Thermodynamics: Thermodynamic Favorability 🧨 - AP Chemistry Learning & Test Prep

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spk_0 Free energy and the thermodynamic favorability of a reaction is determined by enthalpy,

spk_0 entropy, and, sometimes, temperature. Gibbs free energy change is described by the equation

spk_0 delta g equals delta h minus t times delta s. This gives four possible cases for the enthalpy

spk_0 and entropy. If both delta h and delta s are positive, then the process is an endothermic

spk_0 process that involves an increase in system entropy. In this case, delta g will be negative

spk_0 if the magnitude of the t delta s term is greater than delta h. If the t delta s term is

spk_0 less than delta h, the free energy change will be positive. Such a process is thermodynamically

spk_0 favorable at high temperatures and not thermodynamically favorable at low temperatures. If both delta

spk_0 h and delta s are negative, the process is an exothermic process that involves a decrease

spk_0 in system entropy.In this case, delta g will be negative if the magnitude of the t delta

spk_0 s term is less than delta h. If the t delta s term's magnitude is greater than delta

spk_0 h, the free energy change will be positive. Such a process is thermodynamically favorable

spk_0 at low temperatures and not thermodynamically favorable at high temperatures. If delta

spk_0 h is positive and delta s is negative, the process is an endothermic process that involves

spk_0 a decrease in system entropy. In this case, delta g will be positive regardless of the temperature.

spk_0 Such a process is not thermodynamically favorable at all temperatures. If delta h is negative

spk_0 and delta s is positive. This condition describes an exothermic process that involves an increase

spk_0 in system entropy. In this case, delta g will be negative regardless of the temperature.

spk_0 Such a process is thermodynamically favorable at all temperatures.

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