Does an individual atom of helium have a melting point and why or why not? O No, an individual atom cannot be considered a solid or a liquid so there is no temperature at which it can change from one to the other. O Yes, the melting point of an individual atom can be measured using advanced techniques such as atomic force microscopy. O No, an individual atom is too small to see so we cannot measure the temperature at which it changes from a solid to a liquid. O Yes, the melting point of helium is the same whether there is one atom or one mole of atoms.
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.
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