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Messages 622 - 651 of 3940   Oldest  |  < Older  |  Newer >  |  Newest
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622
dichloromethane usually...
austinbooth
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Feb 1, 2002
8:11 am
623
Di Chloro Methane. Do you know how to activate copper turnings?...
bigmouthbillythebass
bigmouthbill...
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Feb 1, 2002
10:07 am
624
would u lke to pls tell me ehrlenmeyer flask use, i m not remembring so pls clear me it uses ok bye,<br>thanks....
shazia51
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Feb 1, 2002
1:56 pm
625
Hello Shaiza how are you?You know ehrlenmeyer flask is same conical flask.it s used for prepering some solutions or dissolving some solids or liquids in ...
organic_maffia
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Feb 1, 2002
2:50 pm
626
I assume that activation means removing the copper oxide (or sulfide?, etc.) coating. I am not sure, but heating might work. Other thoughts?<br><br>Dr. J...
octanediol
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Feb 1, 2002
5:56 pm
627
The ehrlenmeyer flask is useful for carrying out reactions, because liquids will not "creep up" the inside of the flask. It may be due to surface tension. In ...
octanediol
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Feb 1, 2002
6:04 pm
628
Okay I have an answer. It sounds right to me, but then again I am totally confused by my biochemistry class....<br><br>Anyway I got a pH of 1.53<br><br>How...
andrewnsara
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Feb 1, 2002
7:02 pm
629
thanks organic maffia and octanediol to tell me about that kind of flask ya i got all ur points. i have also solved ur numerical that pH is 1.52 .<br> total no...
shazia51
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Feb 1, 2002
9:56 pm
630
The equilibrium constant of a reaction you are interested in is 3.5 x 10^-5 (to the -5), what is delta G at 25 degrees C and 35 degrees C?<br><br>Also, what is...
andrewnsara
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Feb 1, 2002
10:18 pm
631
It may help you but i'm not sure.<br>To remove sulphur compounds, low masses, from the gasoline and other petroleum derivatives fist you wash the product with...
galopus
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Feb 2, 2002
12:45 am
632
Great. You have the correct answer. Would you like to try one involving the titration of acetic acid (a weak acid) with NaOH? It is more difficult. Let me...
octanediol
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Feb 2, 2002
1:01 am
633
I think that delta G = -RTlnK where R is the gas constant, T is the absolute temperature and lnK is the natural log of the equilibrium constant, K. I'll have...
octanediol
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Feb 2, 2002
1:11 am
634
Dr J<br><br>Thank you for your help. I do not know if I will need to do titration curves for the biochemistry course I am taking.<br><br>I have returned to ...
andrewnsara
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Feb 2, 2002
1:52 am
635
I'll be glad to help, Sara.<br><br>I know what it was like when I first started teaching at a small college in California. I had just finished a postdoc at Cal...
octanediol
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Feb 2, 2002
4:27 am
636
The concentration of H+ (H30+) is 10 to the -pH power.<br><br>The pH of blood plasma is 10 to the -7.2 power. This is an easy calculaton if you have an inverse...
octanediol
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Feb 2, 2002
4:39 am
637
I am one of the founders of the Chemical Exercises Club. For additional questions please visit that site.<br><br>Dr. J...
octanediol
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Feb 2, 2002
1:18 pm
638
ya dr.J i would like to solve these types of numericals. its nice place to excercise our self for calculations , i m too much intersted in these question, if u...
shazia51
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Feb 2, 2002
9:28 pm
639
I am one of the founders of the Chemical Exercises club. Please visit that site for more questions.<br><br>Dr. J...
octanediol
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Feb 2, 2002
9:59 pm
640
6 of one, half a dozen of t'other<br><br>pOH + pH = pKw (in water), so the method is essentially the same. Maybe it's better to do it the first way as you ...
StephanJBird
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Feb 4, 2002
11:07 am
641
Quick question... Trying to find definative answer if there is a test to distinguish Methanol from Ethanol. My advisor thinks she recalls the "G-men" from ...
bbrookuk
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Feb 5, 2002
11:58 pm
642
Wouldn't the iodoform reaction do this? Look it up in Vogel or something. If memory serves, it's used to detect things of the form MeCOR, or MeCH(OH)R where R...
StephanJBird
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Feb 6, 2002
11:44 am
643
I agree. I think the iodoform test would be positive for ethanol. I'll do some research.<br><br>Dr. J...
octanediol
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Feb 6, 2002
12:37 pm
644
Here's the catch... I did do it with a "modified Iodoform" however I'm limited to household chemicals so I used tincture of Iodine. It contains both KI and I2,...
bbrookuk
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Feb 6, 2002
2:13 pm
645
                          ...
jf_jutras
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Feb 13, 2002
4:31 am
646
Dear All,<br><br>I would like to inform you about World Scientific's new journal, the International Journal of Nanoscience (IJN), which covers one of the ...
wspc_physics
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Feb 15, 2002
7:33 am
647
HI MEMBERS,<br>WHAT KIND OF REACTION I CAN DO BY MICROWAVE AVEN.FOR EXAMPLE CAN I DO AN EXOTHERMIC REACTION BY MICROWAVE?...
hmasinin
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Feb 17, 2002
12:14 am
648
yes you can do an exothermic reaction and also you can do radioactive reactions and decomposing reactions by MW.But common organic compounds decompose by MW so...
organic_maffia
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Feb 17, 2002
1:43 pm
649
hi all now a days as u r discussing about microwaves, i have a question that is there any harm effect of microwave on food, as u all know we mostly use ...
shazia51
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Feb 17, 2002
9:00 pm
650
Being that all a micorwave does is excite molecules which generates heat. there isn't much it does. there is a shield on the microwave too. as far as i know...
shiara_blade
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Feb 17, 2002
9:27 pm
651
As far as I know microwave radiation increases the rotational and vibrational energy of a molecule. In cooking the water molecules in the food absorb this...
octanediol
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Feb 18, 2002
1:04 am
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