Write a note on Spontaneity and free energy.
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Spontaneous Reactions:-
Reactions are favorable when they result in a decrease in the enthalpy and an increase in the entropy of the system. When both of these conditions are met, the reaction is said to be spontaneous at all temperatures. A spontaneous at all temperatures. A spontaneous reaction is a reaction that favors the formation of products at the conditions under which the reaction is occurring. A roaring bonfire is an example of a spontaneous reaction. Fire is certainly exothermic, which means a decrease in the energy of the system as energy is released to the surroundings as heat. The products of fire are composed mostly of gases such as carbon dioxide and water vapor, so the entropy of the system increases during most combustion reactions. This combination of a decrease in energy and increase in entropy means that combustion reactions occur spontaneously.
Energy:-
Many chemical reactions and physical processes release energy that can be used to do other things. When the fuel in a car is burnt, some of the released energy is used to power the vehicle. Free energy is the energy that is available to do work. Spontaneous reactions release free energy as they proceed. Recall that the determining factor for spontaneity of a reaction are the enthalpy and entropy changes that occur for the system. The free energy change of a reaction is a mathematical combination of the enthalpy change and the entropy change.