RC

# In chemistry, a bond is a lasting attraction between atoms that enables the formation of chemical compounds. A bond is usually considered to be the force that holds atoms together in a chemical compound. The bond may result from the electromagnetic force, the force of attraction between nuclei for atoms and molecules, or a combination of these forces. The bond strength is directly proportional to the atomic or molecular binding energy.

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##### Christina K.

Rutgers, The State University of New Jersey

##### Andy C.

University of Michigan - Ann Arbor

##### Jared E.

University of Winnipeg

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### Video Transcript

Welcome to our fourth example video. Looking at bonds and condensed matter physics this video. We're going to compare temperatures that which I helium to molecule will separate to when a hydrogen to would become unstable. That is, when you would be able to pull apart these two hydrogen versus when you would be able to pull apart these two helium. Now we're going to step away a little bit from condensed matter physics here and go back to our idea of the ideal gas where we said that the temperature was related to the energy. By this equation. Three halfs K Times T, where K is bolts mons constant and T is the temperature of the gas. Now the reason we do this is because hydrogen to and helium to we would generally expect to find in a gas. Now, hydrogen to is fairly common. It's a co violent bond. You're probably familiar with it, but helium to, on the other hand, is not common. In fact, the only way to make this happen is with a Vander Wal's bond. So remember Vander Waals bonds are significantly weaker than hydrogen bonds, so what we're going to do is look at how much weaker are they really so plugging our energy for our bond into this equation? What we find is that you only need a temperature above six kelvin to pull apart these two helium. So, in fact, you have to reduce the temperature of helium to a very, very minuscule temperature that is below six. Kelvin. In order to actually get thes thio stick together, it's a hard to get them to stick together due to a vander Waals bonds, On the other hand, for the hydrogen, with its Covalin bond that has an energy of 4.48 e V notice here that it's 10 to the four times larger. You end up with a temperature that is 34,600 kelvin. So you need an extremely high temperature to make hydrogen to disassociate into two separate hydrogen. So it really emphasizes here the difference between a weak bond that is the Vander Wal's bond and a very strong bond. That being the Covalin Bond

RC
University of North Carolina at Chapel Hill

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##### Christina K.

Rutgers, The State University of New Jersey

##### Andy C.

University of Michigan - Ann Arbor

##### Jared E.

University of Winnipeg