utv
Badges: 14
Rep:
?
#1
Report Thread starter 1 year ago
#1
is bond enthalpy equal to the amount of energy in the bond? I am confused as to why we can calculate change by enthalpy of reactants-enthalpy of products

I understand energy required to break the bonds-energy required when bonds form. but is the energy released when new bonds form equal to the energy required to break the bonds and therefore the amount of energy in the bond?
0
reply
charco
Badges: 17
Rep:
?
#2
Report 1 year ago
#2
(Original post by utv)
Is the energy released when new bonds form equal to the energy required to break the bonds?
equal in magnitude, but opposite in sign
0
reply
utv
Badges: 14
Rep:
?
#3
Report Thread starter 1 year ago
#3
thanks for your help so much. I can't leave a rep as I've reped you lots and it won't allow me. I really appreciate it.


is it to do with electrons in orbitals and their energy levels? why the magnitude is equal?
0
reply
charco
Badges: 17
Rep:
?
#4
Report 1 year ago
#4
(Original post by utv)
thanks for your help so much. I can't leave a rep as I've reped you lots and it won't allow me. I really appreciate it.


is it to do with electrons in orbitals and their energy levels? why the magnitude is equal?
All bonds are electrostatic in nature, so it does involve the electrons.

Have you heard of a potential energy well?

Image
0
reply
utv
Badges: 14
Rep:
?
#5
Report Thread starter 1 year ago
#5
I'm in year 12 so no we havent learnt it but I have a really tough understanding

is it to do with the bonding pair being at a low energy level . but when atoms are formed due bonds absorbing energy electrons are at a high energy level

when energy is released when bonds form, electrons go from a high energy level to a lower energy level(the energy level of the bonding pair) and when this happens energy eg UV light is released?
0
reply
charco
Badges: 17
Rep:
?
#6
Report 1 year ago
#6
(Original post by utv)
I'm in year 12 so no we havent learnt it but I have a really tough understanding

is it to do with the bonding pair being at a low energy level . but when atoms are formed due bonds absorbing energy electrons are at a high energy level

when energy is released when bonds form, electrons go from a high energy level to a lower energy level(the energy level of the bonding pair) and when this happens energy eg UV light is released?
Molecular orbital model
The electrons occupy a molecular orbital, which is at lower energy than the atomic orbitals that they occupied before bonding.

The above is a model, which explains empirical observations.

However, as I have already said, bonding is fundamentally electrostatic interactions between electrons and the nuclei of the bonded atoms. The atoms occupy a position at which the attractions are maximised and the repulsions minimised.

The whole thing is at lower potential energy than before (potential energy well).
0
reply
utv
Badges: 14
Rep:
?
#7
Report Thread starter 1 year ago
#7
great thank you very much
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Have you experienced financial difficulties as a student due to Covid-19?

Yes, I have really struggled financially (9)
14.75%
I have experienced some financial difficulties (11)
18.03%
I haven't experienced any financial difficulties and things have stayed the same (28)
45.9%
I have had better financial opportunities as a result of the pandemic (10)
16.39%
I've had another experience (let us know in the thread!) (3)
4.92%

Watched Threads

View All
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise