Spontaneous processes occur on their own and lead to lower energy in the system and increased stability.
Most exothermic reactions occur spontaneously at room temperature. The enthalpy decreases and excess energy is released to the surroundings. This increases stability.
Some endothermic reactions occur spontaneously at room temperature. The enthalpy of the chemical system increases, energy is taken in from the surroundings.
A process is spontaneous if a chemical system beomes more stable and its overall energy decreases. The overall energy decrease is due to enthalpy and entropy. The contribution of entropy depends on the temperature. Energy derived from entropy is T x delta S (where T is measured in Kelvin)
As T increases, the energy derived from entropy becomes more significant
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