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
Precision Balance, 0.01g
Graduated Cylinder, 100mL
Magnetic Stir Plates/Stir Bars
Polystyrene Cups, 8oz
Lids for Polystyrene Cups
Thermometer or Temperature Probes