F2 IS 2nd Term QZ 05: 10.1 & 10.2 anwers

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

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.