If gasoline is $2.50 per gallon for regular grade, how much will it cost a commuter to drive to and from work each day if the round trip distance is 45.5 miles and his car averages 11 km/L

Which change will decrease the number of effective collisions during a chemical reaction? a. adding a catalyst b. increasing the surface area c. decreasing the temperature d. increasing the reactant concentrations e. increasing the volume of the reactants