Level: JHS, Basic 8 | Subject: Integrated Science | Strand: Diversity of Matter | Topic: Materials
Read the summary notes first, then try these questions. Go back to the summary notes for this topic.
Part A has 20 tick-box questions. Part B has 5 essay questions with a marking guide at the bottom.
Test Yourself: 20 Objective Questions
Tick one answer for each question, then press Review answer. If your answer is wrong, it will be marked first, then the correct answer will show in green.
1. The smallest particle of an element that can take part in a chemical reaction is the
2. Which particles are found in the nucleus of an atom?
3. An electron carries a
4. A neutron has
5. An atom has no overall charge because
6. A molecule is
7. Which of these is a molecule of a compound?
8. A molecule of carbon dioxide, CO2, contains
9. Atomicity is the
10. A monoatomic element has
11. Which of these is monoatomic?
12. Which of these is diatomic?
13. The atomicity of nitrogen, N2, is
14. Ozone, O3, is an example of a
15. The atomicity of phosphorus, P4, is
16. Which of these is an element?
17. Which statement about water, H2O, is correct?
18. In a model of an atom, electrons are drawn
19. A class can make a simple model of an atom using
20. Which pair shows two diatomic gases?
Essay Questions
- (a) What is an atom? (b) Name the three particles found in an atom and state the charge of each. (6 marks)
- (a) What is a molecule? (b) Give one example of a molecule of an element and one example of a molecule of a compound. (4 marks)
- (a) Define atomicity. (b) Copy and complete the table: helium, oxygen, ozone, phosphorus (P4). Write the atomicity and the type (monoatomic, diatomic and so on) for each. (6 marks)
- Describe how you would make a simple model of an atom in class. (4 marks)
- Explain why an atom has no overall charge. (3 marks)
Essay Questions: Marking Guide for Teachers and Parents
- (a) The smallest particle of an element that can take part in a chemical reaction (2). (b) Proton, positive (1); neutron, no charge (1); electron, negative (1); where found: protons and neutrons in the nucleus, electrons round the nucleus (1).
- (a) Two or more atoms joined together (2). (b) Element, e.g. oxygen O2 or hydrogen H2 (1). Compound, e.g. water H2O or carbon dioxide CO2 (1).
- (a) The number of atoms in one molecule of an element (2). (b) Helium: 1, monoatomic (1); oxygen: 2, diatomic (1); ozone: 3, triatomic (1); phosphorus: 4, polyatomic (1).
- Use clay, beads or bottle tops (1). Make a ball of clay for the nucleus and mark protons and neutrons on it (1). Fix wire or string rings round it (1). Place small beads on the rings for electrons (1).
- It has the same number of protons and electrons (1). Protons are positive and electrons are negative (1). The positive and negative charges cancel each other (1).
Education Always (education.inspiringalways.com). Original practice questions, not official WAEC or BECE questions.