Which factors below affect the rate of a chemical reaction?

-Collision frequency
-Number of collisions having the least activation energy
-Intermolecular orientation
-Being Exothermic or Endothermic

Also, what formula would I use for this problem: "What is the hydroxide ion concentration of a hydrochloric acid solution with a hydronium (hydrogen) ion concentration of 0.000150M? Assume that pKw = 13.997 here." I just need help getting started on this one.

How could any reaction below the activation energy affect the rate?

I don't know. I think collision frequency does but I don't know about the others.