Bond Strength and Enthalpy
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Bond Strength and Enthalpy
Does bond strength affect the change in enthalpy of a reaction? If so, how? In addition, how does the bond being a single/double/triple affect the change in enthalpy of the reaction?
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Re: Bond Strength and Enthalpy
Yes, bond strength can affect the change in enthalpy of a reaction. The bond strength refers to the energy required to break a chemical bond and is related to the bond dissociation energy (BDE). In general, reactions that involve breaking strong bonds (high BDE) and forming weak bonds (low BDE) will have a large positive delta H, meaning that energy must be absorbed for the reaction to proceed. On the other hand, reactions that involve breaking weak bonds and forming strong bonds will have a negative delta H, meaning that energy is released in the reaction.
As for the bond being a single, double, or triple bond, it can also affect the delta H of a reaction. Double bonds are typically stronger than single bonds, and triple bonds are stronger than double bonds. As a result, breaking a double bond or a triple bond usually requires more energy than breaking a single bond. The change in the bond strength when bonds are broken and formed can therefore influence the ΔH of a reaction.
As for the bond being a single, double, or triple bond, it can also affect the delta H of a reaction. Double bonds are typically stronger than single bonds, and triple bonds are stronger than double bonds. As a result, breaking a double bond or a triple bond usually requires more energy than breaking a single bond. The change in the bond strength when bonds are broken and formed can therefore influence the ΔH of a reaction.
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Re: Bond Strength and Enthalpy
The stronger the bond, the more energy it requires to be broken! Triple bonds are the strongest, followed by double, and then lastly single bonds! This means that triple bonds require the most energy to break whereas single bonds require the least amount.
Re: Bond Strength and Enthalpy
I think it is also important to add that the strength of the bond determines if the reaction is endothermic or exothermic. Stronger bonds tend to be exothermic because more energy is required to break them so more energy is released, where as weaker bonds do not need a ton of energy to be broken so energy is absorbed.
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