Chapter 19 Thermodynamics. What is Entropy? What is chemical spontaneity?. First Law. E nergy cannot be created nor destroyed , it only changes form Gets converted (high quality to low) or transferred from system to surroundings. How does this occur?. Spontaneously Nonspontaneously.
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What is Entropy?
What is chemical spontaneity?
Processes that are spontaneous in one direction are nonspontaneous in the reverse direction.
S = S finalS initial
The more disordered, or random, the system is, the larger the value of S.
In other words:
For reversible processes:
Suniv = Ssystem + Ssurroundings = 0
For irreversible processes:
Suniv = Ssystem + Ssurroundings > 0
These last truths mean that as a result of all spontaneous processes the entropy of the universe increases.
Statistical thermodynamics is a field that uses statistics and probability to link the microscopic and macroscopic world.
where k is the Boltzmann constant, 1.38 1023 J/K.