1 / 3

CHEM 433 - 10/13/11

CHEM 433 - 10/13/11. III. 2 nd Law of THERMO • Intro & Overview ( 3.1 - 3.2 ) - 2nd Law Statements - Using it:  S SYS vs.  S SURR (this is the hard way…) READ: CHAPTER 3 HW #5 Due Monday Web is up-to-date, including review sheet (will post HW#4 key late tomorrow or M).

valentine-lawrence
Télécharger la présentation

CHEM 433 - 10/13/11

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CHEM 433 - 10/13/11 III. 2nd Law of THERMO • Intro & Overview (3.1 - 3.2) - 2nd Law Statements - Using it: SSYS vs. SSURR (this is the hard way…) READ: CHAPTER 3 HW #5 Due Monday Web is up-to-date, including review sheet (will post HW#4 key late tomorrow or M)

  2. 1ST LAW: What can happen? (permissible changes)• ΔU = q + w or dU = dq + dw• The work needed to change an adiabatic system is the same, regardless of how the work is performed (wad = ΔU).• Energy is conserved. It is neither created nor destroyed.• “You can’t get something for nothing!”

  3. 2ND LAW: What does happen? (spontaneous changes)• No process is possible in which the sole result is absorption of heat from a reservoir and its complete conversion to work. (Kelvin, Planck)• Heat can not be conveyed from a lower temperature reservoir to a higher temperature reservoir, without the performance of work. (Clausius)• The ENTROPY of an isolated system increases in the course of spontaneous change (Stot > 0).• You can convert all your work into heat – but you can’t convert all your heat into work.—> “You can’t even break even!”

More Related