F2 IS 2nd Term QZ 08: 10.5 anwers

10.5

Word Translation (10 marks)

i    Write down the English terms of the following Chinese terms:

	Chinese term	English term
1	酸雨	Acid rain
2	催化轉化器	Catalytic converter
3	煤	Coal
4	溶解	Dissolve
5	燃料	Fuel
6	氮氧化合物	Nitrogen oxides
7	石油	Petroleum
8	污染物	Pollutant
9	發電廠	Power station
10	硫 / 二氧化硫	Sulphur / Sulphur dioxide

Multiple Choice (5 marks)

Circle the letter of the best answer for each question.

1.       Which of the following is the approximate pH value of clean rainwater?

A.   3.0                           B.    5.6                           C.    7.0                           D.    9.2

2.       Which of the followings are the sources of acidic pollutant gases in the air?

(I)           Motor vehicles

(II)         Hydro-electric power stations

(III)        Factories

A.   (I) and (II) only       B.    (I) and (III) only    C.    (II) and (III) only    D.    (I), (II) and (III)

 3.     Which of the following release the largest amount of acidic pollutant gases in Hong Kong?

A.   Traditional power stations                       B.    Factories

C.   Motor vehicles                                       D.    Households

4.       Which of the following are the effects of acid rain?

(I)           Corrode buildings and structures made of metals, marble and limestone

(II)         Make soil more suitable for the growth of plants

(III)        Kill fish in lakes and rivers

A.   (I) and (II) only       B.    (I) and (III) only    C.    (II) and (III) only    D.    (I), (II) and (III)

5.       Which of the following will NOT be damaged by acid rain?

A.   Marble statue

B.   Limestone building

C.   Plant leaf

D.   Copper water pipe

Fill in the Blanks (13 marks)

1        Rainwater with the pH value below 5.6 is regarded as (1) acid rain. It is mainly caused the

(2) pollutant gases like (3) Sulphur dioxide and nitrogen oxides,

which are released from traditional (4) power station and factories.

2        When (5) fuels are burnt in factories, and (6) petroleum are

burnt in engines of motor vehicles, pollutant gases are released. The gases (7) dissolve in

tiny water droplets in the air to form acidic clouds in the atmosphere.

3        Acids have (8) corrosive effects on some metals and building materials. They may

also damage leaves and make plants unable to carry out (9) photosynthesis.

4        Many fish and plants die if the pH value of water drops below (10) 5.

5        To reduce the emission of acidic pollutant gases, we should use alternative energy sources like

(11) solar / nuclear power and wind power.

7.        For driving, we should use high-grade fuels with a low (12) sulphur contents.

We can also reduce pollutants from the exhaust gas of motor vehicles by using

(13) catalytic converter.

Challenging Questions (Bonus 2 marks)

1.      Suggest how you can determine whether the rainwater is acid rain or not.

We can use pH meter to test for the rainwater. If the pH value is lower than 5.6, the rainwater is acid rain.

__________________________________________________________________________________

2.      What happens if the acidic rainwater drops on the marble floor?

The marble floor will be corroded.

F2 IS 2nd Term QZ 07: 10.4 anwers

10.4

Word Translation (8 marks)

i    Write down the English terms of the following Chinese terms:

	Chinese term	English term
1	碳酸鈣	Calcium carbonate
2	腐蝕 (動詞)	Corrode
3	腐蝕 (名詞)	Corrosion
4	腐蝕性的	Corrosive
5	氫	Hydrogen
6	石灰石	Limestone
7	大理石	Marble
8	爆鳴聲	‘Pop’ sound

Fill in the Blanks (8 marks)

1        Some metals react with dilute acids and give out (1) hydrogen and heat. During the

reaction, the metals decrease in size, showing that acids have (2) corrosive effect on these metals.

2        The gas produced in the reaction between acid and some metals can be tested by a burning splint.

The gas burns with a (3) ‘pop’ sound.

3        We should not use acidic detergents to clean the surfaces of some building materials such as

(4) marble / limestone and (5) limestone / marlbe, because both of them contain

(6) calcium carbonate which is easily (7) corroded by acids.

The gas produced in the reaction is (8) carbon dioxide.

Multiple Choice (5 marks)

Circle the letter of the best answer for each question.

1.    When magnesium strip is added to dilute hydrochloric acid, gas bubbles are given out.

The gas can

A.   relight a glowing splint.

B.   turn hydrogencarbonate indicator yellow.

C.   give a ‘pop’ sound with a burning splint.

D.   turn lime water milky.

2.       Which of the following metals react(s) with dilute acids?

(I)   Zinc                                 (II)   Magnesium                              (III) Copper

A. (I) only              B. (I) and (II) only         C. (II) and (III) only       D. (I), (II) and (III)

3.       Which of the following metals reacts the most vigorously with dilute hydrochloric acid?

A.   Zinc                 B.    Magnesium            C.    Copper                    D.    Iron

  

4.       Which of the following is the gas given off when limestone pieces are added to dilute sulphuric acid?

A.   Hydrogen

B.   Oxygen

C.   Chlorine

D.   Carbon dioxide

5.       Which of the following building materials react(s) with dilute acids?

(I)   Marble                     (II)   Limestone                       (III) Iron

A. (I) only              B. (I) and (II) only          C. (II) and (III) only       D. (I), (II) and (III)

Challenging Questions (Bonus 2 marks)

1.      Explain why we should not use metal saucepans to cook “pork trotters in vinegar sauce”.

Vinegar contains acid (ethanoic acid) that may corrode the metal saucepans.