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ｚｅｒｏ仔

喔喔
明白._.

wilson1993912

碳酸鈉係咪CaCO3?
加熱既話會有thermal decomposition架wo
我岩岩睇完note,我好肯定
除非阿sir教錯

Roy

碳酸鈉係咪CaCO3?
加熱既話會有thermal decomposition架wo
我岩岩睇完note,我好肯定
除非阿sir教錯
wilson1993912 發表於 27-3-2009 17:52

你食左個Na

wilson1993912

係wo-.-
但係#10果度話睇REACTIVITY OF METAL
Na reactive過Ca點解Ca會Na唔會?

yukating

係wo-.-
但係#10果度話睇REACTIVITY OF METAL
Na reactive過Ca點解Ca會Na唔會?
wilson1993912 發表於 28-3-2009 00:03

#2解釋左........................
書有課偵測與分析,話大部分碳酸鹽可被熱分解(除K2CO3,Na2CO3)

Zend

係wo-.-
但係#10果度話睇REACTIVITY OF METAL
Na reactive過Ca點解Ca會Na唔會?
wilson1993912 發表於 28-3-2009 00:03

都係因為Na2CO3 more stable.
in fact, Li2CO3 can be decomposed by heating

講少少AL 野啦
係關個METAL ION 的CHARGE 同SIZE 時
如果太勁的POSITIVE,佢會DISTORT左ANION 的ELECTRON CLOUD, LEAD TO DECOMPOSITION OF CARBONATE ION...
所以MgCO3, CaCO3 可以分解(但我AL 做實驗, BUNSEN FLAME,整唔到分解-.- SUPPOSE 係大約６５０’Ｃ)
ALKALI　ＭＥＴＡＬ，　大部分都係１＋　ＣＨＡＲＧＥ，而ＳＩＺＥ　其實分別唔大，　所以ＥＦＦＥＣＴ　係細好多，　除左Li 真係好細之外，　其他的都好ＳＴＡＢＬＥ

但ＣＥ　來說，我認為最易記都係話如果佢ＨＥＡＴ　到的話，佢ＦＯＲＭ　的係Na2O, very reactive oxide, but CaO is relatively stable stuff , hence Na2CO3 is more stable lor, not decomposition in heating..