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.
How is free energy used to understand biogeochemical cycling of chemicals in soils?
2. If phosphorus availability to a plant is measured using an extraction of the soil, does the measured value represent bioaccessibility or bioavailability?
3. Which of the following are not considered a soil a soil chemical: Pb2+, Fe3+, plant root, ferrihydrite, soil organic matter, soil microbe, NaHCO3 (s), AlOH2+, CO2 (g)?
4. Silicon has an electronegativity of 1.9 and Al3+ has an electronegativity of 1.6, which will have a more covalent bond with oxygen (electronegativity=3.44)? How might this affect dissolution of a mineral containing these elements?
5. What is the relationship between hydration energy, hydrated radius, and water exchange rate? What is a principle force that explains water-ion interactions?
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