1. Consider the following information about four substances: Electrical Conductivity as solid as Substance Melting Point (°C) | || ||| IV 776 -39 -190 1420 liquid Poor Good Poor Poor Good Poor Poor Poor The substance that is most likely an ionic compound is: A) I B) II 2. In the reaction between potassium and sulphur C) III D) IV Solubility in water High Low Low Low A) each potassium atom donates two electrons to a sulphur atom. B) each potassium atom donates one electron to a sulphur atom. C) each sulphur atom donates one electron to a potassium atom. D) the atoms share electrons, although this sharing is unequal.
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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