Science 2nd quarter Grade9

1. When does covalent bonding take place?

• a. it takes place when atoms share electrons with one another

• b. it takes place when the attraction between two atoms are strong

• c. It takes place when atoms collide with one another

• d. it takes place when atoms attain stability

2. How many types of bonds can a carbon atom form

• a. 1

• b. 2

• c. 3

• d. 4

3. How does ionic bonding take place?

• a. Two non metallic elements of different kinds form strong forces of attraction

• b. Two non metallic elements of same kind form strong forces of attraction

• c. A non metal like F is attracted to a metal like Na

• d. A metal element like Na transfers an electron to a non metal element like F

4. Carljohn's car stopped in the middle of the road. He found out that his car ran out of fuel. Which compound must he buy?

• a. kerosene

• b. gasoline

• c. lubricating oil

• d. water

5. Why do atoms react with one another to form chemical bonds?

• a. to attain stability

• b. to form compounds

• c. to form molecules

• d. to produce ions

6. It refers to the tendency of atoms to prefer to have eight electrons in the outermost shell to gain stability.

• a. Lewis Dot

• b. Octet Rule

• c. Bohr's Rule

• d. none of the above

7. It is formed whenever two or more elements combine

• a. acid

• b. base

• c. compounds

• d. all of the above

8. Which organic compound is used as a cleaning agent?

• a. gasoline

• b. kerosene

• c. liquefied petroleum gas (LPG)

• d. ethyl alcohol

9. Which of these contains 7 orbitals?

• a. s

• b. p

• c. d

• d. f

10. It is the weakest form of energy level?

• a. The one near the nucleus

• b. The farthest from the nucleus

• c. The middle of the orbits

• d. none of the above