(b) Write chemical equations for the following processes: (i) Chemical reaction for ΔH°f for mercury(I) phosphate (ii) Thermal dissociation of gaseous bromine (iii) Sublimation of carbon dioxide
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.
(b) Write chemical equations for the following processes:
(i)
(ii) Thermal dissociation of gaseous bromine
(iii) Sublimation of carbon dioxide
(iv) Reduction of VO2+to produce VO2+
(v) Neutralization of sulfuric acid by barium hydroxide
(vi) Thermal decomposition of 1 mol of sodium bicarbonate to produce sodium carbonate, carbon dioxide and water
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In a chemical reaction; the substance which involves in conversion is said to be reactant whereas the newly formed substance is called as product. Both reactant and products must be separated by arrow.
The physical states of reactant and product molecules must be mentioned in parenthesis as subscript like (aq) indicates the aqueous state of ions and (g) represents the gaseous state of molecule.
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