SBA MOCK TEST

1. A gas is a form of matter that

• has a definite volume.

• is difficult to compress.

• takes the shape and volume of its container.

• is generally a liquid or solid at room temperature.

2. Naphthalene or mothball is an example of a substance that changes directly from solid to gas without melting. This type of change is called

• condensation.

• sublimation.

• deposition.

• freezing.

3. Which of the following molecules is expected to be stable?

• NH

• NH₂

• NH₃

• NH₄

4. If atom X consists of 22 protons, 22 electrons, and 26 neutrons, what is the mass number of atom X?

• mass number = 48

• mass number = 44

• mass number = 4

• mass number = 0

5. Sulfuric acid reacts with sodium hydroxide to form sodium sulfate and water. The chemical equation is given below:

__ H₂SO₄ + __ NaOH → __ Na₂SO₄ + __ H₂O

What is the sum of the coefficients when you balance the equation?

• 4

• 6

• 8

• 10

6. Which of the following is the correct electron configuration of Ca²⁺ ion?

• 1s² 2s² 2p⁶

• 1s² 2s² 2p⁶ 3s²

• 1s² 2s² 2p⁶ 3s² 3p⁶

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

7. In an experiment to determine the unknown substance, Mary used a universal indicator to determine the pH of the substance. When she compared it to the pH color range, it was determined that the substance has a pH of 5. Mary concluded then that the unknown substance is a

• weak acid.

• weak alkali.

• strong acid.

• strong alkali.

8. Three moles of aluminum are added with excess hydrochloric acid. How many moles of hydrogen gas are produced?

2Al + 6HCl → 2AlCl₃ + 3H₂

• 3.0 moles

• 3.5 moles

• 4.0 moles

• 4.5 moles

9. How many H atoms are in 3.4 g of C₁₂H₂₂O₁₁?

(Atomic Mass C=12; H=1; O=16)

• 6.0x10²¹

• 3.8x10²²

• 1.3x10²³

• 6.0x10²³

10. Burning of fossil fuels during combustion produces harmful gases. Which of the following products of combustion is responsible for the formation of acid rain?

• Sulfur dioxide

• Carbon dioxide

• Nitrogen oxide

• Carbon monoxide