100% correct workings
CHE4807 EXAM PACK
2025/2026 –
QUESTION & ANSWERS
QUESTIONS & ANSWERS
, UNIVERSITY EXAMINATIONS
OCTOBER /NOVEMBER 2024
CHE4807
(3 HOURS)
ENVIRONMENTAL CHEMISTRY IV
Welcome to the CHE4807 exam.
Examiner name: PROF N MKETO
Internal moderator name: PROF VE PAKADE
External moderator name: PROF NC HINSTHO-MBITA
This paper consists of 09 pages.
Total marks: 100
Instructions:
• Answer ALL questions.
• This is a closed-book examination.
• This question paper consists of five questions; make sure you have them all.
• Connectivity to the internet and IRIS invigilation is compulsory.
• Please note that, by starting (and submitting) this Exam you fully agree to, and will adhere to, the
Honesty Declaration of the University of South Africa.
• Please tick the Honour Pledge box before submitting the examination paper.
• A periodic table and a formula sheet are attached at the end of the question paper.
• The use of a non-programmable calculator is permissible.
• Information on how to upload my examination answer file and preparing your answer file is
attached after page 8 of the exam question paper.
Additional student instructions
1. Students must upload their answer scripts in a single PDF file (answer scripts must not be
password protected or uploaded as “read only” files)
2. Incorrect file format and uncollated answer scripts will not be considered.
3. NO emailed scripts will be accepted.
4. Students are advised to preview submissions (answer scripts) to ensure legibility and that
the correct answer script file has been uploaded.
5. Incorrect answer scripts and/or submissions made on unofficial examinations platforms
(including the invigilator cell phone application) will not be marked and no opportunity will be
granted for resubmission. Only the last answer file uploaded within the stipulated submission
duration period will be marked.
6. Mark awarded for incomplete submission will be the student’s final mark. No opportunity for
resubmission will be granted.
7. Mark awarded for illegible scanned submission will be the student’s final mark. No
opportunity for resubmission will be granted.
8. Submissions will only be accepted from registered student accounts.
9. Students who have not utilised the proctoring tool will be deemed to have transgressed
Unisa’s examination rules and will have their marks withheld. If a student is found to have
been outside the proctoring tool for a total of 10 minutes during their examination session,
they will be considered to have violated Unisa’s examination rules and their marks will be
withheld. For examinations which use the IRIS invigilator system, IRIS must be recording
throughout the duration of the examination until the submission of the examinations scripts.
10. Students have 48 hours from the date of their examination to upload their invigilator results
from IRIS. Failure to do so will result in students deemed not to have utilized the proctoring
tools. by 100000901633086 from CourseHero.com on 10-30-2025 00:41:07 GMT -05:00
This study source was downloaded
1
https://www.coursehero.com/file/252079739/CHE4807-Oct-No-Exam-2024-question-paperpdf/
, 11. Students suspected of dishonest conduct during the examinations will be subjected
to disciplinary processes. Students may not communicate with any other person or
request assistance from any other person during their examinations. Plagiarism is a
violation of academic integrity and students who plagiarise, copy from published
work or Artificial Intelligence Software (eg ChatGPT) or online sources (eg course
material), will be in violation of the Policy on Academic Integrity and the Student
Disciplinary Code and may be referred to a disciplinary hearing. Unisa has a zero
tolerance for plagiarism and/or any other forms of academic dishonesty
12. Listening to audio (music) and making use of audio-to-text software is strictly
prohibited during your examination session unless such usage of the software is
related to a student’s assistive device which has been so declared. Failure to do so
will be a transgression of Unisa’s examination rules and the student's marks will be
withheld
13. Students are provided 30 minutes to submit their answer scripts after the official
examination time. Students who experience technical challenges should report the
challenges to the SCSC on 080 000 1870 or their College exam support centres
(refer to the Get help during the examinations by contacting the Student
Communication Service Centre [unisa.ac.za]) within 30 minutes. Queries received
after 30 minutes of the official examination duration time will not be responded to.
Submissions made after the official examination time will be rejected according to
the examination regulations and will not be marked. Only communication received
from your myLife account will be considered.
14. Non-adherence to the processes for uploading examination responses will not
qualify the student for any special concessions or future assessments.
15. Queries that are beyond Unisa’s control include the following:
a. Personal network or service provider issues
b. Load shedding/limited space on personal computer
c. Crashed computer
d. Non-functioning cameras or web cameras
e. Using work computers that block access to the myExams site (employer firewall
challenges)
f. Unlicensed software (eg license expires during exams)
16. Postgraduate students experiencing the above challenges are advised to apply for
an aegrotat and submit supporting evidence within ten days of the examination
session. Students will not be able to apply for an aegrotat for a third examination
opportunity.
17. Postgraduate/undergraduate students experiencing the above challenges in their
second examination opportunity will have to reregister for the affected module.
18. Students suspected of dishonest conduct during the examinations will be subjected to
disciplinary processes. UNISA has a zero tolerance for plagiarism and/or any other forms of
academic dishonesty.
19. Students experiencing network or load shedding challenges are advised to apply together
with supporting evidence for an Aegrotat within 3 days of the examination session.
This study source was downloaded by 100000901633086 from CourseHero.com on 10-30-2025 00:41:07 GMT -05:00
2
https://www.coursehero.com/file/252079739/CHE4807-Oct-No-Exam-2024-question-paperpdf/
CHE4807 EXAM PACK
2025/2026 –
QUESTION & ANSWERS
QUESTIONS & ANSWERS
, UNIVERSITY EXAMINATIONS
OCTOBER /NOVEMBER 2024
CHE4807
(3 HOURS)
ENVIRONMENTAL CHEMISTRY IV
Welcome to the CHE4807 exam.
Examiner name: PROF N MKETO
Internal moderator name: PROF VE PAKADE
External moderator name: PROF NC HINSTHO-MBITA
This paper consists of 09 pages.
Total marks: 100
Instructions:
• Answer ALL questions.
• This is a closed-book examination.
• This question paper consists of five questions; make sure you have them all.
• Connectivity to the internet and IRIS invigilation is compulsory.
• Please note that, by starting (and submitting) this Exam you fully agree to, and will adhere to, the
Honesty Declaration of the University of South Africa.
• Please tick the Honour Pledge box before submitting the examination paper.
• A periodic table and a formula sheet are attached at the end of the question paper.
• The use of a non-programmable calculator is permissible.
• Information on how to upload my examination answer file and preparing your answer file is
attached after page 8 of the exam question paper.
Additional student instructions
1. Students must upload their answer scripts in a single PDF file (answer scripts must not be
password protected or uploaded as “read only” files)
2. Incorrect file format and uncollated answer scripts will not be considered.
3. NO emailed scripts will be accepted.
4. Students are advised to preview submissions (answer scripts) to ensure legibility and that
the correct answer script file has been uploaded.
5. Incorrect answer scripts and/or submissions made on unofficial examinations platforms
(including the invigilator cell phone application) will not be marked and no opportunity will be
granted for resubmission. Only the last answer file uploaded within the stipulated submission
duration period will be marked.
6. Mark awarded for incomplete submission will be the student’s final mark. No opportunity for
resubmission will be granted.
7. Mark awarded for illegible scanned submission will be the student’s final mark. No
opportunity for resubmission will be granted.
8. Submissions will only be accepted from registered student accounts.
9. Students who have not utilised the proctoring tool will be deemed to have transgressed
Unisa’s examination rules and will have their marks withheld. If a student is found to have
been outside the proctoring tool for a total of 10 minutes during their examination session,
they will be considered to have violated Unisa’s examination rules and their marks will be
withheld. For examinations which use the IRIS invigilator system, IRIS must be recording
throughout the duration of the examination until the submission of the examinations scripts.
10. Students have 48 hours from the date of their examination to upload their invigilator results
from IRIS. Failure to do so will result in students deemed not to have utilized the proctoring
tools. by 100000901633086 from CourseHero.com on 10-30-2025 00:41:07 GMT -05:00
This study source was downloaded
1
https://www.coursehero.com/file/252079739/CHE4807-Oct-No-Exam-2024-question-paperpdf/
, 11. Students suspected of dishonest conduct during the examinations will be subjected
to disciplinary processes. Students may not communicate with any other person or
request assistance from any other person during their examinations. Plagiarism is a
violation of academic integrity and students who plagiarise, copy from published
work or Artificial Intelligence Software (eg ChatGPT) or online sources (eg course
material), will be in violation of the Policy on Academic Integrity and the Student
Disciplinary Code and may be referred to a disciplinary hearing. Unisa has a zero
tolerance for plagiarism and/or any other forms of academic dishonesty
12. Listening to audio (music) and making use of audio-to-text software is strictly
prohibited during your examination session unless such usage of the software is
related to a student’s assistive device which has been so declared. Failure to do so
will be a transgression of Unisa’s examination rules and the student's marks will be
withheld
13. Students are provided 30 minutes to submit their answer scripts after the official
examination time. Students who experience technical challenges should report the
challenges to the SCSC on 080 000 1870 or their College exam support centres
(refer to the Get help during the examinations by contacting the Student
Communication Service Centre [unisa.ac.za]) within 30 minutes. Queries received
after 30 minutes of the official examination duration time will not be responded to.
Submissions made after the official examination time will be rejected according to
the examination regulations and will not be marked. Only communication received
from your myLife account will be considered.
14. Non-adherence to the processes for uploading examination responses will not
qualify the student for any special concessions or future assessments.
15. Queries that are beyond Unisa’s control include the following:
a. Personal network or service provider issues
b. Load shedding/limited space on personal computer
c. Crashed computer
d. Non-functioning cameras or web cameras
e. Using work computers that block access to the myExams site (employer firewall
challenges)
f. Unlicensed software (eg license expires during exams)
16. Postgraduate students experiencing the above challenges are advised to apply for
an aegrotat and submit supporting evidence within ten days of the examination
session. Students will not be able to apply for an aegrotat for a third examination
opportunity.
17. Postgraduate/undergraduate students experiencing the above challenges in their
second examination opportunity will have to reregister for the affected module.
18. Students suspected of dishonest conduct during the examinations will be subjected to
disciplinary processes. UNISA has a zero tolerance for plagiarism and/or any other forms of
academic dishonesty.
19. Students experiencing network or load shedding challenges are advised to apply together
with supporting evidence for an Aegrotat within 3 days of the examination session.
This study source was downloaded by 100000901633086 from CourseHero.com on 10-30-2025 00:41:07 GMT -05:00
2
https://www.coursehero.com/file/252079739/CHE4807-Oct-No-Exam-2024-question-paperpdf/
