CHMA10H3 Lecture Notes - Lecture 16: Boiling Point, Thermochemistry
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CHMA10H3 Full Course Notes
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Chma10h3 - introductory to chemistry i: structure and bonding lecture 16: energy. The system, surroundings, and the universe: the system represents the object or the collection of objects being studied, the surroundings represent everything outside of the system. Internal energy is the sum of the kinetic energy ad potential energy of the atoms, molecules and ions in the system. It is also known as the energy content of a system. It depends on the amount of a substance present. It depends on the amount of a substance and its conditions (i. e. , the temperature and pressure), regardless of how the conditions were achieved: the internal energy of the system cannot be measured. The change of internal energy, however, is of practical importance in thermochemistry. Enthalpy changes accompanying changes of state: energy needs to be exchanged between the system and the surroundings during change in state:
