Chapter 5: Chemical Energetics

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Last updated 5:48 AM on 6/30/26
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4 Terms

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Enthalpy VS Enthalpy Changes

Enthalpy:

  • It is the total chemical energy of a substance (heat content)

  • Chemical energy consists of:

    • Kinetic energy

    • Potential energy (main component of C.E.)

      • Main component due to electrostatic attraction between the particles

Enthalpy Change:

  • It is the energy change

    • During a chemical reaction, bonds are broken and new bonds are formed

    • The breaking of bonds requires energy while the formation of bonds releases energy

  • Symbol of enthalpy change: ΔH

  • Units of ΔH: J mol–1 or kJ mol–1

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Endothermic VS Exothermic

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m

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m