The dissolution of ammonium nitrate in water is given by the following equation: NH4NO3(s) + heat → NH4+(aq) + NO3-(aq) Which statement best describes what an energy graph of this reaction would look like? The reactants would appear at a lower energy state than the products. The reactants and products would appear at a low energy state. The reactants would appear at a higher energy state than the products. The reactants and products would appear at a high energy state.
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.
The dissolution of ammonium nitrate in water is given by the following equation:
NH4NO3(s) + heat → NH4+(aq) + NO3-(aq)
Which statement best describes what an energy graph of this reaction would look like?
- The reactants would appear at a lower energy state than the products.
- The reactants and products would appear at a low energy state.
- The reactants would appear at a higher energy state than the products.
- The reactants and products would appear at a high energy state.
Base on heat energy, the chemical reactions are categorized as exothermic and endothermic reactions.
Exothermic reactions: The reactions in which high energy reactants are converted into low energy or more stable products by releasing heat energy, are called as exothermic reactions.
general reaction: Reactants -------> products + heat
Endothermic reactions: The reactions in which low energy or stable reactants are converted into high energy or less stable products by absorbing the heat energy.
general reaction : Reactants + heat ------> products.
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