The polish American physicist Roman Smoluchowski showed that the rate constant for a diffusion controller reaction between molecules A and B, Kd is given by where rAB is the distance (in cm) between the molecules and DA and DB are their diffusion coefficients. Calcu- late kD, given that DA-6.0 x 10-5 cm2 s-1, DB = 2.5 × 10-5 cm 2 s-1 at 20°C and rAB-1.0 × 10-8 cm

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In reversible reaction chemistry equilibrium is attained when the forward and reverse reactions are taking place at the same rate, thus, the concentrations of reactants and products remain the same. a reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back. in irreversible reactions on the other hand, the reactants react to form the products, which cannot revert back into reactants.

Theyre semiconductors.