Can you help me please.

Woah that’s a lot to read xd i’ll try though. i’ll get back t you if. i know the andwer

You can find the answer from the answers.com

For a collision to be successful you need 2 different objects 

In reversible reaction chemistry equilibrium is attained when the forward and reverse reactions are taking place at the same rate, thus, the concentrations of reactants and products remain the same. a reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back. in irreversible reactions on the other hand, the reactants react to form the products, which cannot revert back into reactants.