Nope. Only electrons take part in the "chemical reaction". But if you collide two particles at the speed of light or close to it, then protons, neutrons and in fact other subatomic particles also take part in the reaction. PS: this is not a chemical reaction, it is called nuclear reaction. You need to accelerate particles at the ultimate speed because protons and neutrons are strongle held inside nucleus because of "strong force"
B)is physical change cause it can back from it's normal condition. c &d) chemical change cause it cannot back from it's normal conditions. I hope it will help
