Choose the correct answer for each of the following questions. Which of the following careers fits best with a person who studied chemistry at university?

A. Pharmacist. A pharmacist prepares and dispenses medicines, which requires a deep knowledge of chemical substances and how they react. The other careers depend mainly on economics or communication.

Choose the correct answer for each of the following questions about chemical bonding and properties of metals. Which of the following statements about covalent bonds is correct?

A. They are formed by sharing pairs of electrons between non-metal atoms. In a covalent bond two non-metal atoms share one or more pairs of electrons; no ions are formed.

Fill in each blank with the correct term from the word bank. Each term is used once: **waste materials**, **biodegradable wastes**, **non-biodegradable wastes**. Banana peels, leaves and old newspapers are …… because bacteria and fungi can break them down.

biodegradable wastes. Biodegradable wastes are decomposed naturally by microorganisms.

All practice exams

Senior 3 (O-Level)ChemistryNESA format

S3 Chemistry practice exam

Practise for the national exam the way it really feels. This paper follows the structure, question types, marks and timing of the NESA Senior 3 (O-Level) Chemistry exam.

These questions simulate the national exam. They are original Ganzaa questions written in the same format as the NESA papers — not the official NESA papers, and not endorsed by NESA. The official papers stay free on our past papers page.

A new paper every time

10 versions of every question, so each attempt is a fresh paper with the same structure.

Real exam conditions

180 minutes, 100 marks, the same sections and question types as the national exam.

Marked when you finish

Your score, the correct answer to every question and a clear explanation of why.

How the paper is organised

Section A

Attempt ALL questions. (55 marks)

55 marks

Section B

Attempt any THREE (3) questions. (30 marks)

Answer any 3 of 5

30 marks

Section C

Attempt any ONE (1) question. (15 marks)

Answer any 1 of 2

15 marks

Before you start

This paper has THREE sections: A, B and C.
Section A: Attempt ALL questions. (55 marks)
Section B: Attempt any THREE questions. (30 marks)
Section C: Attempt any ONE question. (15 marks)
You do not need a periodic table. Atomic masses and atomic numbers are given where needed.
Silent non-programmable calculators may be used.
For multiple choice questions, choose the letter of the correct answer.
The timer starts when you open the paper and keeps running if you leave.
Your answers save automatically — you can continue on another device before time runs out.
When time is up, the exam is submitted for you.

Sample questions

A taste of the paper. Every exam you sit has different questions in this style.

Sample 1 · Introduction to chemistry: applications, careers and misuse
Choose the correct answer for each of the following questions.
(i)
Which of the following careers fits best with a person who studied chemistry at university?
1. A.Pharmacist
2. B.Tour guide
3. C.Financial analyst
4. D.Economist
Show the answer
Answer: A. Pharmacist
A pharmacist prepares and dispenses medicines, which requires a deep knowledge of chemical substances and how they react. The other careers depend mainly on economics or communication.
Sample 2 · Chemical bonding and properties of metals
Choose the correct answer for each of the following questions about chemical bonding and properties of metals.
(i)
Which of the following statements about covalent bonds is correct?
1. A.They are formed by sharing pairs of electrons between non-metal atoms
2. B.They always produce charged particles called ions
3. C.They are formed between two metal atoms
4. D.They are formed by transfer of electrons from a metal to a non-metal
Show the answer
Answer: A. They are formed by sharing pairs of electrons between non-metal atoms
In a covalent bond two non-metal atoms share one or more pairs of electrons; no ions are formed.
Sample 3 · Wastes
Fill in each blank with the correct term from the word bank. Each term is used once: waste materials, biodegradable wastes, non-biodegradable wastes.
(i)
Banana peels, leaves and old newspapers are …… because bacteria and fungi can break them down.
Show the answer
Answer: biodegradable wastes
Biodegradable wastes are decomposed naturally by microorganisms.

All practice exams

Senior 3 (O-Level)ChemistryNESA format

S3 Chemistry practice exam

Practise for the national exam the way it really feels. This paper follows the structure, question types, marks and timing of the NESA Senior 3 (O-Level) Chemistry exam.

A new paper every time

10 versions of every question, so each attempt is a fresh paper with the same structure.

Real exam conditions

180 minutes, 100 marks, the same sections and question types as the national exam.

Marked when you finish

Your score, the correct answer to every question and a clear explanation of why.

How the paper is organised

Section A

Attempt ALL questions. (55 marks)

55 marks

Section B

Attempt any THREE (3) questions. (30 marks)

Answer any 3 of 5

30 marks

Section C

Attempt any ONE (1) question. (15 marks)

Answer any 1 of 2

15 marks

Before you start

This paper has THREE sections: A, B and C.
Section A: Attempt ALL questions. (55 marks)
Section B: Attempt any THREE questions. (30 marks)
Section C: Attempt any ONE question. (15 marks)
You do not need a periodic table. Atomic masses and atomic numbers are given where needed.
Silent non-programmable calculators may be used.
For multiple choice questions, choose the letter of the correct answer.
The timer starts when you open the paper and keeps running if you leave.
Your answers save automatically — you can continue on another device before time runs out.
When time is up, the exam is submitted for you.

Sample questions

A taste of the paper. Every exam you sit has different questions in this style.

Sample 1 · Introduction to chemistry: applications, careers and misuse
Choose the correct answer for each of the following questions.
(i)
Which of the following careers fits best with a person who studied chemistry at university?
1. A.Pharmacist
2. B.Tour guide
3. C.Financial analyst
4. D.Economist
Show the answer
Answer: A. Pharmacist
A pharmacist prepares and dispenses medicines, which requires a deep knowledge of chemical substances and how they react. The other careers depend mainly on economics or communication.
Sample 2 · Chemical bonding and properties of metals
Choose the correct answer for each of the following questions about chemical bonding and properties of metals.
(i)
Which of the following statements about covalent bonds is correct?
1. A.They are formed by sharing pairs of electrons between non-metal atoms
2. B.They always produce charged particles called ions
3. C.They are formed between two metal atoms
4. D.They are formed by transfer of electrons from a metal to a non-metal
Show the answer
Answer: A. They are formed by sharing pairs of electrons between non-metal atoms
In a covalent bond two non-metal atoms share one or more pairs of electrons; no ions are formed.
Sample 3 · Wastes
Fill in each blank with the correct term from the word bank. Each term is used once: waste materials, biodegradable wastes, non-biodegradable wastes.
(i)
Banana peels, leaves and old newspapers are …… because bacteria and fungi can break them down.
Show the answer
Answer: biodegradable wastes
Biodegradable wastes are decomposed naturally by microorganisms.