Bond Energies

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Mike Vinci 2B
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Joined: Fri Sep 29, 2017 7:03 am
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Bond Energies

Postby Mike Vinci 2B » Sun Jan 21, 2018 2:34 pm

Hey Chemistry Community,
Professor Lavelle mentioned that bonds absorb energy as a positive value, however I always that that bonds held some form of energy (could be minuscule). With this being said, when you add energy and break bonds (especially double and triple bonds), wouldn't energy be given off as a negative value?

Krupa Prajapati
Posts: 50
Joined: Sat Jul 22, 2017 3:00 am

Re: Bond Energies

Postby Krupa Prajapati » Sun Jan 21, 2018 3:47 pm

Hi! When elements form bonds they are in a more stable state and thus have a lower potential energy. Thus, when we form bonds energy is released as atoms move to this lower potential energy. This value is negative, as energy is being released (energy of products (atoms in a bond) < energy of reactants (free atoms)).

When we want to break bonds, an input of energy is required because atoms are in their lower potential energy states and don't want to be free floating atoms. We need to input energy to break these bonds apart, and thus energy is consumed, as a positive value. Energy of products (free atoms) > energy of reactants (atoms in a bond).

Hope this helps!


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