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Kinetics is used to understand the rate of a reaction, while thermodynamics predicts whether the reaction will occur or not occur, and how favorable the reaction is. Thermodynamics, however, gives no indication of the speed of a reaction.
A chemical reaction has kinetic and thermodynamic aspects. The kinetics rate constant is associated with the activation energy required for the reaction to proceed (reactivity of the reactants). The thermodynamic quantity is the energy difference that results from free energy given off during a chemical reaction (stability of the products relative to the reactants).
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