2024 FIRST TERM EXAMINATION ON CHEMISTRY SS1

1.The aspect of chemistry that deals with the study of carbon and its compound is called

2. Which of the following is NOT an adverse effect of chemistry?

3. Which of the following changes is a chemical change?

4. When a solid changes to gas directly, this process is called

5. Which one of the following has a fixed shape and volume?

6. The combing power of calcium is

7. Which of the following is a metalloid?

8. The symbol Au represents

9. Which of the following is a mixture?

10. Which of the following is a compound?

11. The formula for Calcium trioxocarbonate(iv) is

12. The atomic number of an element is precisely _______

13. Which element has 2,8,3 as electronic configuration?

14. Atomicity of Ozone is

The percentage of oxygen in Calcium tetraoxosulphate (vi), CaSO4 is ( Ca=40 S=32, O=16)

16. The simplest unit of matter that retains its properties is called

17. Give IUPAC name of this compound; CO2

18. Compounds are always

. Which of the following is NOT a constituent of the atom?

20. _______ is applied in our everyday life as different activities take place in our environment

1._______ is used to measure the mass of an atom.

2. ______ state of matter that has definite volume but no fixed shape

3. _______ is the full meaning of IUPAC

4. ________ is a type of mixture that exists in one phase as a solution

5. ________ is used to represent compounds.

6. _______ and 7. ______ are examples of radicals

8. ______ and 9. _________ are types of changes.

10. _______ is the unit of relative molecular mass of an element.

ESSAY ANSWER 4 QUESTIONS ONLY

1a.Explain Chemistry 1b. Mention 5 laboratory apparatus/ equipment 1c. Differentiate between Rusting and Burning

2a. What is an Element? 2b. List and explain 2 classes of elements 2c. Explain Valency

3a. What is Electronic Configuration? 3b. Using Shell format; show the electronic configuration of i. Fluorine ii Argon 3c. Explain Isotope

4a. State the Law of Conservation of Matter 4b. Balance these equations i. C2H6 + O2 >> CO2 + H2O ii. HCl + Na2CO3 >> NaCl + H2O + CO2 4c. What is a Mixture?

5a. An element has 4 electrons and 5 neutrons. Find a. the atomic number b. the mass number c. write the name of the element 5b. Find the relative molecular mass of Magnesium tetraoxosulphate(vi), MgSO4. ( Mg = 24, S = 32, O = 16 ) 5c. What is a Compoud?