2017年3月29日 星期三

F2 IS 2nd Term WS05 10.1 Answers

2nd Term WS 05
Submission date_____________
Name______________________
Class & no.2 _________(     )
 
10.1    Acids and alkalis in daily life
i      Words to know:

English term
Write the words again
Chinese term
1
Acid

2
Sour

酸味的
3
Lactic acid

乳酸
4
Citric acid

檸檬酸
5
Ethanoic acid

乙酸
6
Hydrochloric acid

氫氯酸
7
Carbonic acid

碳酸
8
Alkali

9
Bitter

苦味
10
Soapy

似肥皂的
11
Slippery

滑溜的
12
Ammonia

13
Sodium hydroxide

氫氧化鈉
14
Potassium hydroxide

氫氧化鉀

i      Fill in the blanks:
1      In our daily life, there are many foods, drinks and flavourings that taste sour. It is because they contain
         acid. For example,
n   Yoghurt contains lactic acid.
n   Lemons contain citric acid.
n   Vinegar contains ethanoic acid.
2      Many household cleaners and personal care products also contain acids. For example,
n   Toilet bowl cleaners contain hydrochloric acid.
3       Alkalis are the chemical opposite of acids. They generally taste bitter, and feel soapy and slippery.
4       Besides soap, some household cleaners contain alkalis. For example,
n   Glass cleaners contain ammonia.
n   Drain and oven cleaners contain sodium hydroxide or potassium hydroxide.

i      Everyday Science:
1.       Fizzy soft drinks contain carbonic acid which is formed by dissolving carbon dioxide in water.

2.       The gastric juice (胃液) in our stomach () contains hydrochloric acid.

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