Which statement defines rate-determining step in a chemical reaction?

a the slowest step that determines the speed (rate) of the overall reaction
b the fastest step that determines the speed (rate) of the overall reaction
c an experiment that is performed to determine the rate law
d all the reactants in all the steps of a reaction mechanism

The equation below shows the reaction of zinc with hydrochloric acid (hcl). zn (s) + 2 hcl (aq) —> zncl2 (aq) + h2 (g) what will happen if the concentration of hcl is decreased? a. more zncl2 will be produced. b. the reaction rate will slow down. c. the hydrochloric acid will become more acidic. d. the reaction will produce water instead of hydrogen gas.