想問吓
1.NaOH(s)-->NaOH(aq)
2.HCI(g)-->HCI(aq)
點解第一個果個係physical change,第二果個係chemical change...?
大家都係就冇water變ions傘,可唔可以講吓有咩分別?
2007-02-12 19:38:42 · 2 個解答 · 發問者 2003 2 in 科學 ➔ 化學
樓上條式好明顯係唔balance...更加唔會出現~~
這是Cl2溶水的式~
NaOH(s)本身係ionic bond~溶左落水都係變番ion~
HCl本身係covalent bond...溶左落水變ion~
個bonding唔同左~所以係chemical change~因為涉及化學本質的改變~
HCl同(H+ + Cl-)化學上係唔同的~兩個force都唔同啦~
但NaOH同(Na+ + OH-)就係一樣~只係個ion有冇痴埋咁解~
而且HCl溶落水嚴格上係
HCl (g)+ H2O(l) ---> H3O+(aq) + Cl-(aq)
你都可以睇到有咩分別~不過未學到呢part就唔使理啦~
2007-02-13 06:16:06 · answer #1 · answered by Chi Ching 3 · 0⤊ 0⤋
NaOH --------->Na+ & OH-
呢個只你dissolve in water
同一般NaCI dissolve in water 一樣
而HCI dissolve in water
HCI +H2O -------->HCI+HOCI
呢個HCI同水有chemical reaction
唔係ionization 而係chemical reaction
2007-02-12 19:44:49 · answer #2 · answered by Terry 2 · 0⤊ 0⤋