識Chemistry既請進`=) (英文)

☆★精靈♀天使★☆

2009-03-04 2:57 am

請各位解答以下既問題`=)
重點係要重英文答`=)
幫幫手呀唔該`
因為要交功課`
thx a lot`=)
1. Name two inert gases.
2.Town gas originally has no smell.Why the town gas daily used possesses a special smell?
3.What is the electronic arrangement of potassium?
4. What is the color of chlorine gas?
5.Give one use of silicon.
6.How to store reactive metal such as sodium in the school loboratory?
7.What is the most abundant gas in air?
8.Suggest a test for hydrogwn gas.
9.What is the meaning of boiling point?

回答 (1)

老爺子

2009-03-04 3:36 am

✔ 最佳答案

1.
Any two out of :
helium, neon. argon, krypton, xenon, radon

2.
An odorant (e.g. dimethyl sulphide, DMS) is added to town gas. Therefore, people can be alerted in case of town gas leakage.

3.
2, 8, 8, 1

4.
pale yellowish green

5.
Silicon is used as a semi-conductor (e.g making transistors or making integrated circuits).

6.
The metal is stored in paraffin oil.

7.
nitrogen

8.
Hydrogen burns with a pop sound.

9.
Boiling point of a substance is the temperature at which the substance changes from liquid to gas (or from gas to liquid) constantly under a certain pressure.
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