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MHT-CET : Chemistry Entrance Exam

MHT - CET : Chemistry - Chemical Thermodynamics and Energetics Glossary

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                     Thermodynamics: It is the study of empirical relationships between heat and energy like potential, kinetic, light, mechanical, etc.

                     Chemical Energetics: It is the study of heat and energy changes in chemical reactions and physical processes.

                     Endothermic Reactions: The reactions in which heat is absorbed are called endothermic reactions.

                     Exothermic Reactions: The reactions in which heat is evolved are called exothermic reactions.

                     System: A part of the universe under thermodynamic study is system.

                     Surroundings: The rest of the universe other than that selected for thermodynamic study is called surroundings.

                     First Law of Thermodynamics: Total energy of the universe is constant. E = mc2

                     Open System: A system that exchanges matter and energy with its surroundings is called an open system. .

                     Closed System: A system that can exchange only energy but not matter with its surroundings is called a closed system.

                     Adiabatic Process: A process in which there is no exchange of heat with the surroundings is called an adiabatic process.

                     Isothermal Process: A process which is carried out at constant temperature is called an isothermal process.

                     Extensive Properties: The properties which depend on the quantity of matter present in the system, e.g., mass, volume, internal energy and enthalpy are called extensive properties.

                     Intensive Properties: The properties that do not depend on the quantity of matter present in the system, e.g. temperature, pressure, density and boiling point, are called intensive properties.

                     Enthalpy: It is a quantity associated with a thermodynamic system and is expressed as the internal energy of system and product of pressure and volume of the system.
H = E + PV

                     Enthalpy Of Formation: It is the heat change when 1 mole of compound is formed from its elements.

                     Enthalpy Of Combustion: It is the heat evolved when 1 mole of substance burns completely.

                     Enthalpy of Neutralisation: It is the heat evolved when 1 equivalent of an acid is neutralised completely with 1 equivalent of a base.

                     Hess's Law: This law states that heat change in a chemical reaction is the same whether the reaction takes place in one stage or several stages.

                     Thermochemistry: It is the branch of chemistry that deals with enthalpy changes accompanying chemical changes.

                     Kirchhoff's Equation: The equation dealing with the effect of temperature on the heat of reaction at constant pressure or at constant volume.
DH2 - DH1 = DCp (T2 - T1)
DE2 - DE1 = DCv (T2 - T1)

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