## Chemistry and Chemical Reactivity (9th Edition)

a) The rate equation is second order in NO $r\propto [NO]^2$ and first-order in Br2: $r\propto [Br_2]$ $r=k[NO]^2 [Br_2]$ b) Since the concentration of Br2 is tripled, so does the reaction rate by the rate equation. c) Since the concentration of NO is halved, the reaction rate is divided by a factor of 4, by the rate equation.