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.
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.