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← ScienceWhich consequence arises when adding excess reactant in equilibrium?
A)Increased product formation concentration and rate✓
B)Decreased activation energy over time
C)Reduced temperature due to endothermicity
D)Unaffected reaction; system already balanced
💡 Explanation
Adding reactants shifts equilibrium via Le Chatelier's principle, therefore increasing both product formation concentration and the overall reaction rate, because the additional reactant provides the activation energy requirements, rather than decreases or no effect.
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