CE Chem 問題 [復制鏈接]

引用第14樓matthew93manutd於2010-05-05 22:10發表的“”:
peroxide?
K2O2 [表情]
.......

係丫,係K2O2

我估ox no of K係+2掛

引用第0樓matthew93manutd於2010-04-28 13:20發表的“CE Chem 問題”:
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)
.......

Q7:crystallization 出 crystal ,而crystal 係包含water 嘅salt(in solid state),evaporation 只可以出salt(in solid state)

引用第0樓matthew93manutd於2010-04-28 13:20發表的“CE Chem 問題”:
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)
.......

Q8:PUT(Fe2O3)INTO (HCL),Fe2Cl will be formed(aq),use displacement or electrolysis to extract iron

引用第0樓matthew93manutd於2010-04-28 13:20發表的“CE Chem 問題”:
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:IF IN CE, POTASSIUM RECAT WITH AIR TO FORM POTASSIUM OXIDE,WHICH IS PURPLE IN COLOUR

引用第0樓matthew93manutd於2010-04-28 13:20發表的“CE Chem 問題”:
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)
.......

Q19:唔係,GIANT COVALENT BOND 嘅SUBSTANCE 嘅PARTICLES ARE HELD BY COVALENT BOND,WHICH IS TOO STRONG (COMPARED WITH POLAR SOLVENT AND NON-POLAR SOLVENT).

    ONLY SUBSTANCE WITH SIMPLE MOLECULAR STRUCTURE IS SOLUBLE IN NON-POLAR SOLVENT AS VAN DER WAL FORCE IS COMPARABLE TO NON POLAR SOLVENT