When a collision occurs between two reactant particles that between them have the required minimum kinetic energy or activation energy a product does not always form. what reasons ex?

Even when reactant particles collide with sufficient kinetic energy, a product may not form due to factors such as improper orientation during the collision, which prevents the necessary bonds from breaking and forming. Additionally, the presence of competing reactions or steric hindrance can inhibit product formation. Finally, some reactions may require specific conditions, such as temperature or pressure, that are not met despite the collision occurring.