Problem: A chemist burns steel wool in air and observes that it burns slowly. She burns steel wool in pure oxygen and observes that it burst into flames, burning more rapidly. Which factor is affecting this reaction rate?A. The physical state of the reactants.B. The reaction temperature.C. The reactant concentrations.D. The presence of a catalyst.

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A chemist burns steel wool in air and observes that it burns slowly. She burns steel wool in pure oxygen and observes that it burst into flames, burning more rapidly. Which factor is affecting this reaction rate?

A. The physical state of the reactants.

B. The reaction temperature.

C. The reactant concentrations.

D. The presence of a catalyst.