Question

According to the collision theory, when can a chemical reaction occur?
When enough activation energy is added to correct the orientation of the particle collisions
When reactants collide with enough energy to intersect their valence shells and form new bonds
When reactants collide with enough mass to form new bonds and break apart the reactants
When the proper catalyst is added to break the chemical bonds in the reactants.

Answer 1

When reactants collide with enough energy to intersect their valence shells and form new bonds.