• Re: Open circuit voltage

    Updated: 2012-01-31 22:49:58
    very simple:connect electrodes to potentiostat, tell it to measure potential.Insert electrodes, do not turn on potential control of your cell and read out what the potential is between working and reference electrode.Alternately, you can also skip the potentiostat; insert the electrodes, shortcut the working with counter and put a volt meter between working and reference electrode.

  • estimate the difference in activation energies for the uncatalyzed vs enzyme?

    Updated: 2012-01-31 22:37:03
    Hello! I have this problem that I can't figure it out. I used K=A.e-eA/RT for both cases, took Ln, and substracted one from the other but I couldn't get the difference between both Ea. Any ideas? Thanks in advance! The enzyme urease catalyzes the reaction of urea,(NH2CONH2), with water to produce carbon dioxide and ammonia. n water, without the enzyme, the reaction proceeds with a first-order rate constant of 4.15x10^ -2 S^-1at 100 C . In the presence of the enzyme in water, the reaction proceeds with a rate constant of 3.4x10^-4 at 21C .b. Assuming the collision factor is the same for both situations, estimate the difference in activation energies for the uncatalyzed versus enzyme-catalyzed reaction

  • Re: potassium nitrate

    Updated: 2012-01-31 22:13:10
       talked to my chemistry teacher today about the things you guys brought up and I got some questions answered. First I asked about autodissociation and I now have a clear understanding about that. Then we talked about why there would be no hydroxide or ammonia ions in solution and I believe I now understand that. It is because as the solution is heated the water and ammonia will escape as a gas making the ammonia and hydroxide ions still in solution form more water and ammonia which will escape as a gas until there is really no more ammonia or hydroxide, And what little is left will just form ammonium hydroxide right?  

  • Re: H202

    Updated: 2012-01-31 21:17:13
    thanks very much, will start at 3% and try it outrich

  • Using nitric oxide at high pressure

    Updated: 2012-01-31 18:50:08
    We have a safety letter regarding nitric oxide reactions in this week’s issue of C&EN: Chemists at Merck & Co. were performing experiments using nitric oxide at high pressure (10–20 bar) when two instances of an explosion occurred during rapid depressurization of the NO headspace from a 500-mL closed reactor system. No injuries occurred, and damage [...]

  • CLT #21: Ay! You!

    Updated: 2012-01-31 13:00:50
    Welcome back to CLT! I found this cartoon doodled on the back of a quiz I gave last week in my organic chemistry class. The artist gave me permission to scan his contribution and post it here on the blog for everyone to enjoy. Made me chuckle. Click the image for larger. See other CLT [...]

  • Return to fundamentals

    Updated: 2012-01-26 19:29:51
    As we labor away on our extractive metallurgy project, I continue to marvel at how even complex extraction schemes reduce to the application of fundamental chemistry and basic unit operations. It is crucial to have a comprehensive understanding of the composition of your ore and the fate of the components as they are exposed to [...]

  • Chemistry in its element – carbon monoxide

    Updated: 2012-01-25 17:04:39
    In this week’s Chemistry in its element podcast, Duncan McMillan breathes life into carbon monoxide: a silent killer whose calling card is the ironically healthy hue of its victims. But, as Duncan explains, these days canary-based CO detectors are a thing of the past and we’re even learning that CO can be helpful [...]

  • Keep China busy- buy an iPhone.

    Updated: 2012-01-24 03:14:17
    Thanks to Bill in Michigan for the link on how the US lost out on manufacturing the iPhone. The article is well worth the read. A few of us have been beating this drum for a while. Economics is not a theory of physics. It is entirely about choices people make. But to some, economics has become [...]

  • This week on Chemistry World

    Updated: 2012-01-23 14:06:25
    22 January 2011: Have something to say about an article you’ve read on Chemistry World this week? Leave your comments below… Obama calls for renewed focus on manufacturing Although chemical trade groups support the President’s emphasis on manufacturing and energy, they caution against overregulation Illumina fends off Roche hostile bid Roche aims to expand personalised medicine diagnostics [...]

  • LinkedIn

    Updated: 2012-01-21 00:13:36
    Has anyone ever had a useful outcome from being on LinkedIn?

  • Organic Chemistry Extra Credit You Tube Parody Videos

    Updated: 2012-01-20 16:10:12
    Last spring, a few of my students made me an awesome parody video of Rebecca Black's Friday, "It's Lab Day." This semester, nearly half my class turned in lots of great parody videos.  Not all of them wanted to be shared publicly, but here are most of the videos my class made me!   Sunglasses [...]

  • Anti-SOPA Solidarity

    Updated: 2012-01-19 15:21:22
    In solidarity with yesterdays protest against internet censorship, my porch light remained dark last night. What is normally a shining beacon of hope in the neighborhood was last night a mute and dark void.  This pocket of frigid darkness sat in silent protest to those who would presume to stunt the billion webbed neurons of [...]

  • Vannoccio Biringuccio. Sixteenth Century Chronicler of Metallurgy.

    Updated: 2012-01-16 06:17:20
    By the early 16th century in Europe, metallurgy had become an established cottage industry in numerous locales. Artisans were sourcing copper, tin, zinc, antimony and iron ores for reduction, refinement and alloy production for cannon and bells among other products.  While there was no systematic science of chemistry in a form recognizable today, the necessity of constant proportions [...]

  • Load-in day

    Updated: 2012-01-15 16:41:44
    Being part-owner of a theatre company, I also get to be a roadie and stagehand for our play that opens in a week. Today is load-in day at the theatre. We have to move the set and props onto the stage and wings. Costumes have to go to the dressing rooms and make-up room supplies have to [...]

  • Cheap Laugh Tuesdays #18: Base Guitar

    Updated: 2012-01-10 13:09:50
    Welcome back to CLT! See more CLT humor via Mr. Brügge's Eighth Graders, although this particular one seems to be broken on that page Enjoy!

  • Devon Energy Sells Stakes to SINOPEC in Shale Gas Plays

    Updated: 2012-01-09 01:27:43
    Devon Energy has raised $900 million in cash from Sinopec Group for a stake in Devon shale gas plays. These gas projects include the Utica, Niobrara, and Tuscaloosa formations.  What is interesting is not so much that China has bought its way into the extraction of a resource that the USA has in some abundance. [...]

  • Chemistry of Ageing: New thematic series for Chemistry Central Journal

    Updated: 2012-01-04 14:55:55
    Categories All General Chemistry Marketing OA in the Developing World Conferences Presentations Open Access Editorial Board About We want to hear from you Mail us at editorial chemistrycentral.com Search Links Our blogs BioMed Central Blog Chemistry Central Blog Open Repository Blog Open Access Central BioMed Central Chemistry Central Other links F1000 Biology F1000 Medicine ChEBI Chem DB ChemRefer ChemSpider Chemists Without Borders Experimental Data Checker IUPAC Links for Chemists Process Analytical Technology PubChem WebElements eMolecules Archive January 2012 Mon Tue Wed Thu Fri Sat Sun 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Today Chemistry Central Blog Wednesday Jan 04, 2012 Chemistry of Ageing : New thematic series for Chemistry Central

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