Comments on: When bonds are formed what happens to bond energy? http://www.uicinvestors.org/bonds/when-bonds-are-formed-what-happens-to-bond-energy Sun, 07 Aug 2011 02:09:59 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Paul B http://www.uicinvestors.org/bonds/when-bonds-are-formed-what-happens-to-bond-energy/comment-page-1#comment-4297 Paul B Sun, 21 Feb 2010 01:26:59 +0000 http://www.uicinvestors.org/bonds/when-bonds-are-formed-what-happens-to-bond-energy#comment-4297 The bond energy is defined as equal to the amount of energy given out when the bond is made (or absorbed when that the bond is broken). So when a bond is made, and the system cools to its original energy, the amount of energy given out, -DeltaH, is more or less equal to the bond energy. Noticed that minus sign. For a process that releases heat, DeltaH is negative.<br><b>References : </b><br> The bond energy is defined as equal to the amount of energy given out when the bond is made (or absorbed when that the bond is broken).

So when a bond is made, and the system cools to its original energy, the amount of energy given out, -DeltaH, is more or less equal to the bond energy.

Noticed that minus sign. For a process that releases heat, DeltaH is negative.
References :

]]> By: kumorifox http://www.uicinvestors.org/bonds/when-bonds-are-formed-what-happens-to-bond-energy/comment-page-1#comment-4296 kumorifox Sun, 21 Feb 2010 00:36:59 +0000 http://www.uicinvestors.org/bonds/when-bonds-are-formed-what-happens-to-bond-energy#comment-4296 When bonds break, energy has to be supplied. When bonds form, energy is released. If the total energy released from forming bonds is higher than the total energy absorbed from breaking bonds, the reaction is exothermic; if it is the other way around, the reaction is endothermic. A specific bond will always have a specific energy; bond energy does not change. It can be affected by the chemical surroundings, but in a specific setting, it is constant.<br><b>References : </b><br> When bonds break, energy has to be supplied. When bonds form, energy is released. If the total energy released from forming bonds is higher than the total energy absorbed from breaking bonds, the reaction is exothermic; if it is the other way around, the reaction is endothermic.

A specific bond will always have a specific energy; bond energy does not change. It can be affected by the chemical surroundings, but in a specific setting, it is constant.
References :

]]>