F2 IS 2nd term Test 01 (10-10.3) ans

2nd Term Test 01: 10.1 – 10.3

Test 10.1 – 10.3

Concept Checking (11 marks)

1	2	3	4	5	6	7	8	9	10
T	F	F	F	T	T	F	F	T	F

2.     Tea does not taste sour, but it contains acids

3.     All substances can be classified into three groups: acids, alkalis and alkaline substances.

4.     Both acids and alkalis are irritant and corrosive.

7      Table salt solution cannot turn red litmus paper blue (as it is neutral).

8.     A neutral substance has a pH value equal to 7.

10.   Some substances have pH values lower than 0 and higher than 14.

Multiple Choice (13 marks)

1	2	3	4	5	6	7	8	9	10
B	C	D	B	C	D	D	C	A	D

11	12	13	14
C	B	B	D

Fill in the Blanks

1.   (a)                            sour                          

      (b)                           lactic                         

      (c)                            citric                         

2.   (a)                   eye-wash bottle                 

      (b)                slow running water              

3.   (a)                            blue                          

      (b)                             red                           

4.   ___                      pH meter                      

5.   (a)                             low                          

      (b)                       low acidity                    

6.   (a)                   litmus paper                      

      (b)                           red                             

7.   (a)                  safety goggles                     

      (b)                        gloves                           

Short Question

(a)    He can identify dilute hydrochloric acid (1), because only it turns blue litmus paper red (1),

while the three other solutions do not change the colour of blue litmus paper (1).

(b)  He can identify distilled water (1), because it does not change the colours of both red and 

      blue litmus paper (1), while the two other solutions turn red litmus paper blue (1).          

(c)  He can identify the two remaining solutions (1), because dilute sodium hydroxide has  

      a higher pH value than dilute ammonia solution (1).                                                          

F2 IS 2nd term QZ 06 (10.3) ans

QZ 06: 10.3

Word Translation (11 marks)

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

	Chinese term	English term
1	天然的	Natural
2	指示劑	Indicator
3	石蕊試紙 / 溶液	Litmus paper / solution
4	酸性的 / 酸度	Acidic / acidity
5	鹼性的 / 鹼度	Alkaline / alkalinity
6	中性的	Neutral
7	通用指示劑	Universal indicator
8	程度	Degree
9	pH試紙	pH paper
10	pH值	pH value
11	pH標度	pH scale

Fill in the Blanks (13 marks)

1        Some deeply coloured plants show different colours in acids and alkalis. They can be used to make

(1)natural acid-alkali (2)indicator.

2        If something turns blue (3)litmus paper red, it is said to be (4)acidic.

3        Distilled water does not change the colours of both blue and red litmus paper. It is said to be (5)neutral.

4    (6)Alkaline substances turn red litmus paper blue but do not change the colour of blue litmus paper.

5    (7)Universal indicator can show the degree of acidity or (8)alkalinity of a substance. Its paper form is called (9)pH paper.

6     The scale for measuring acidity or alkalinity is called (10)pH scale. An acid has a (11)pH value smaller than 7 while that of an alkali is greater than 7.

5     The lower the pH value, the more (12)acidic a substance is;

       The higher the pH value, the more (13)alkaline it is.

Challenging Questions (Bonus 2 marks)

1.      State a common food which as a pH value lowers than 7.

Lemon (OR any other reasonable acidic food)

2.      If sodium hydroxide is mixed with universal indicator, what happens?

The indicator turns blue or violet.

F2 IS 2nd term QZ 05 (10.1-10.2) ans

Marks: =       /33 =    %

2nd Term QZ 05 Submission date：_____________ Name：______________________ Class & no.：2 _________(     )

10.1 & 10.2

Word Translation (16 marks)

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

	Chinese term	English term
1	酸	Acid
2	乳酸	Lactic acid
3	檸檬酸	Citric acid
4	乙酸	Ethanoic acid
5	氫氯酸	Hydrochloric acid
6	苦	Bitter
7	似肥皂的	Soapy
8	氨	Ammonia
9	氫氧化鈉	Sodium hydroxide
10	氫氧化鉀	Potassium hydroxide
11	硫酸	Sulphuric acid
12	硝酸	Nitric acid
13	氫氧化鈣	Calcium hydroxide
14	氨溶液	Ammonia solution
15	腐蝕性	Corrosive
16	安全措施	Safety precautions

Fill in the Blanks (17 marks)

1        In our daily life, there are many foods, drinks and flavourings that taste sour. It is because they

contain (1) acid: yohurt contains (2) lactic acid, lemons contain (3) citric acid, vinegar contains (4) ethanoic acid.

2        Many household cleaners and personal care products also contain acids. For example, toilet bowl cleaners contain (5) hydrochloric acid

3    (6) Alkalis are the chemical opposite of acid. They generally taste (7) bitter and feel (8) soapy or slippery. They are also commonly found in many household

cleaners. For example, glass cleaners contain (9) ammonia, drain and oven cleaners

usually contain (10) sodium hydroxide or (11) potassium hydroxide.

4    The common acids used in the laboratory include hydrochloric acid, (12) sulphuric acid and (13) nitric acid.

5   The common alkalis used in the laboratory include sodium hydroxide solution, potassium hydroxide solution, (14) calcium hydroxide and (15) ammonia solution.

6     Both acids and alkalis are irritant and (16) corrosive.

7    We should follow the (17) safety precautions when handling acids and alkalis in the laboratory.

Challenging Questions (Bonus 2 marks)

1.      What is the taste of acid? It tastes sour.

2.      What should we do when handling acids and alkalis in the laboratory? State ONE.

We should wear goggles and gloves /

We should not use too much acids or alkalis at a time.

We should not pour chemical waste containing acids or alkalis into the sink.