A sample of phosphorus-32 shows an initial activity of 105 disintegrations per minute. 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. An aqueous solution is prepared by dissolving 2.05 g of hemoglobin in 100.0 mL of solution. 1- F97 Version 3 1. 11 Return to question. 12 Return to question.