NaCl and KF have the same crystal structure. The only differencebetween the two is the distance that separates cationsand anions. (a) The lattice energies of NaCl and KF are givenin Table 8.1. Based on the lattice energies, would you expectthe Na¬Cl or the K¬F distance to be longer? (b) Use theionic radii given in Figure 7.8 to estimate the Na¬Cl andK¬F distances.
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.
NaCl and KF have the same crystal structure. The only difference
between the two is the distance that separates cations
and anions. (a) The lattice energies of NaCl and KF are given
in Table 8.1. Based on the lattice energies, would you expect
the Na¬Cl or the K¬F distance to be longer? (b) Use the
ionic radii given in Figure 7.8 to estimate the Na¬Cl and
K¬F distances.
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