化學其他 DSE、CE 選擇題（第 6 頁）

51.

Obtaining energy from the sun provides many advantages over that from combustions of fossil fuels. The diagram below shows a closed system which can be used to convert solar energy to heat energy by means of two chemical reactions.

The gases in the diagram are circulated around the system. Energy is stored by means of Reaction I and later released by means of Reaction II.

What are the advantages of obtaining energy from the sun over that from combustion of fossil fuels?

(1)Supply of solar energy is unlimited.

(2)Solar energy is always available.

(3)Using solar energy produces no waste products.

52.

Obtaining energy from the sun provides many advantages over that from combustions of fossil fuels. The diagram below shows a closed system which can be used to convert solar energy to heat energy by means of two chemical reactions.

The gases in the diagram are circulated around the system. Energy is stored by means of Reaction I and later released by means of Reaction II.

Which of the following energy conversions is involved in the system?

53.

Obtaining energy from the sun provides many advantages over that from combustions of fossil fuels. The diagram below shows a closed system which can be used to convert solar energy to heat energy by means of two chemical reactions.

The gases in the diagram are circulated around the system. Energy is stored by means of Reaction I and later released by means of Reaction II.

Which of the following statements concerning the system are correct?

(1)Reaction I is endothermic.

(2)SO₂(g) and O₂(g) should be pumped into Reaction Tank II from time to time.

(3)A catalyst is required in Reaction Tank II.

54.

For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.

A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

C.The 1st statement is false but the 2nd statement is true.

D.Both statements are false.

1st statement	2nd statement
Anodization is a method used to enhance the corrosion resistance of aluminium.	By anodization, an oxide layer is formed to protect the aluminium.

55.

For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.

A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

C.The 1st statement is false but the 2nd statement is true.

D.Both statements are false.

1st statement	2nd statement
Polyester is an addition polymer.	Polyester softens on heating.

56.

For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.

A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

C.The 1st statement is false but the 2nd statement is true.

D.Both statements are false.

1st statement	2nd statement
2 M hydrochloric acid reacts faster with 1 g of zinc granules than with 1 g of zinc powder.	The surface area of 1 g of zinc powder is larger than that of 1 g of zinc granules.

57.

Which of the following substances is the poorest electrical conductor ?

58.

Which of the following statements concerning nitric acid is correct?

59.

Which of the following combinations concerning the properties of gases is INCORRECT ?

	Gas	Property
	Ammonia	has an irritating odour
	Methane	dissolves readily in water
	Carbon monoxide	can burn in air
	Nitrogen monoxide	changes from colourless to brown when exposed to air

60.

Which of the following reagents can be used to distinguish sodium bromide solution from sodium chloride solution ?