Which of the following is a diatomic molecule?

ca2-

n2

kcl

mgcl2

The respiratory system removes oxygen and water from the body. select the best answer from the choices provided t f

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

Me pl give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.