Dissociation energy

(Polar molecules, Non-polar molecules, etc.)

Moderators: Chem_Mod, Chem_Admin

Shreya Tamatam 3B
Posts: 30
Joined: Fri Sep 28, 2018 12:25 am

Dissociation energy

Postby Shreya Tamatam 3B » Sat Dec 01, 2018 12:20 pm

Why is dissociation energy always positive?

Dayna Pham 1I
Posts: 98
Joined: Fri Sep 28, 2018 12:16 am
Been upvoted: 3 times

Re: Dissociation energy

Postby Dayna Pham 1I » Sat Dec 01, 2018 12:41 pm

Dissociation energy is the energy required to break a covalent bond. I believe that dissociation energy is positive because a positive change in energy is required to break a bond (gains energy) while a negative change in energy is required to make a bond (loses energy).

Ariel Cheng 2I
Posts: 67
Joined: Fri Sep 28, 2018 12:29 am

Re: Dissociation energy

Postby Ariel Cheng 2I » Sat Dec 01, 2018 2:54 pm

When bonds are formed, energy is released (negative) as atoms move toward a more stable state. The opposite, the breaking of bonds, would therefore require an input of energy (positive) in order to pull atoms away from that stable state.

Katie Sy 1L
Posts: 57
Joined: Fri Sep 28, 2018 12:18 am

Re: Dissociation energy

Postby Katie Sy 1L » Sat Dec 01, 2018 3:44 pm

positive refers to an input of energy vs negative would be a release of energy

Aleeque Marselian 1A
Posts: 60
Joined: Fri Sep 28, 2018 12:24 am

Re: Dissociation energy

Postby Aleeque Marselian 1A » Sat Dec 01, 2018 5:39 pm

Dissociation energy is always positive because it is the energy required to break a bond, therefore it would require an input of energy, which is always positive. However, to form a bond, energy would have to be released, resulting in a negative charge.

Alli Hinmon 3E
Posts: 30
Joined: Wed Nov 08, 2017 3:00 am

Re: Dissociation energy

Postby Alli Hinmon 3E » Sat Dec 01, 2018 6:58 pm

The dissociation energy is the energy required to break a bond. The greater the bond strength the greater the dissociation energy must be. This is a way to look at the dissociation E as a positive value. I think of it as going from weak (small value) to a strong (large value) bond. Weak -> big atomic radius, more LP repelling, -> little stronger -> more bonds, -> strongest -> ION-ION.

SophiaKohlhoff4B
Posts: 30
Joined: Fri Sep 28, 2018 12:16 am

Re: Dissociation energy

Postby SophiaKohlhoff4B » Sun Dec 02, 2018 3:06 pm

Dissociation energy is the energy required to break a bond. When bonds are formed, energy is released bc the molecule becomes more stable. When bonds are broken, energy must be added (positive) as to bring the atoms to less stable states (higher energy levels).

Gillian Ward 1F
Posts: 61
Joined: Fri Sep 28, 2018 12:27 am

Re: Dissociation energy

Postby Gillian Ward 1F » Sun Dec 02, 2018 4:37 pm

Because dissociation energy is an addition of energy to break a bond it is going to be positive.


Return to “Determining Molecular Shape (VSEPR)”

Who is online

Users browsing this forum: No registered users and 3 guests