CHEM,CHEM,CHEM,CHEM-------easy mc x3

思

2007-01-14 11:04 pm

mc x3

氮的用途非常廣泛，
(1)可用於包裝食物以防此由空氣產生的有害反應
(2)可用於冷凍劑在極低温下儲存物質
(3)可用於製造氨，以用來生產肥料
A.(1)(2)
B.(1)(3)
C.(2)(3)
D.(1)(2)(3)

下列那項昰水的化學性質?
A.在常溫常壓下水會在100度沸騰
B.在常溫常壓下油會浮在水之上
C在常溫常壓下水導致鐵生鏽
D.在常溫常壓下水是無色液體

wHICH OF THE FOLLOWING IS a chemical change?
A dry ice sublimes to became carbin dioxide gas
B dissolving salt in water to give a salt solution
C. Burning magnesium in air
D melting of wax in a burning candle

答案準確者得分!!!!!!!!!!!!!!!!!!

回答 (2)

羊咩咩

2007-01-14 11:39 pm

✔ 最佳答案

1. D

(1) & (2) Nitrogen provides a chemically inert environment as it is stable.

(3) Ammonia is manufactured by Haber process

哈伯-博施法：在200大氣壓力和500℃的環境，以氧化鐵為催化劑，加熱氮氣和氫氣。

Fertilizers are made by ammonia. Example

nitric acid + ammonia --> ammonium nitrate

2. C

A,B,D are waters physical properties, because it does not involve formation of new substances

3. C

Magnesium + oxygen --> magnesium oxide

Observation--> a white powder is formed + dazzling white light

參考: my brain

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Howard Liang

2007-01-14 11:40 pm

d
c
b

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