to be effective a collision requires...?

Question

a-enough energy only.
b-favorable orientation only.
c-enough energy and a favorable orientation.
d-a reation mechanism

2-how does the potential energy of the activated complex compare with the potential energies of the reactants and products?

3-if a collision between molecules is very gentle, the molecules are
a-more likely to be orientated favorabley.
b-less likely to be orientatted favorably.
c-likely to react.
d-likely to rebound without reacting.

4-a species that changes the rate of a reaction but is neither consumed nor changed is
a-a catalyst
b-an activated complex
c-an intermediate
d-an enzyme

Answer 1

1. Really requires c and d, but if you have to choose one, choose c.
2. Potential energy of the activated complex is higher than that of the product or reactant.
3. d
4. a

Answer 2

He's right!