2025 First Term Examination On Chemistry SSS 1

Welcome to your 2025 First Term Examination On Chemistry SSS 1

Name

Class

1. What is the primary function of a mortar and pestle in the chemistry laboratory?

Holding test tube upright

Measuring the mass of solids

Grinding solids into a powder

Separating immiscible liquids

2. Identity the equipment used to separate two immiscible liquids such as oil and water.

Evaporating dish

Condenser

Filter funnel

Separating funnel

3. Which piece of equipment is placed on a tripod stand to support a beaker during heating?

Pipe clay triangle

Test tube holder

Retort stand

Wire gauze

4. What is the purpose of a lieberg condenser?

To store gas samples

To measure the boiling point of a liquid

To mix two reactive solutions

To cool and turn hot vapours back into liquids

5. Which instrument is used to measure the mass of a chemical substance?

Barometer

Chemical balance

Voltmeter

Spring balance

6. Which of the following is the smallest particle of an element that can take part in a chemical reaction?

Compound

Atom

Ion

molecule

7. The nucleus of an atom contains which of the following particles?

Protons and electrons

Protons and neutrons

Neutrons and electrons

protons only

8. Isotopes are atoms of the same element that have the same atomic number but different..........

Number of protons

Number of electrons

mass number

Chemical properties

9. A positive ion (cation) is formed when an atom

Gains electrons

Gains neutrons

Loses protons

Loses electrons

10. What is the maximum number of electrons that can occupy the K-shell?

11. Which of the following is a diatomic molecule?

Phosphorus,P4

Oxygen, O2

Sulphur, S8

Helium,He

12. An atom has an atomic number of 11 and a mass number of 23. How many neutrons does it have?

13. The combining power of an element is known as it's?

Atomicity

Electronegativity

Ionization energy

Valency

14. What is the relative molecular mass of water, H2O? [H=1, O=16]

15. Avogadro's constant is approximately equal to;

1.67*10²⁷

6.02*10²²

6.02*10²³

9.11*10-³¹

16. What is the correct chemical formula for sodium tetraoxosulphate (vi)?

Na(SO4)2

Na2SO4

Na2S

NaSO4

17. In the chemical equation A+B--->C+D, what are A and B called?

Products

Reactants

Precipitates

catalysts

18. Which law states that matter is neither created nor destroyed during a chemical reaction?

Law of definite proportions

Law of conservation of mass

law of multiple proportions

Avogadro's law

19. What is the correct IUPAC name for the compound, Fe2O3?

Iron oxide

Iron(ii) oxide

Iron(III) oxide

Di-iron-trioxide

20. How many atoms of oxygen are in 3H2SO4?

Subjectives

1. The chemical symbol "Ag" stands for..........

2. The chemical formula for Ammonium chloride is ........

3. Which radical is represented in the compound, KNO3..............

4. The number of protons in the nucleus of an atom is called the .........

5. IUPAC means .......

6. ..........is used to represent compounds.

7. The scientist who proved that atom is divisible was ........

8. ........... is the branch of chemistry studies elements, compounds and mixtures as well as acids, bases and salts.

9..........and 10.........are the types of changes.

Essay Answer Only 4 Questions

1a. Define Chemistry as field of study. 1b. Mention 4 laboratory equipment in chemistry. 1c. State 2 adverse effects of chemical industries in Nigeria.

2a. Differentiate between element and compound. 2b. Find the oxidation number of carbon in CO2 and write the name of the compound [C=12, O=16]

3a. State Hund's Rule. 3b. Write the spdf configuration of the following elements: a. Nitrogen b. Sodium c. Chlorine

4a. Find the relative molecular mass of Potassium tetraoxosulphate (vi) salt, K2SO4[K=39, S=32, O=16] 4b. What is atomicity?

5a. Calculate the number of moles of oxygen present in 20g of calcium trioxocarbonate (IV), CaCO3. 5b. Explain i. Molecule ii. Ion

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