A chemical reaction proceeds with a decrease in both enthalpy and entropy. This reaction will be spontaneous when ∆H=T∆S Answer ii) Spontaneous change is accompanied by an increase in internal energy or enthalpy. Answer iii) The entropy of a system and its surroundings always increases for a spontaneous change. Answer
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.
her the following statements are TRUE or FALSE
i) A
ii) Spontaneous change is accompanied by an increase in internal energy or enthalpy. Answer
iii) The entropy of a system and its surroundings always increases for a spontaneous change. Answer
iv) The efficiency of a heat engine is maximum when the temperature of the source is minimum and that of the sink is maximum. Answer
v) The efficiency of a heat engine operating between 1000 K and 200 K is greater than the engine operating between 1000 K and 500 K. Answer
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
