Use this set of 4 demonstrations to introduce Big Idea 5 in your AP® Chemistry class or to review the concepts of thermodynamics after completing the unit. Students observe and interpret demos illustrating the concepts of heat sinks, extreme endothermic reactions, and exothermic reactions resulting in crystallization. Data analysis and Big Idea questions help prepare students for the AP® Chemistry Exam. Materials are sufficient to perform the set of 4 demonstrations twice.