# CHMA10H3 Lecture Notes - Lecture 4: Thermodynamics, Internal Energy

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12 Sep 2018
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## Document Summary

Heat (q): the flow of thermal energy from one system to the surroundings due to the temperature difference between them: heat flow will stop when the temperatures of the system and the surroundings are both the same. Work (w): the force acting through a distance to displace something. Kinetic energy: energy associated with motion: measured in joules (j) U = q + w (it is the sum of heat and work) If delta u is positive: energy is flowing into the system. If delta u is negative: energy is flowing out of the system. If q is positive: the system is gaining thermal energy. If q is negative: the system is losing thermal energy. If w is positive: work is being done on the system. If w is negative: work is being done by the system: analyzing energy flow in 2 different reactions, 1: when the reactants have higher internal energy than the products.