救命...

Y+Y+Y

@@chem我地學校阿sir唔係路的,我讀文科

小莓。改

B 同 D都錯
其實這條有爭議
B : Cl2 is a gas polluting the world, which forms acid rain, break down O3 layer.
D : In some places in land such as middle Europe, the cost to obtain NaCl is relatively high, manufacturers may consider to use marble chips or other natural coals which contains Cl- to produce blench . So manufacturing buildings normally built near coastal area.

REQUIEM

B 同 D都錯
其實這條有爭議
B : Cl2 is a gas polluting the world, which forms acid rain, break down O3 layer.
D : In some places in land such as middle Europe, the cost to obtain NaCl is relatively high ...
小莓。改 發表於 29-4-2009 16:50

題目問least important
唔係not important

小莓。改

33# screen
THEN, 請判斷哪個較不重要
我就話D,不過各家說各法

Zend

我會認為係B

理論上係控制得到CHLORINE 的排放

如果係原材料成本,其實氯化鈉無論係海洋定係陸地的鹽礦都有,不過唔純.同埋唔好唔記得要先去左唔少物質先整到,其實如果要純度高的產品,其實價錢都唔會平

小莓。改

#35, 你都話左是理論,
我都明白鹽不只是在海上有,
不過在選擇上我會傾向選D
始終有錢使得鬼推磨, 但控制比獲取原材材較難

Zend

其實經濟學來看，都要看用幾多，同埋你本身個設施夠唔夠好

但high-class NaCl 真係唔平，但我又唔排除你用１g 就算數

開果Ｄ　設施反而仲哂錢

小莓。改

#37
我同意你 指出製造高純度鹽的機會成本很高, 這條的答案其實要看工廠的生產精度, 經費及營運成本。
但這不是已超出 化學 的課程範圍嗎?
所以我才說這條有爭議

幻朧

JOINT US果本SOLUTION話係D-.-
考評局果隻pastpaper話答案係咩?



我認為係B
但係本野話係D 雖然本野好多時都錯
所以想知真正答案係咩-.-
screen 發表於 29-4-2009 15:04

Marking 真正答案 係B ,joint us成日錯,我好少會睇呢本- -

理論上chlorine作為main-product係唔會被當成廢氣排出

meow喵

我睇補習答案話D囧