Using bromobenzene and ethylene oxide as your only sources of carbon, show how you could prepare trans-2,3-diphenyloxirane (a racemic mixture of enantiomers). One possible synthetic route involves an epoxide intermediate:

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.