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 diameter of a rubidium atom is 4.95 A° . We will consider
two different ways of placing the atoms on a surface. In arrangement
A, all the atoms are lined up with one another
to form a square grid. Arrangement B is called a close-packed
arrangement because the atoms sit in the “depressions”
formed by the previous row of atoms:
(a) Using arrangement A, how many Rb atoms could be placed
on a square surface that is 1.0 cm on a side? (b) How many Rb
atoms could be placed on a square surface that is 1.0 cm on a
side, using arrangement B? (c) By what factor has the number
of atoms on the surface increased in going to arrangement B
from arrangement A? If extended to three dimensions, which
arrangement would lead to a greater density for Rb metal?
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