2025 FIRST TERM EXAMINATION CHEMISTRY SSS 2

1. The modern periodic law states that the physical and chemical properties of elements are a periodic function of their _

2. Which of the following properties generally decreases across a period from left to right?

3. Elements in the same group of the periodic table have the same

4. Which block of the periodic table contains the transition metals

5. The element with the electronic configuration 1S² 2S² 2p⁶ 3S² 3p⁵ belongs to which group and period?

6. Which of the following elements has the highest electronegativity

7. What is the general trend of ionization energy as you move down a group

8. which of the following is a metalloid

9. The lanthanides and Actinides are located in the

10. which oxide is basic in nature

11. Why are Noble Gases ( group 18) chemically unreactive

12. The energy change that occurs when an electron is added to a neutral gaseous atom is called

13. How does a catalyst increase the rate of a chemical reaction

14. What type of reaction is represented by the equation: AgNO3 (aq) + Nacl (aq) --->Agcl(s) + NaNO3 (aq)?

15. What is the minimum amount of energy required for a reaction to occur called?

16. What is the oxidation number of Manganese in potassium permanganate, KMnO4

17. Consider the reaction: zn(s) + CuSo4(aq) ----->znS04(aq) + Cu(s). which substance is oxidized

18. In the reaction 2H2s + SO2 --->3s + 2H20 , what role does SO2 play

19. The following elements are in group 2 except

20. Substances that slow down or hinder chemical reaction is said to be

SUBJECTIVE

1. ___ and 2. __ are the examples of lanthanides and Actinides

3. ___ and 4. ___ are features of the periodic table

5. In redox reaction, the agents involved are ___ and 6.___

7. Group 2 elements are called __

8. ___ and 9. ___ are halogens

10. __ involves the type of reaction as a result of the position of an element in the electrochemical series

ESSAY Answer All 1a. place the following elements in a broad form of the periodic table; i.calcium ii. Neon iii. lithium iv. sulphur v. vanadium 1b. Explain the following as regards to their trend across the period and down the group; i. Atomic radii ii. Electronegativity 2a. what is chemical reaction 2b. with a balanced chemical equation; explain i. decomposition reaction ii. reversible reaction 3a. what is Catalyst 3b. mention two types of catalysis 3c. state 3 characteristics of catalyst 4a. Explain Redox reaction 4b. identify the oxidizing agent and reducing agent, then explain the half - reaction between Zn(s) + 2Hcl(aq) --->Zncl2 (aq) + H2(g)