The Science of Chemistry 141 Chemistry 2010-09-02T20:27:57 Science Guy barry.david.adams@gmail.com Chemical Forums 2010-09-02T20:29:38

it would be necessary to know if the gas is "dry" or "wet", if it's dry then it can be handled with carbon steel or stainless steel if it's wet you need an higher alloy nickel alloys, have a look at this paper from NIDI on material selection for chlorine services:http://www.stainless-steel-world.net/pdf/10020.pdfhope this helpVitt

f7e19671940e76adb0f016544ca56b85 Chemical Forums 2010-09-02T20:24:35

Can I post Biochem questions on here? If not, can someone give me a helpful website please?thanks, Mandy

a436c4cf979f29fe1454ada19ca475c8 Chemical Forums 2010-09-02T20:23:53

are the two materials in direct contact? if they are not then is not possible to have Galvanic Corrosion. in they are then based on the galvanic series of metals  aluminum should be the metal that corrodes, even if in distilled water with low conducibility galvanic corrosion will be limited and also if it's a closed loop then the oxygen should be depleted and corrosion should stop.Vitt

dcd60b836040f185b267ed8f0903699a Chemical Forums 2010-09-02T19:51:53

First of all energy changes happen at a molecular level (they are caused by the breaking of some bonds and the forming of others: reaction enthalpies can be roughly evaluated calculating the changes in bond energy) so the energy is taken from (or given to) the solution itself. Obviously the reaction can be exothermic enough to cause the heating of the surroundings too (try to mix NaOH and vinegar in a bowl and you'll feel the heat released) but this is simply caused by the conduction of a part of the energy released through the container.

8cd427fc85b4b8a3207b8a602b710ee0 Chemical Forums 2010-09-02T19:32:05

Phase changes happen when the vapor pressure (in this case that of the liquid pentane) is equal to the external pressure. You know that pentane is liquid at 293 K and atmospheric pressure... (pvap<patm) how does vapor pressure change when temperature increases?

5c6120154c953e790ce989e96b909aae ACS Matters Weekly Newsletter 2010-08-31T20:45:00

The program of C&EN Webinars on cutting-edge research topics continues to broaden; you can register now for any of these upcoming sessions: Core Technologies for Chiral & Specialty Intermediates for Pharma (Thursday, September 9, 10:00 a.m. EDT); Hopscotch and Jump Rope - get lead hops, scaffold hops, and step-jumps in potency, with unique computational strategies for molecular design (Thursday, September 16, 11:00 a.m. EDT); or Stabilized Lithium Metal Powder (SLMP): A New Approach for Energy Storage and Other Applications (Thursday, September 23, 9:00 a.m. EDT).

860feaa69bff92fe5b0f2eaa76729afe ACS Matters Weekly Newsletter 2010-08-31T20:45:00

Log In ACS Journals C EN CAS ACS Network Store Governance About Us Contact Publications Meetings Careers Membership Networks Education Policy Funding Awards Press Room American Chemical Society Careers Job Search Starting a Job Club Job Clubs Provide Support for Your Job Search Job Clubs Provide Support for Your Job Search If You Can’t Find One That’s Right for You , Start Your Own Misery Loves Company An informative article on Job Clubs by an ACS . expert Other Job Club : Resources Job Club Webinar Series Job Search Strategies Webinar wmv file 53 MB Preparing Your Resume Webinar wmv file 59 MB Effective Interviewing Webinar wmv file 52 MB ACS Career Series Videos Planning My Job Search wmv file 67 MB The Group Discussion Guide Facilitators Discussion Guide Resumes wmv file 58 MB The Group

89580abf8b1ef3b8eebd3fa25b32df19 SimpleChemConcepts Tips 2010-08-31T05:30:34

For all students learning O Levels Chemistry (and other equivalents), it is important that you understand the difference between the 3 types of formulae commonly used – namely Molecular Formula, Empirical Formula and Structural Formula. Previously, we have discussed on this topic before. You can find them HERE. Let’s define them now, for better understanding and application: Molecular [...]

a325b673a01c1592abea0e8b7e509395 SimpleChemConcepts Tips 2010-08-24T02:47:56

Air or some like to call it Atmosphere is considered a ‘minor’ chapter in GCE O Levels Chemistry examination, so much so that many teachers do not emphasise on their existence, not to mention importance. As described by my Sec 4 Chemistry students, many of their Chemistry School teachers: Ask the students to read textbook on their [...]

ec2f9f359529a1ae9c6bad1ecc8e531f SimpleChemConcepts Tips 2010-08-22T03:30:33

The following Mole Calculation question is not difficult but many O Levels Chemistry students tends to make mistake in exams, where time is not a luxury. When the same question was posed to my regular classes of Sec 3 and 4 O Levels and IP students, i realised that many fall into the trap also. Let’s [...]

049a25bab231915c53ede7d7925e0b29 SimpleChemConcepts Tips 2010-08-14T01:29:34

In the previous post, we have discussed on a MCQ question on Electrolysis that requires students to: 1. Write out discharge half equations 2. Do Molar Ratio Comparisons Question: Which of the following requires the least  number of eletrons for discharge? A. 2 mol of Al3+ (aluminium) ions B. 5 mole of OH- (hydroxides) ions C. 3 mol of O2- (oxides) ions D. [...]

7975a2918aff4ca82f96ae33ea30df48 SimpleChemConcepts Tips 2010-08-12T06:28:27

In the previous post, we have discussed on 1 MCQ question on Electrolysis that requires basic Mole Calculations strategy to solve. Do note that Electrolysis topic is only applicable to students taking: GCE ”O” Level Pure Chemistry (Code: 5072) Integrated Programme (IP) – it will be classified under Electrochemistry chapter IB programme IGCSE and other equivalents It is NOT applicable to [...]

137fba04424e89fbacfdae891f09272c Chemistry Blog 2010-08-02T06:03:48

Mitch’s post showing the video of “the mark of the chemist” reminds me of one of the most visible remembrances I have of graduate school: the scar on one of my middle fingers (see left.) On a lovely Saturday in the lab (my music playing, no one else around), I dropped a Dewar flask from [...]

af0080d8cac01a3dee5694d041517989 Chemistry Blog 2010-07-26T23:23:02

From: SMBC – Fear Itself ~Mitch

3605ca05f121f22444401f5de0aa9a18 Chemistry Blog 2010-07-21T06:34:32

The Gulf oil tragedy has already shown the ignorance of some reporters about chemistry. However, a Mobile TV station and their chemist has taken it to new heights when they blamed the oil spill for (likely) bad glassware. WKRG is a local TV news station in Mobile, Alabama; they sent intrepid reporter Jessica Taloney to [...]

5797b9cb01c000d249729d84cb671405 Chemistry Blog 2010-07-13T15:51:43

While cleaning out my newly assigned “war room” (the setting where I’ll strategize on how best to torture students this fall), I came across some fairly interesting documents that were buried in far corners of crowded file cabinets.  They’re nothing personal or discriminating (sorry TMZ), but I saw them as material I could use in [...]

96583a4c520896395a62564c6b99fde5 Chemistry Blog 2010-07-09T16:57:23

I once saw an undergraduate setting up a reflux in my lab, and I could tell immediately it wasn’t going to work. The undergraduate didn’t take enough precautions to ensure that the liquid wouldn’t leak out from the joint connecting the round bottom flask and the condenser. I debated whether I should say anything, but [...]

6a2ff627b3f267c5b87c502b46803401 Chemistry Blog 2010-07-05T16:45:30

Over dinner the other night, my uncle and I started comparing and contrasting our academic experiences.  He’s a fascinating person who earned a bachelor’s degree in computer science in the late 1970’s. After discussing the finer points of Moore’s Law, and how he agonized over purchasing a 20 MB hard drive in the 1980’s for [...]

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