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Which mechanism causes endothermic reaction rate to initially increase with rising temperature?

A)Increased atomic isotope vibrational frequency
B)Exponentially rising effective kinetic energy
C)Lattice deformation decreasing bond distances
D)Catalyst surface area reduction surpassing diffusion

💡 Explanation

When temperature rises, effective kinetic energy increases exponentially based on the Boltzmann distribution, giving a larger fraction of molecules the activation energy needed to overcome the reaction barrier. Therefore reaction rate increases, rather than increased vibration, lattice strain change, or catalyst deactivation which require different specific physical conditions.

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