Collision theory states ..1. the most probable single step reaction is a termolecular (trimolecular) reaction. 2. all reactions have at least two transition states. 3. a reaction can be stopped in the middle to collect transition states. 4. molecules must interact with sufficient energy and in the correct orientation in order to react.

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final