Definition
Enthalpy is a thermodynamic property of a system, representing the total heat content
The sum of the internal energy and the product of the pressure and volume of a thermodynamic system.
Enthalpy Change
The transfer of thermal energy during a reaction is called enthalpy change
Enthalpy Change = ΔH
ΔH -: Represents the heat absorbed or released in a reaction at constant pressure.
Enthalpy Changes On Exothermic And Endothermic
During exothermic reaction when energy or heat is released the enthalpy is negative
During endothermic reaction when energy is absorbed enthalpy is positive
Breaking And Creation Of Bond
When bonds are broken they cause to take in energy
When bond is created they give out energy
Bond Energy
Bond energy is the measure of the strength of a chemical bond
Bond energy is the amount of energy needed to break one mole of a chemical bond in a molecule in the gas phase.
![HOW TO ANALAYSE A PERSON, TO IF HE IS GOOD OR BAD. [MY EXPIRENCE]](https://static.wixstatic.com/media/338b83_3327cd5272eb4e17a1de3b1cab48e7a3~mv2.png/v1/fill/w_1024,h_578,fp_0.50_0.50,q_35,blur_30,enc_avif,quality_auto/338b83_3327cd5272eb4e17a1de3b1cab48e7a3~mv2.png)
![HOW TO ANALAYSE A PERSON, TO IF HE IS GOOD OR BAD. [MY EXPIRENCE]](https://static.wixstatic.com/media/338b83_3327cd5272eb4e17a1de3b1cab48e7a3~mv2.png/v1/fill/w_312,h_176,fp_0.50_0.50,q_95,enc_avif,quality_auto/338b83_3327cd5272eb4e17a1de3b1cab48e7a3~mv2.png)
How is enthalpy measured experimentally?
What role does enthalpy play in phase changes like melting and vaporization?
How do exothermic and endothermic reactions relate to enthalpy changes?
What is Hess’s Law, and how does it use enthalpy values?
How does pressure affect enthalpy in gases and liquids?
How is standard enthalpy of formation used in calculating reaction enthalpies?
What is the relationship between enthalpy and entropy in Gibbs free energy?
Keywords
Enthalpy (H)
Internal Energy (U)
Heat Transfer
Exothermic Reaction
Endothermic Reaction
Hess’s Law
Standard Enthalpy of Formation
Phase Change
Calorimetry
Thermodynamics
Gibbs Free Energy
Bond Energy
Pressure and Volume Work
Enthalpy Change (ΔH)
Chemical Reaction Energy
Heat Capacity
State Function
Enthalpy of Combustion
Reaction Spontaneity
Energy Conservation