Hypersonic flight vehicles must endure strong aerodynamic heating due to the combined presence of several hydrodynamic phenomena, to include the formation of leading-edge shock waves, dissipation in compressible boundary layers, as well with shock/boundary layer interactions (Urzay, 2018; Candler, 2019; Urzay & Di Renzo, 2020). The elevated temperatures introduced by these phenomena give rise to several nonequilibrium thermochemical processes in the form of vibrational-electronic energy excitation, and chemical dissociation of diatomic species (Vincenti & Kruger, 1965; Park, 1990; Bertin & Cummings, 2006). As these thermochemicaleffects are strongly endothermic, accurate estimation of their rates proves crucial for prediction of aerodynamic heating. To assess the extent to which turbulent-mixing and chemical-kinetic processes couple in hypersonic boundary layers, affecting heating loads and near-wall chemical composition, we characterize turbulence-chemistry interaction in a Mach-7 hypersonic boundary layer undergoing significant chemical activity with direct numerical simulation. As the temperatures within the boundary layer exceed 5300 K, the molecular oxygen (O2) present near the wall is almost entirely dissociated, introducing significant concentrations of atomic oxygen and ultimately nitric oxide (NO). Turbulence-induced fluctuations in the thermodynamic-state variables effectively modulates the rate of chemical-kinetic processes, and as such, the Reynolds-averaged chemical-production rates differ substantially from their laminar-closure approximations. In order to further analyze this coupling of turbulent fluctuations with reactive processes, we present a novel computational approach for separating the impact of specific thermodynamic fluctuations on the finite-rate chemical-kinetic processes. Leveraging this decomposition, we demonstrate that while dissociation/recombination processes are indeed primarily impacted by turbulence-induced temperature fluctuations, species-concentrations fluctuations are shown to most significantly modify the rates of the Zel’dovich reactions, strongly affecting the production of atomic oxygen in the boundary layer.