The substances NaF and CaO are isoelectronic (have thesame number of valence electrons). (a) What are the chargeson each of the cations in each compound? (b) What are thecharges of each of the anions in each compound? (c) Withoutlooking up lattice energies, which compound is predicted tohave the larger lattice energy? (d) Using the lattice energiesin Table 8.1, predict the lattice energy of ScN.
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 substances NaF and CaO are isoelectronic (have the
same number of valence electrons). (a) What are the charges
on each of the cations in each compound? (b) What are the
charges of each of the anions in each compound? (c) Without
looking up lattice energies, which compound is predicted to
have the larger lattice energy? (d) Using the lattice energies
in Table 8.1, predict the lattice energy of ScN.
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