Addresses AP® Chemistry Big Idea 5 and Learning Objective 5.7. Determine specific heat capacity of a calorimeter and molar enthalpy of solution of 2 chloride salts. Teach lab with guided or inquiry activity. Guided activity: students determine specific heat capacity of a calorimeter; use calorimeter to determine molar enthalpy of solution of calcium chloride/ammonium chloride. Inquiry activity: students design hot pack or cold pack using chloride salts. Uses NO nitrate salts. For 30 students.