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.
Intermolecular Forces and Physical Properties of Pure Substances
Which has the greatest vapour pressure at 25°C?
SO2
H2O
CO2
O3
Which has the greatest viscosity?
CH3CH2OH
CH3(CH2)4CH3
HOCH2CH2OH
HOCH2CHOHCH2OH
Which has the least heat of vaporization?
H2Te
Xe
H2Se
H2S
Which has the highest enthalpy of fusion?
Li2O
HCl
H2O
MgO
Which has the smallest heat of vaporization?
PH3
CH4
H2O
H2S
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