Lecture 14 - 15 Thermodynamics Annotations.pdf - Lecture#14 15 Classical Thermodynamics is the study of energy and its transformation The field of

Lecture 14 - 15 Thermodynamics Annotations.pdf - Lecture#14...

This preview shows page 1 - 2 out of 6 pages.

Lecture #14 - 15 Classical Thermodynamics is the study of energy and its transformation. The field of classical thermodynamics was developed independently of atomic theories – it was developed using the conversions of energy in steam engines. Thus far, we have discussed energies for atoms and electrons. For example, we analyzed the potential energies of the atoms based upon the Coulombic attraction between the protons and electrons. We analyzed the kinetic energy relationships with the electron being ejected in the photoelectric effect. The key idea throughout bonding and intermolecular forces is the notion that all processes are driven toward achieving a minimum energy state. Thermodynamics allows us to analyze the energy and its transformations at a deeper level. To understand how energies are being converted – we need to define the system and surroundings. Our system is generally our point of interest (i.e. chemical reactions, or a specific gas or metal, or a reaction vessel). We are analyzing how energy moves between the system and everything else (the surroundings). Generally, when doing thermodynamics, one must be clear in their definitions for the system and the surroundings. Open systems are open to everything – mass transfer and energy transfer can both occur. Isolated systems are closed to everything – neither mass transfer or energy transfer can occur. Closed systems allow for energy transfer but not mass transfer. For the first part of our discussion, we are focusing upon only energy transfer (no reactions); therefore, we are analyzing closed systems. Forms of Energy include kinetic and potential. Kinetic energy is associated with energy of motion (translation, rotation, vibration etc.). Potential energy is associated with energies of bonds—therefore, potential energies change when bonds are formed or broken. With thermodynamics, we are analyzing how the energies changes, therefore, we care about the change in internal energy ( D E), which is equal to the combined changes in potential and kinetic energies. If reactions or phase changes are not occurring, then the change in internal energy is simply equal to the change in kinetic energy.
Image of page 1

Subscribe to view the full document.

Image of page 2
  • Fall '08

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes