Recent content by pa5tabear

I've heard of issues in low pressure chemical reactors where the interior scaling might flake off when a vacuum is pulled. Which principles govern this? I know it has to do with internal shear forces and am wondering if a vessel wall would ever split in half. I saw this related...

I'm curious if anyone has specific advice or experience. I'm looking for things like benefit to society, interesting work, and skills that extend to other areas. I know chemical engineers can work for most companies in the industries of semiconductor, paper, petroleum, chemical...

I think I understand, but I want to make sure. The vapor pressure of a substance is the pressure of the substance evaporating/sublimating at a given temperature and can be calculated using the Antoine Equation. This must be measured at the interface of the substance and atmosphere, or if the...

I was looking at this page and it explains the heat capacity difference between copper and water in terms of a difference in potential energy change as the molecules are heated. What does that mean? I know water has polar bonding so is it due to the water molecules having much stronger...

Thanks! So should a spin-0 particle behave differently than a spin-1 particle? I'm reading an overview of NMR and saw this: "Two or more particles with spins having opposite signs can pair up to eliminate the observable manifestations of spin. An example is helium. In nuclear magnetic...

Is this definitely true? I've heard this about electrons and their spin but this is my first time learning about proton/neutron spins.

So do all nucleons have a spin of 1/2? When is positive 1/2 or negative 1/2? The problem I'm looking at asks about the proton resonance spectrum for deuteroacetaone (D2CHCOCD3). We are concerned with the two deuteron atoms attached to the same carbon as atom as the hydrogen. Because the other...

I'm learning about NMR and it's been stated that deuteron has a spin 1 nucleus and so should exhibit different behavior. Why? I've heard of electrons having spin, and now protons, but I don't see why the spin of a neutron should matter since it's uncharged. I'm thinking a spin of 1 means...

I'm just learning about NMR... I'm thinking the difference between the two would be a larger chemical shift in the deuterium frequency band? Does that sound right?

I'm not sure I know all that I should to understand it. I'm posting to try and determine if I do. Knowing what I know, however, it seems unnecessarily confusing. Almost all students I talk to agree. Why not just call it a particle on a line segment? Or just moving in one dimension?

Ok. So what about the metal makes it respond to a magnetic field?

I saw a House episode where a person had internal bleeding because they had metal inside their body and they went into an MRI machine. I'm learning about NMR now and I want to try and understand it more.

We are learning about NMR and ESR right now. I know physical chemistry is a difficult topic to learn because there is a lot of background information that you have to be aware of in order to understand things. My professor does not reference these background topics, speaks with a strong...

I'll post this up in a few places at my university.

What causes flame color? I know light color corresponds to photon energy which is related to electrons relaxing from a high to low energy state. I'm not sure how to conceptualize this situation though. My professor was heating a 0.8 wt% carbon steel rod, in austenite phase, with a blow...