Part two of the first year in the Portland Project, a three-year high school integrated science curriculum, is contained in this student guide. This volume, one of four parts in the year course, involves activities relating to what is considered the most powerful unifying concept in science: energy. The macroscopic aspects of heat as embodied in calorimetry are related to the microscopic in terms of random molecular motion. This helps to develop the concept of the atomic nature of matter, which is essential to much of the unit. Various energy conversions form the vehicle for extending and generalizing the energy concept. Nuclear energy is explored, and, finally, the thermodynamic limitations and implications of energy conversion are considered. About half of the right-hand side of most pages in the volume is blank for the purpose of recording observations and other notes. (For additional information about the Project, see SE 013 702, SE 013 704, SE 013 705, and SE 013 706.) (Author/PR)