Energy transfer can involve permanent change that cannot reverse {irreversible reaction}, because heat is made.
Energy transfer can have no friction or other opposing changes {reversible reaction}. In reversible reactions, external and internal temperatures and pressures are approximately the same. In reversible processes, system and surroundings are always in equilibrium. Reversible processes approximate slow energy transfer with small force and minimal resistance.
In reactions {spontaneous reaction}, activation energy can be less than difference in potential energy between transition state and products.
5-Chemistry-Inorganic-Chemical Reaction-Kinds
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Date Modified: 2022.0225