It is the study of the heat or energy involved in physical and chemical changes. Thermodynamics Thermochemistry Chemical Kinetics Chemical Equilibrium 2.) Which of the following refers to the first law of thermodynamics?  The entropy of all thermodynamic systems and of all states of a system approaches a minimum value at absolute zero temperature (0 Kelvin). Two different thermodynamic systems that are in thermal equilibrium with a third thermodynamic system are said to be in thermal equilibrium with each other. Total entropy (S), the measure of randomness of energy, of any isolated thermodynamic system increases over time.

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