Energy Changes

Energy Changes

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The variations in energy in a chemical reaction are due to variations between materials and reactants in the amount of extracted chemical energy. This accumulated chemical energy, or heat content, is called enthalpy of the cell.

Breaking and making bonds

During a chemical response:

  • Bonds are broken in the reactants


  • new commodity bonds are formed


  • Heat must be used to sever bonds. The endothermic cycle is bond forming.


  • As new bonds form, energy is released. An exothermic cycle is the formation of bonds.


  • The difference between the energy required to break bonds and the energy released as new bonds form depends on whether the reaction is endothermic or exothermic.


  • If the bonds emit more heat than was consumed, the reaction becomes exothermic


  • When more heat is taken into account than released when forming the bonds, the reaction becomes endothermic


Read also: Air and Atmosphere


Energy diagrams

Energy diagrams

The energy level of the reactants and products is seen in energy diagrams. The difference between reactor energy and commodity energy, the more energy is produced or consumed.

It is easy to see that the reaction is exothermic or endothermic from an energy level diagram

  • Reactants are stronger than products in exothermic reactions


  • Reactants are weaker than products in endothermic reactions

Energy diagrams 2

An exothermic reaction energy degree diagram

The compounds are less effective in an exothermic reaction than the reactants. The difference between reactant energy and product energy is considered the enthalpically shift (after all), the reaction’s enthalpy.

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The shift in enthalpy is often negative for an exothermic reaction.

An Endothermal Reaction Power Rate Diagram

The compounds have more energy than the reactants in an endothermic reaction. This means that the improvement in the reaction’s enthalpy (alternative to H) is fine.

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For the measurement of the molar enthalpy shifts of a reaction, calorimetry assay results are used.

You must consider the density – or volume of the heated water, the difference in the temperature of the atmosphere, and the amount or number of moles in the controlling reactant (for example the burning fuel or the added solution).

Using this equation to achieve a shift in energy:

Energy transported = water heated mass = basic water heat efficiency = increase in temperature.

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