All energetically effective collisions do not result in a chemical change. Explain.

Answer

N/a

Explanation

Only effective collision lead to the formation of products. It means that collisions in which molecules collide with suffiecent kinetic energy (called threshold energy = activation energy + energy possessed by reacting species.)
And proper orientation lead to a chemical change because it faciliataes the breaking of old bonds between (reactant) molecules and formation of the new ones i.e., in porducts. e.,g formation of method fom bromometheane depends upon the orientation of the reactant molecules.

The proper orientation of reactan molecules leads to bond formation wheras improper orientation makes them simply black and no products are formed .
To account for effective collisons, another factor P (probability or steric factor) is introduced `K = PZ_(AB)e^(-E_(a)//RT)`