Is quantum theory the true foundation of chemistry?

[pivoxa15]

Chemistry deals with say 10^10 atoms or more (many types of molecules intermolecularly bounded together by dipole or disperson forces) so saying that quantum theory is the foundations of chemistry may be not be fully correct as quantum theory deals with countable number of atoms and only small molecules. Chemistry also grew out before the advent of quantum theory. Is it more correct to say that it is the 2nd law of thermodynamic which is at the foundations of chemistry? Chesmitry deals a lot with energy changes of molecules. i.e a molecule will change to a lower energy state. That use to puzzle me. How does a molecule 'know' there is a lower energy state in the first place? However I now realize it is really the 2nd law of thermodynamics and so the molecule dosen't 'know' but just does it 'naturally' according to this law.

 

[t!m]

quantum theory deals with countable number of atoms and only small molecules

Not true. At the present time, only relatively small molecules can be treated (almost) exactly with quantum theory, but this is only due to their computational intractability. Nonetheless, quantum mechanics is applicable to everything, it's just silly to use it to describe macroscopic objects, where Newtonian physics applies (and is much simpler). The interactions of atoms and molecules is still very much determined by quantum mechanics.

 

[ravenprp]

It is a complex question to determine the true foundation of chemistry, as different principles and theories have contributed to its development. While quantum theory has certainly played a significant role in understanding the behavior of atoms and molecules, it may not be the sole foundation of chemistry.

As mentioned in the content, chemistry deals with a large number of atoms and molecules, and the principles of quantum theory may not always apply at this scale. Furthermore, chemistry has been studied and practiced for centuries before the advent of quantum theory, indicating that other principles and theories have also contributed to its foundation.

The second law of thermodynamics, which states that the total entropy of a closed system will always increase over time, is certainly a fundamental principle in chemistry. It helps to explain the natural tendency of molecules to move towards a lower energy state, as mentioned in the content. However, it is important to note that this law is also based on the principles of quantum theory, as it is ultimately the behavior of individual particles that leads to changes in entropy.

In conclusion, while quantum theory has undoubtedly played a crucial role in shaping our understanding of chemistry, it may not be the only foundation of this field. The second law of thermodynamics, along with other principles and theories, also contribute to our understanding of chemical processes and reactions. It is the combination of these various principles that form the true foundation of chemistry.