Put the following in order, from the one with the greatest impact on reaction rate to the one with the least impact on reaction rate: temperature, amounts of reactant, and presence of catalyst.

Answer 1

Factors affecting rxn rates are:
C.A.N.T.C

C => Concentration Effects
A => Area (Surface Area)
N => Nature (Structural Chem of Reagents
T => Temperature
C => Catalysts

The relative effect of one factor over the other varies with the desired outcome of the process being studied. Under one set of circumstances the order of impact will be different than it would be under different set of circumstances. The important issue is to understand these rate factors set the foundation for generation of Rate Laws that define the rates of reactions empirically, numerically and experimentally. I like the order listed above. It's easy to remember ... C.A.N.T.C => (Conc/Area/Nature/Temp/Catalysts)