Students study the various energy changes that occur with the formations of solutions for laboratory salts. From this data they will create the best and safest hand warmer. Students will determine the heat of solutions for each solid and analyze the cost and safety information with provided safety data sheet. The activity contains enough materials for 15 groups of students as well as a Teacher’s Guide and Student Study Guide Copymasters. Meets Big Idea 5, Investigation 12, Primary Learning Objective 5.7. Kit Includes: 100g Calcium Chloride 100g Sodium Carbonate 100g Lithium Chloride 100g Sodium Acetate 100g Ammonium Nitrate 100g Sodium Chloride 200g Magnesium Sulfate Materials needed but not supplied: Water, Deionized or Distilled Balance, 0.01g Precision Graduated Cylinder, 100mL Magnetic Stir Plates/Stir Bars Polystyrene Cups, 8oz Lids for Polystyrene Cups Thermometer or Temperature Probes DOT Info: UN1942, Ammonium nitrate, 5.1, III, Ltd Qty