10-minute Quiz : Chapter 2 The atmosphere

The table below shows the composition of gases in the atmosphere of planet X. Compared with the Earth’s atmosphere, which of the following gases have a higher percentage by volume in the atmosphere of planet X?

(1) Carbon dioxide

(2) Nitrogen

(3) Oxygen

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

Sulphur dioxide is an air pollutant that causes acid rain. Which of the following statements is/are the correct description(s) of the physical properties of sulphur dioxide?

(1) It is soluble in water.

(2) It is insoluble in water.

(3) It is a gas at room temperature.

• A. (1) only
• B. (2) only
• C. (1) and (3) only
• D. (2) and (3) only

When dry ice is heated, it changes directly from the solid state to the gaseous state. Which of the following statements concerning this process are correct?

(1) This process is known as sublimation.

(2) This process is a physical change.

(3) Heat is absorbed in the process.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

Copper reacts with oxygen to give copper(II) oxide. A sample of air is passed over hot copper until the reaction is complete. The diagram below shows the set-up of the experiment. The volume of gas decreases by 30 cm³. What is the initial volume of the sample of air?

• A. 60 cm³
• B. 100 cm³
• C. 150 cm³
• D. 300 cm³

Which of the following statements concerning the fractional distillation of liquid air are correct?

(1) It involves a physical change.

(2) Air is cooled and expanded repeatedly.

(3) Carbon dioxide can be collected from the fractionating column.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

An ice cube is completely melted into water. It is a physical change because

• A. the ice cube disappears completely.
• B. water forms.
• C. no new substances form.
• D. heat is absorbed in the process.

Oxygen can be used in oxy-acetylene torch for cutting and welding metals because

• A. oxygen is flammable.
• B. oxygen supports combustion.
• C. oxygen can relight a glowing splint.
• D. oxygen can be found in air.

Which of the following diagrams represents the arrangement of particles inside a gas jar containing a mixture of nitrogen and oxygen? (Hint: both nitrogen and oxygen are diatomic molecules.)

• A
• B
• C
• D

Which of the following statements concerning air are correct?

(1) It is a mixture of colourless gases.

(2) The gases in air have different boiling points.

(3) It has a fixed composition.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only

• D. (1), (2) and (3)

Which of the following statements concerning compounds are correct?

(1) They can be made from other compounds.

(2) They have sharp melting points.

(3) They are pure substances.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)