Calculate the overall temperature change for the cold pack (Tmax - Tmin). Show your work. 22.4 C – 2.9 C = 19.5 C was the difference of temperature change for the cold pack. 8.Calculate the overall temperature change for the hot pack (Tmax - Tmin). Show your work. 86.8 C – 29.1 C = 57.7 C was the difference of temperature change for the hot pack. 9.Which pack works by an exothermic process? Use experimental data to support your answer. The chemical reaction that releases heat is called an exothermic reaction, so the hand warmers work by an exothermic process because the temperature gradually became hotter.
10. Which pack works by an endothermic process? Use experimental data to support your answer. The cold pack or ice pack works by an endothermic process because energy is drawn in from the external environment, which causes its surroundings to lose heat, or cool down. 11. Write the balanced reaction for the dissociation of ammonium nitrate in water. NH4NO3—->NH4+ +NO3- NH4+ +NO3- +H2O —->NH4OH +HNO3 12. Which pack had the greatest change in enthalpy? How do you know? By measuring the temperature change in each cold pack and the hand warmer, I was able to figure out that the hand warmer pack had much greater enthalpy because the difference in temperature was much greater than the difference of temperature in the cold pack. 13. Describe what would happen to the maximum temperature if the experiment used double the amount of hand warmers. Justify your answer.