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Messages 9025 - 9054 of 13930   Oldest  |  < Older  |  Newer >  |  Newest
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9025
... I don't believe it is possible to selectivly separate metals using electrolysis. The negative lead attracts positive ions reguardless of any individual...
rogersieloff
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Nov 1, 2005
9:03 pm
9026
I was taught in school that it is possible to selectively separate metals by electrolysis. Copper is commercially purified by casting the impure copper which I...
brianejensen
brianedwardj...
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Nov 2, 2005
2:06 am
9027
in my research i have dissolved some very insoluable Pd compounds. Use about a 3:2 ratio of ammonia chloride and ammonium chloride at about 1x10^-5 Molar in...
pete
peteshablonski
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Nov 2, 2005
5:39 am
9028
a method to tell if a "silver ring" actually contains surface silver would be through the use of SEM-EDXRA. Energy dispersive x ray analysis allows for the...
pete
peteshablonski
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Nov 2, 2005
5:46 am
9029
... metals by electrolysis. Copper is commercially purified by casting the impure copper which I think would need to be the positive electrode or anode. This...
rogersieloff
Offline
Nov 2, 2005
9:41 pm
9030
Roger is correct that these are not good examples because one metal does not go into solution. I don't know of any commercial process where a mixture of ...
brianejensen
brianedwardj...
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Nov 2, 2005
10:50 pm
9031
Free Subscriptions! As a valued member of the community, we would like to extend the opportunity to subscribe to industry leading publications. There are...
Zamalin Folcon
zamalin_folcon
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Nov 3, 2005
2:07 pm
9032
Hello, I really want to learn what will occur if iron makes reaction with diute nitric acid and conc. nitric acid. What is the difference of poducts? I know...
AYSEGUL SENTUG
a137a137
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Nov 3, 2005
3:30 pm
9033
I don't usually post anything since there are a lot of knowledgable people on the list. Unfortunately, some statements need to be addressed. Roger stated "I...
Lance Corey
ldcorey22
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Nov 3, 2005
3:43 pm
9034
... silver stayed in solution." . Roger, I have never seen a solution of silver metal (or any other metal), except for suspensions. Most of the solutions I've...
rogersieloff
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Nov 3, 2005
6:52 pm
9035
John answered for the first point. For the second one, phosphines, unlike amines, have fixed configurations around the P atom (no 'flip-flap'). Hence, in their...
breizh_cymru
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Nov 3, 2005
7:57 pm
9036
The electrochemical separation will be really efficient (this type of separation is always possible, but sometimes too low for industrial purposes, excepted if...
breizh_cymru
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Nov 3, 2005
8:08 pm
9037
With dil. solution, iron is completely 'killed' (oxidated), as in conc. one, iron is passivated. One could stand this as in the first case the oxidation is...
breizh_cymru
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Nov 3, 2005
8:22 pm
9038
Hello.. CuCl is relatively unstable on the other hand CuI is stable.Though both being Copper(I).Why? One explanation i have is that Cu(I) is very soft and it...
arun l
devasby
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Nov 4, 2005
2:42 am
9039
Dear Mr John, Even I feel Sea plants, Sea animals, Sea deposits inside , Petrowells inside sea, enormous leaching /breathing of Sea animals also may...
tkseshadrinathan
tkseshadrina...
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Nov 4, 2005
6:56 am
9040
Dear members, I heard once that When we burn Polythene bags plolythene gases like Dioxins are emitted to make hole in Ozone layer. What reaction actually...
tkseshadrinathan
tkseshadrina...
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Nov 4, 2005
6:59 am
9041
Dear sir, Please send your Free magazines to following A/D T.K. SESHATHRINATHAN 101,PIELINEROAD, 11THCROSS,MALLESWARAM,BANGALORE 560 03 91-9880214558 THANK YOU...
tkseshadrinathan
tkseshadrina...
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Nov 4, 2005
7:06 am
9042
In a closed vessel, in the bottom of which there is some 95% ethyl alcohol, is introduced a drop of a sodium chloride saturated solution, and left at a short...
Salvatore
salvatore_pr...
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Nov 4, 2005
9:00 am
9043
thank you,John. JohnWW <JohnWW@...> wrote:(1) Atomic number 20 is calcium, in group IIa in the 4th period. (most abundant isotope 20-Ca-40, being...
chirag parmar
parmarstar
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Nov 4, 2005
12:01 pm
9044
2. Flame test is not shown by...a) MgCl2 b) NaCl C) CaCl2 D) KCL Flame test is not shown by Mg. Na,Ca& K shows golden yellow,brick red and lilac color...
arun l
devasby
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Nov 4, 2005
1:29 pm
9045
Dear TKS, I can add alittle to your question. Polyethylene consists of just carbon and hydrogen. Dioxin contains chlorine. Therefore, the chlorine in any...
Nathan Haese
nathanhaese
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Nov 4, 2005
4:32 pm
9046
... took the ... got the ... has been ... sulfate ... these have ... ocean has ... ago, ... Water is ... is no ... chemistry ... of ... i think the same answer...
hohohohohahaha
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Nov 4, 2005
4:59 pm
9047
... took the ... got the ... has been ... sulfate ... these have ... ocean has ... ago, ... Water is ... is no ... chemistry ... of ... i think the same answer...
hohohohohahaha
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Nov 4, 2005
4:59 pm
9048
Is it a test of chemistry? One could think too to radii effect: if we consider Cu+, Cl– and I– as ions, the steric constraints could be favorable to I–,...
breizh_cymru
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Nov 4, 2005
7:19 pm
9049
... //////////////////////////////////////////// Yes, indeed. Polyethylene is just a hydrocarbon, like methane and gasoline. Because of its molecular size...
rogersieloff
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Nov 4, 2005
7:41 pm
9050
We recently did an experiment in my physical chemistry class on heat of solution reactions. In it we measured the temperature change that occurs as varying...
Chad
chad_welch
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Nov 4, 2005
8:00 pm
9051
Chad, Here are a couple quick pointers, as time is limited. First, on the literature reference, go to the chem or engineering library or physics library, and...
Nathan Haese
nathanhaese
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Nov 4, 2005
8:29 pm
9052
Thanks Nathan for the direction. I'll be heading to the library tomorrow. Chad...
Chad
chad_welch
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Nov 5, 2005
12:38 am
9053
Here's my guess as to why CuI is less stable than CuCl: Eq. 1) I- plus H2O yields HIO plus H+ plus 2e- V= - 0.99 volts or same thing Eq. 2) I- plus...
brianejensen
brianedwardj...
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Nov 5, 2005
2:19 pm
9054
i think the answer is a follows... river water does contain dissolved salts on its way to the sea.and finally joins it.now here as everybody knows evaporation...
sricharan iyer
sricharansiyer
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Nov 5, 2005
2:38 pm
Messages 9025 - 9054 of 13930   Oldest  |  < Older  |  Newer >  |  Newest
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