✏️ SIMULADO UNICAMP 2027 | Atletas que sofrem problemas musculares durante competições podem

Athletes who suffer muscle problems during competitions can use instant hot or cold packs as first aid devices. Commented correction of a CHEMISTRY question from the official 2027 entrance exam simulation of the State University of Campinas (UNICAMP). The organization that prepares the UNICAMP entrance exam is COMVEST. UNICAMP is a public, free, and high-quality institution. This is a detailed solution that follows the official answer key. 👇🏽⬇️👇🏽Videos and Playlists that may help:👇🏽⬇️👇🏽 1)📝 UNICAMP 2027 SIMULATED EXAM – CHEMISTRY – DETAILED SOLUTION    • 📝 SIMULADO UNICAMP 2027 – QUÍMICA – RESOLU...   2) ► Playlist of UNICAMP questions (ordered by subject):    • ✏️ UNICAMP Questões ordenadas por Assunto ...   3)🏆 UNICAMP (2028 to 2023) 📝Questions ordered Application    • 🏆 UNICAMP (2028 até 2023) 📝Questões ordena...   4) ► Lesson on the topic: [not available] 5) ► +Questions on the topic of the question:    • ► Termoquímica [Físico-Química pt.5]   📂 FREE OPEN FOLDER WITH MATERIALS: Exercise Lists, Summary Maps, Study Guides in CHEMISTRY and much more. https://drive.google.com/drive/folder... ⭐SUPPORT - Become a member of this channel and get benefits:    / @quimicapravaler   Question statement: (UNICAMP SIMULATED EXAM 2027) Athletes who suffer muscle problems during competitions can use instant hot or cold packs as first aid devices. These are typically plastic bags containing water in one section and a dry chemical substance in another. When the bag is struck, the section containing water ruptures and the temperature increases or decreases, depending on the enthalpy change of the solution. This process consists of two stages: the first provides the lattice enthalpy, which is the energy absorbed to break the bonds of the ions; The second corresponds to the hydration enthalpy, in which energy is released. The enthalpy change of the solution (ΔHsol) will be determined by the sum of these two enthalpies. Consider two salts that can be used in thermal bags and their respective enthalpies of solution: CaCl2(s) + H2O(l)  Ca2+(aq) + 2Cl-(aq); H = –82.8 kJ.mol-1 NH4NO3(s) + H2O(l)  NH4+(aq) + NO3-(aq); H = +26.2 kJ.mol-1 Taking into account the information in the text above, it is correct to state that a thermal bag used for a hot compress a) should contain calcium chloride; in this case, the lattice enthalpy is less than the hydration enthalpy and the overall process is endothermic. b) Hot should contain ammonium nitrate; in this case, the lattice enthalpy is greater than the hydration enthalpy and the overall process is exothermic. c) Cold should contain ammonium nitrate; in this case, the lattice enthalpy is greater than the hydration enthalpy and the overall process is endothermic. d) Cold should contain calcium chloride; in this case, the lattice enthalpy is less than the hydration enthalpy and the overall process is exothermic. --------------------------------- Don't waste time ⌚ subscribe to the channel so you don't miss any content! ❤ ►    / @quimicapravaler   Any questions about the lesson topic? Leave a comment! --------------------------------- #chemistryforreal #unicamp #enem #medicine