ENTHALPY CHANGE Meaning and
Definition
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Enthalpy change refers to the measurement of heat energy transfer that occurs during a chemical reaction or physical change, often at a constant pressure. It is a significant concept in thermodynamics and is denoted by the symbol ΔH.
Enthalpy, denoted by the symbol H, is a thermodynamic property that represents the total heat energy present in a system. It combines the internal energy of the system with the energy associated with pressure and volume. Enthalpy change specifically represents the difference in enthalpy between the reactants and the products in a chemical reaction.
Enthalpy change can be positive or negative, depending on whether the reaction is exothermic or endothermic. In an exothermic reaction, the energy released is transferred to the surroundings, resulting in a negative enthalpy change. Conversely, in an endothermic reaction, energy is absorbed from the surroundings, leading to a positive enthalpy change.
Enthalpy change can be determined using various methods, including calorimetry or Hess's Law. Calorimetry involves measuring the heat exchange between the reaction and its surroundings, while Hess's Law relies on the principle of conservation of energy to calculate the enthalpy change based on known values of other reactions.
The concept of enthalpy change is crucial for understanding energy conversions in chemical reactions and plays a fundamental role in fields such as chemical engineering, thermodynamics, and material science. By quantifying the heat energy involved, enthalpy change allows scientists and engineers to predict and optimize various chemical processes and reactions.
Common Misspellings for ENTHALPY CHANGE
- wnthalpy change
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Etymology of ENTHALPY CHANGE
The word "enthalpy" originated from the Greek word "enthalpein", which means "to heat" or "to warm". It was first introduced by the Dutch physicist Heike Kamerlingh Onnes in the late 19th century. He used this term to describe the heat content of a system. Over time, the concept of enthalpy was further developed and integrated into the field of thermodynamics.
The addition of "change" to the term "enthalpy" in the context of "enthalpy change" refers to the difference or variation in enthalpy between two states of a system. It is often measured during a physical or chemical process, and it represents the heat exchanged between the system and its surroundings.
