CE Chem 問題 [復制鏈接]

Q7) Difference between crystallization and evaporation?(in terms of crystal) WHY?
Q8) extraction of iron from Haematite(Fe2O3)<---- out syll???
Q13 有D咩要store係brown bottle (HOCl, HNO3之外)

Q15 Oxidation Number of Fe and S in iron pyrite?(FeS2)

Q17 Potassium   同air react 出咩? 我本書寫出Potassium superoxide? 補習notes寫話出Potassium oxide?出邊隻?
以上所講既兩種oxide係咩色?

Q19 有Giant covalent structure的compound係唔係soluble in organic solvent?(書寫insoluble in any solvent, notes寫non-polar solvent係得既

Q20 點分polyester同nylon?_?(except peptide bond)[/color]

1a: 因為人體要ions做respiration
(Chloride is a chemical the human body needs for metabolism (the process of turning food into energy).[1] It also helps keep the body's acid-base balance.)
wiki

c: H+ 影響血既ph值


咁bio既

Q14: 前者(macromolecules)

Q16:Fe2O3 + 2Al → 2Fe + Al2O3 +*heat*

Q19(唔肯定):睇下係邊隻架咋喎

Q20:polyester 係O-O, nylon 係C-N?

polyester冇N?

引用第2樓智者於2010-04-28 13:39發表的“”:
Q14: 前者(macromolecules)
Q16:Fe2O3 + 2Al → 2Fe + Al2O3 +*heat*
Q19(唔肯定):睇下係邊隻架咋喎
.......

引用第2樓智者於2010-04-28 13:39發表的“”:
Q14: 前者(macromolecules)
Q16:Fe2O3 + 2Al → 2Fe + Al2O3 +*heat*
Q19(唔肯定):睇下係邊隻架咋喎
.......

Q14: thermosetting plastics are also marcomolecules?

引用第4樓matthew93manutd於2010-04-28 13:59發表的“”:
Q14: thermosetting plastics are also marcomolecules?

yes

Q17 Potassium   同air react 出咩? 我本書寫出Potassium superoxide? 補習notes寫話出Potassium oxide?出邊隻?
以上所講既兩種oxide係咩色?


其實三種oxide都有可能出
要睇下有幾多O2

Q7) Difference between crystallization and evaporation?(in terms of crystal) WHY?


crystallization出water of crystalization
要用hot conc solution等佢慢慢cool down形成crystal

evaporation將水or solvent完全蒸走
形成唔到crystal

引用第7樓vincent於2010-05-01 17:20發表的“”:
Q7) Difference between crystallization and evaporation?(in terms of crystal) WHY?
crystallization出water of crystalization
要用hot conc solution等佢慢慢cool down形成crystal
.......

而家已經考完哂

引用第8樓丹尼屎於2010-05-01 17:29發表的“”:
而家已經考完哂 [表情]

當識多少少野囉

有冇出中上面哥d先

引用第9樓vincent於2010-05-01 17:32發表的“”:
當識多少少野囉
有冇出中上面哥d先

exactly 就無既 ...

有少少差唔多既題目啦~

引用第10樓丹尼屎於2010-05-01 17:37發表的“”:
exactly 就無既 ...
有少少差唔多既題目啦~

我做緊份mc

引用第6樓vincent於2010-05-01 17:16發表的“”:
Q17 Potassium   同air react 出咩? 我本書寫出Potassium superoxide? 補習notes寫話出Potassium oxide?出邊隻?
以上所講既兩種oxide係咩色?
其實三種oxide都有可能出
.......

3種 ?_?

引用第12樓matthew93manutd於2010-05-02 21:29發表的“”:
3種 ?_? [表情]

normal oxide
peroxide
superoxide

引用第13樓vincent於2010-05-04 14:01發表的“”:
normal oxide
peroxide
superoxide

peroxide?

K2O2

i havent heard of them

p.s. what is the oxidation number of K in potassium superoxide?