What made alchemy unscientific in its practices?
a. it was not based on the atom being the basic unit of matter.
b. it could not turn metal into gold.
c. it was not accepted by scientists
d. it was not based on evidence and experiment.

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