本人是小四學生，有幾個功課問題是關於鹽和糖溶解於水，急於請大家幫忙：
1. 為什麼水溫越高，能溶解物質的份量越多?
2. 於同一度的水中，為什麼糖溶於水中的量比鹽溶於水中的量多?
3. 水能溶解許多物質，這持性對我們有什麼重要呢?
有勞!謝謝!

Poor Child, Only P4 need to know what is solution

這真的是小四的功課嗎??

放在 AL 作為題目也可能有很多人答錯

P4 or F4?

真的是小學四年級(P.4)，是今天的常識功課，媽媽話唔識答，上網又找不到，現在要四處問人......真可憐......>.<

不敢相信這是小四題目....

我係小學老師,小四怎會有這些題目,邊間小學呀?邊一科?常識唔會問咁深

1:所謂溶解,就是將物體分解。水溫越高,energy(heat energy)越大,越容易break開分子結構,所以能溶解物質的份量越多。
2:因為糖係一種simple molecular structure,結構較弱,melting point and boiling point 較低(simple molecular structure的特性!!!),所以不需要太大熱能來分解結構。鹽係一種Giant ionic structure,結構較強,melting point and boiling point 較高(Giant ionic structure的特性!!!),需要較大熱能來分解結構
3:自己諗諗la~~
請自行美化答案
本人中四EMI理科生,希望help到你,各位有錯請指點!!!~
樓主如果有model answer請打上黎!!

睇完你ge回答,
令我清楚明白我ge化學水平連小學都無 - -


fuse:
仲有攪拌水都可加快溶解速度~

I think you are wrong.

Solubility mainly depands on the balance of intermolecular force between solvent and solute.

Simple molecular structure's molecules NOT always have high solubility in water. (eg C6H6) If the intermolecular force between solvent is lager than solute's , the solubility is low.

The reason for high solubility of sugar(sucrose)  is that it has lots of
-OH bond in its structure and it is polarized. So its intermolecular force is simular to water's.

Also, ionic compounds often have high soluility because the polar solvent H2O can ionize ionic compounds.(But for OH- / O2- , usaually not)


PS. Who says higher tem, higher soluility?? It seems wrong. (consider Ca(OH)2 )



Sorry for poor english and 有錯請指正.