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反傳統 2007-12-01 12:16

hkcee phy mc

2.    A beaker of ether is placed in a dish of water. When air is bubbled through the ether, the water freezes because        (1989-17)

A.    energy required to force air through the ether.
B.    the speed of the molecules of ether is increased by the process of bubbling.
C.    the specific heat capacity of air is very large.
D.    the freezing point of ether is very low.
E.    ether absorbs energy from the water during evaporation.

which answer should be?
can anyone explan/.\

siman 2007-12-01 12:48
直覺話我聽係E

因為A-D 都無講過water

豬脾 2007-12-02 12:22
好似真係E
A.唔知佢up咩
B.就算ether既temp(ke)真係升左,都explain唔到點解water freeze
C.change of state 點都唔關s h c 事啦
D.如果ether freeze左,water點freeze
E.正確ans 掛

夢冰月天 2007-12-08 02:57
2.   A beaker of ether is placed in a dish of water. When air is bubbled through the ether, the water freezes because     (1989-17)

A.   energy required to force air through the ether.
d energy又唔係d水比佢, 係bubble d air入去果條油比佢

B.   the speed of the molecules of ether is increased by the process of bubbling.
外來物比energy d ether, 令ke升左, 中間d ether熱左, 有咩理由出面d水仲會凍左

C.   the specific heat capacity of air is very large.
係睇temperature, 而唔係specific heat capacity,   加上...air is very large已經係膠句, 水仲高過air多多聲啦


D.   the freezing point of ether is very low.
咁就ether結冰啦, 幾時倫到d水

E.   ether absorbs energy from the water during evaporation.
ether 係揮發性好高, 勁易有evaporation, evaporation要抽surrounding既energy, 即係水既energy都比佢抽


講完

反傳統 2007-12-08 15:48
引用第3樓夢冰月天於2007-12-08 02:57發表的“”:
2.   A beaker of ether is placed in a dish of water. When air is bubbled through the ether, the water freezes because     (1989-17)
A.   energy required to force air through the ether.
d energy又唔係d水比佢, 係bubble d air入去果條油比佢[表情]
.......

明啦..謝謝


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