Chemical cold packs used for sports injuries are made with solid ammonium nitrate (NH4NO3) and a plastic bag of water. When the bag of water is broken the ammonium nitrate dissolves. NH4NO3(s) --> NH4+ (aq) + NO3- (aq) As the solution forms, the water and bag get colder. Which of the following is true for this process. ( Assume the reaction above is our system) Chose all that apply Select one or more: a. q for the water is negative. b. The solid ammonium nitrate has more enthalpy (H) than the ammonium and nitrate ions. c. Δ H for the reaction is positive d. The solid ammonium nitrate has less enthalpy (H) than the ammonium and nitrate ions. e. The process is endothermic. f. q for the water is positive. g. q for the reaction is positive. h. The process is exothermic. i. q for the reaction is negative.
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Chemical cold packs used for sports injuries are made with solid ammonium nitrate (NH4NO3) and a plastic bag of water. When the bag of water is broken the ammonium nitrate dissolves.
NH4NO3(s) --> NH4+ (aq) + NO3- (aq)
As the solution forms, the water and bag get colder.
Which of the following is true for this process. ( Assume the reaction above is our system)
Chose all that apply
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