which of the following substances will cause effervescence when put into dilute hydrochloric acid??
(1)zinc
(2)calcium oxide
(3)sodium carbonate
(4)copper(II)sulphate
答案係1同3,,,
我知3係答案.....係因為carbonate+HCL會出CO2....所以cause effervescence...
但係ZINC點解都係既?!ZINC+HCL出SALT同H2....但係無CO2啵!
effervescence既問題!!
2006-12-31 9:48 pm
回答 (2)
2007-01-01 2:03 am
✔ 最佳答案
when Zinc react with HCl, salt and hydrogen wil form:2Zn(s)+2HCl(aq) -> 2ZnCl(aq)+2H(g)
because HCl is an aqueous solution, bubbles will form
that means effervescence will happen
參考: myself
2006-12-31 9:52 pm
氫氣(H2)是氣體,跟CO2一樣有氣泡在溶液中產生,即是effervescence.
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061231000051KK01870