hemical bonds is true? a. It is an electrostatic attraction that holds two atoms together. b. It involves the combination of two nuclei of different atoms. c. It involves the temporary attraction between two or more substances. d. It deals with the physical separation of substances to form another set of substances. 2. Which Lewis electron-dot diagram represents a rubidium atom? a. Rb• b. :Rb• c. Rb: d. •Rb• 3. The bond between Br atoms in a Br2 molecule is _______ and is formed by the _________ of two valence electrons. a. ionic ; sharing b. ionic ; transfer c. covalent ; sharing
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.
1. Which statement about
a. It is an electrostatic attraction that holds two atoms together.
b. It involves the combination of two nuclei of different atoms.
c. It involves the temporary attraction between two or more substances.
d. It deals with the physical separation of substances to form another set of substances.
2. Which Lewis electron-dot diagram represents a rubidium atom?
a. Rb•
b. :Rb•
c. Rb:
d. •Rb•
3. The bond between Br atoms in a Br2 molecule is _______ and is formed by the _________ of two valence electrons.
a. ionic ; sharing
b. ionic ; transfer
c. covalent ; sharing
d. covalent; transfer
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