In this chapter, students are mainly taught the factors affecting the rate of reaction and the energy changes during a reaction. Mastery of this chapter allows students to understand the importance of controlling variables in making comparisons. This course is designed for students to have a confident approach when dealing with questions from this chapter as well as for students to flawlessly ace such questions. More importantly, it will review concepts taught in Chapter 11, 12, and 13 as cross references to further examine the command of students’ abilities in Chemistry. As such, this is the application of chemical concepts across many major themes and should be taken with care to pursue Chemistry to a higher level.