Internal energy

[Valeria Viera 1B]

What is internal energy and how do we find it?

[Josephine Lu 4L]

Internal energy is a state property. It is found by adding q (heat) and w (work).

[AnnaYan_1l]

According to my notes:
Internal energy, U, is a state property. So, changes in U are a function of initial and final states (delta U = Ufinal - U initial). The energy of a closed system can be changed by heating/cooling or compression/expansion. Delta U = energy transferred by heating (+q) + energy transferred by compression (+w) = q + w

[josephperez_2C]

the internal energy of a system is the energy within the system, of the entire system, as well as the potential energy of the system as a whole due to external force fields

[Phil Timoteo 1K]

Internal energy is the energy within a system. It is calculated by adding q+w

[megan blatt 2B]

Internal energy is the energy within the system and is calculated by adding q and w together. It can't be calculated at a single point in time, but the change in internal energy can be calculated. At constant pressure, the change in internal energy is equal to the enthalpy minus pressure times change in volume, which can be derived by substituting the equations for q and w.