1)為什麼metals+water (XXX+H2O) ---> metals hydroxide+hydrogen(XXXOH+1/2H2)會多
左個hydrogen 出來,但到頭來又要乘1/2?(咁不如一早唔要個hydrogen??!!!!!)
2)metals+water (XXX+H2O)---> metals hydroxide+hydrogen(XXXOH+1/2H2)同
metals+steam (XXX+H2O)---> metals oxide+hydroxide(XXXO+H2)点解不一樣?
(兩個都係由水出來的,点解react左之後個equation會唔同左?
F.3 chemistry-- urgent!!!!!!!!!!!
2007-03-20 3:00 am
回答 (2)
2007-03-20 4:46 am
✔ 最佳答案
1.Ca+2H2O-->Ca(OH)+H2
2Na+2H2O-->2NaOH+H2
因為atom ge outermost shell full左先穩定
所以H就要以H2出現先STABLE
2.
聽我chem miss講metal同水作用
力唔夠大 只可以拆開1粒hydrogen
所以係metal hydroxide
同steam作用由於溫度高d
兩粒hydrogen都可以拆走
所以係metal oxide
參考: ME&MY CHEM MISS
2007-03-20 4:23 am
1) metal+water只係 form metal oxide
唔會 form metal hydroxide的!
eg. 2Na+H2O--->Na2O+H2
唔會 form metal hydroxide的!
eg. 2Na+H2O--->Na2O+H2
收錄日期: 2021-05-03 12:00:42
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