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← ScienceWhich outcome shifts towards reactants when an endothermic reaction reaches equilibrium and temperature decreases?
A)Equilibrium constant's numerical value decreases✓
B)Reaction rate increases beyond original
C)Activation energy threshold diminishes notably
D)Catalyst effectiveness approaches infinity.
💡 Explanation
When temperature decreases in an endothermic reaction at equilibrium, the reverse (heat-releasing) reaction is favored due to Le Chatelier's principle, lowering the equilibrium constant because the system shifts towards more reactants. Therefore, the numerical value of the equilibrium constant decreases, rather than increased rate, lowered activation energy, or heightened catalyst which require alternate energy inputs.
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