The vapor pressure of pure water at 25 o C is 23.77 mm Hg. An aqueous solution is prepared by dissolving 2.05 g of hemoglobin in 100.0 mL of solution. After 7.0 d the radioactivity is found to be 75 disintegrations per minute. Catalysts affect the reaction rate, but do not appear in the rate law since their concentration does not change. Catalysts are formed in one step of a reaction mechanism and consumed in another.
Catalysts lower the activation energy for the reaction.
Catalysts usually change the mechanism for a reaction. Catalysts may be insoluble in the reaction solvent. Reduction is always accompanied by oxidation. 1- F97 Version 1 1. 13 Return to question.