Find the density of an 8 gram rock if the water in a graduated cylinder rises from 25.0 mL to 29.0 mL when the rock is placed in to the graduated cylinder.

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.