3
4
5
6
7
8
Total
This document consists of 13 printed pages and 3 blank pages.
© BEC 2025 [Turn over
, 2 For
examiners’
use
1. The table shows the percentage abundance of the atoms of chlorine.
atom Percentage abundance
35
17 Cl 75
37
17 Cl 25
(a) State the name that describe these two atoms.
…………………………………………………………………………………….……….[1]
(b) Calculate the relative atomic mass (Ar) of chlorine.
Ar = ……..…… [2]
(c) What is the mass number of each atom of chlorine.
35 37
Cl ……………………… Cl
17 17 ………………………… [1]
(d) Chlorine gas reacts with sodium to form sodium chloride.
(i) Write a balanced chemical equation for the reaction. Include state symbols.
……………………………………………………………………………………….[3]
(ii) Draw a ‘dot’ and ‘cross’ diagram to show bonding in sodium chloride.
Show all electrons.
[3]
(iii) State one property of compounds with the type of bonding as in sodium chloride
.………………………………………………………………………………………..……
[1]
[Total: 11]
©BEC 2025 1429/01/O/N/25 Turn over
, 3 For
examiners’
use
2. A student was provided with copper (II) oxide and dilute sulphuric acid to prepare a salt.
(a) Name the salt that will be formed.
…………………………………………………………………………………….………..[1]
(b) Copper (II) oxide can also be reacted with hydrogen to produce copper.
Copper is used in making water pipes.
(i) Give a reason why copper is used in water pipes.
…………………………………………………………………………………….…………...
…………………………………………………………………………………….……..…[1]
(ii) State one other use of copper
.…………………………………………………………………………………….. [1]
(iii) Copper can also be used in to make alloys.
What is an alloy?
………………………………………………………………………………………….
……………………………………………………………………………………….[1]
(iv) Name one alloy of copper.
……………………………………………………………………………………….[1]
[Total: 5]
©BEC 2025 1429/01/O/N/25 Turn over
Botswana General Certificate of Secondary Education
CANDIDATE
NAME
CENTRE CANDIDATE
NUMBER NUMBER
CHEMISTRY 1429/01
Paper 1 Theory For Examination from 2025
SPECIMEN PAPER
1 hour 30 minutes
Candidates answer on the Question Paper
Additional Materials: Answer Booklet
Electronic calculator
30 cm ruler
INSTRUCTIONS
• Answer all questions.
• Write your candidate name, Centre number and candidate number in the spaces provided at the
top of this page and on all work you hand in.
• Write in dark blue or black pen.
• Write your answer to each question in the spaces provided.
• You may use and HB pencil for any diagrams, graphs or rough working.
• Do not use staples, paper clips, highlighters, glue or correction fluid.
• Do not write in any barcodes.
• Electronic calculators may be used.
INFORMATION
• The total marks for this paper is 70. For Examiner’s Use
• You may lose marks if you do not show your working or if
you do not use appropriate units. 1
• The number of marks is given in brackets [ ] at the end of each
question or part question. 2
• The Periodic Table is on page 16. 3
4
5
6
7
8
Total
This document consists of 13 printed pages and 3 blank pages.
© BEC 2025 [Turn over
, 2 For
examiners’
use
1. The table shows the percentage abundance of the atoms of chlorine.
atom Percentage abundance
35
17 Cl 75
37
17 Cl 25
(a) State the name that describe these two atoms.
…………………………………………………………………………………….……….[1]
(b) Calculate the relative atomic mass (Ar) of chlorine.
Ar = ……..…… [2]
(c) What is the mass number of each atom of chlorine.
35 37
Cl ……………………… Cl
17 17 ………………………… [1]
(d) Chlorine gas reacts with sodium to form sodium chloride.
(i) Write a balanced chemical equation for the reaction. Include state symbols.
……………………………………………………………………………………….[3]
(ii) Draw a ‘dot’ and ‘cross’ diagram to show bonding in sodium chloride.
Show all electrons.
[3]
(iii) State one property of compounds with the type of bonding as in sodium chloride
.………………………………………………………………………………………..……
[1]
[Total: 11]
©BEC 2025 1429/01/O/N/25 Turn over
, 3 For
examiners’
use
2. A student was provided with copper (II) oxide and dilute sulphuric acid to prepare a salt.
(a) Name the salt that will be formed.
…………………………………………………………………………………….………..[1]
(b) Copper (II) oxide can also be reacted with hydrogen to produce copper.
Copper is used in making water pipes.
(i) Give a reason why copper is used in water pipes.
…………………………………………………………………………………….…………...
…………………………………………………………………………………….……..…[1]
(ii) State one other use of copper
.…………………………………………………………………………………….. [1]
(iii) Copper can also be used in to make alloys.
What is an alloy?
………………………………………………………………………………………….
……………………………………………………………………………………….[1]
(iv) Name one alloy of copper.
……………………………………………………………………………………….[1]
[Total: 5]
©BEC 2025 1429/01/O/N/25 Turn over
