Bond energy value signs

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rkang00
Posts: 69
Joined: Fri Sep 28, 2018 12:25 am

Bond energy value signs

Postby rkang00 » Sun Nov 11, 2018 9:30 pm

Why are the bond energy signs all negative? They're all attractive forces that result from subtraction but I don't get why they're results of subtraction and why they're negative.

armintaheri
Posts: 68
Joined: Fri Sep 28, 2018 12:26 am

Re: Bond energy value signs

Postby armintaheri » Sun Nov 11, 2018 11:47 pm

Because energy is released when a bond forms. Since energy is leaving the system, the sign is negative.

404536963
Posts: 29
Joined: Fri Feb 02, 2018 3:02 am

Re: Bond energy value signs

Postby 404536963 » Sun Nov 11, 2018 11:53 pm

Yes I agree. Energy is released to break bonds, so it is positive. It is leaving the system. Energy is needed to make bonds, so it is negative. It is using up energy around to break it.

Xingzheng Sun 2K
Posts: 62
Joined: Fri Sep 28, 2018 12:29 am

Re: Bond energy value signs

Postby Xingzheng Sun 2K » Wed Nov 14, 2018 7:21 am

Energy is needed to break a bond and is released to form a bond. You also can understand by looking at the energy equation which starts with a negative sign.


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