The valence of an element (note that this is NOT THE SAME as “the valence electrons”) is the number of covalent bonds its atom usually forms (or the charge on the ion it forms in ionic compounds, but this is mostly NOT in our scope). Note that you are responsible for the lone pairs 7A. The most common valence of nitrogen is ______________; the most common valence of N+ is __________. 7B. The most common valence of sulfur is ______________; the most common valence of S- is ____________. 7C. The most common valence of Si is ______________; the most common valence of Si+ is _____________
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 valence of an element (note that this is NOT THE SAME as “the valence electrons”) is the number of covalent bonds its atom usually forms (or the charge on the ion it forms in ionic compounds, but this is mostly NOT in our scope). Note that you are responsible for the lone pairs
7A. The most common valence of nitrogen is ______________; the most common valence of N+ is __________.
7B. The most common valence of sulfur is ______________; the most common valence of S- is ____________.
7C. The most common valence of Si is ______________; the most common valence of Si+ is _____________.
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