Chemical Thermodynamics 4.1 - Spontaneous Processes

Short physical chemistry lecture on spontaneous processes in isolated systems.

Spontaneous processes are irreversible processes which occur without energy input into a system. Spontaneous processes in isolated systems are those which increase the disorder.

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Microphone: Blue Yeti USB Microphone

Drawing Tablet: Wacom Intuos Pen and Touch Small

Drawing Program: Autodesk Sketchbook Express

Screen Capture: Corel Visual Studio Pro X8

[andregraham]

why is there no work done nor heat exchanged for the mixing of the gases?

[Irrazzo]

Thank you as always for the great course!
Correction suggestion for this section:
Since the 2000's, most introductory texts seem to have replaced the notion "entropy measures disorder" with the notion "entropy measures energy dispersal". Apparently, the former seems to be deemed misleading, while the latter seems to be judged to tell students what's actually going on  microscopically. Just google "entropy is not disorder", read the article "A Modern View of Entropy" by Frank Lambert available online, or the Wikipedia article "Introduction to Entropy" for justification and illustrating examples.

[nkyu]

Can reversible process be spontaneous process? A and G come from ds>=0 which means reversible and irreversible process.