From owner-chemistry@ccl.net Sun Jul 21 14:07:01 2013 From: "bonoit bonoit bonoit_10++yahoo.fr" To: CCL Subject: CCL: Oxygen atom Message-Id: <-48980-130721140552-19612-KyeuHhv9G77810GIAqapvw(!)server.ccl.net> X-Original-From: "bonoit bonoit" Date: Sun, 21 Jul 2013 14:05:50 -0400 Sent to CCL by: "bonoit bonoit" [bonoit_10[a]yahoo.fr] Dear CCLers, I would like to enquire about the oxygen atom. What is the difference between the O(3P) and O(1D)? Regards Bonoit From owner-chemistry@ccl.net Sun Jul 21 14:41:00 2013 From: "bonoit bonoit bonoit_10+*+yahoo.fr" To: CCL Subject: CCL: Pressure Message-Id: <-48981-130721141055-21367-9T+6zVdGjObpWNsfrNtXYg__server.ccl.net> X-Original-From: "bonoit bonoit" Date: Sun, 21 Jul 2013 14:10:54 -0400 Sent to CCL by: "bonoit bonoit" [bonoit_10[-]yahoo.fr] Dear CCLers, I would like to enquire about the meaning of high-pressure limit and low-pressure limit and what are their influence on the rate of a given reaction. I mean why some products form in the high-pressure limit and other low-pressure limit? What is the relation of these two pressure limits with temperature? Regards Bonoit From owner-chemistry@ccl.net Sun Jul 21 22:06:00 2013 From: "Van Dam, Hubertus J HubertusJJ.vanDam~!~pnnl.gov" To: CCL Subject: CCL: Pressure Message-Id: <-48982-130721220339-14602-ThLuX4RGXIvpqH2lWax1/w{}server.ccl.net> X-Original-From: "Van Dam, Hubertus J" Content-Language: en-US Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="iso-8859-1" Date: Sun, 21 Jul 2013 19:03:32 -0700 MIME-Version: 1.0 Sent to CCL by: "Van Dam, Hubertus J" [HubertusJJ.vanDam(-)pnnl.gov] Hi Bonoit, I assume you are talking about gas-phase reactions. In gas-phase reactions the pressure at which a reaction is performed shifts the equilibrium composition. If the pressure is increased the equilibrium shifts towards the side with fewer molecules and for pressure lowering the opposite happens. Differences in temperature have similar effects, with higher temperatures shifting the equilibrium to the endothermic side and vice versa. This is a straightforward application of Chatelier's principle (in the Netherlands it is referred to as the van 't Hoff principle but I haven't been able to find an obvious reference to his contribution). Best wishes, Huub van Dam Pacific Northwest National Laboratory Tel:  509-372-6441 -----Original Message----- > From: owner-chemistry+hubertus.vandam==pnnl.gov*|*ccl.net [mailto:owner-chemistry+hubertus.vandam==pnnl.gov*|*ccl.net] On Behalf Of bonoit bonoit bonoit_10+*+yahoo.fr Sent: Sunday, July 21, 2013 11:11 AM To: Van Dam, Hubertus J Subject: CCL: Pressure Sent to CCL by: "bonoit bonoit" [bonoit_10[-]yahoo.fr] Dear CCLers, I would like to enquire about the meaning of high-pressure limit and low-pressure limit and what are their influence on the rate of a given reaction. I mean why some products form in the high-pressure limit and other low-pressure limit? What is the relation of these two pressure limits with temperature? Regards Bonoithttp://www.ccl.net/cgi-bin/ccl/send_ccl_messagehttp://www.ccl.net/chemistry/sub_unsub.shtmlhttp://www.ccl.net/spammers.txt