Questions tagged [chemical-compounds]
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How does mass-energy equivalence work with chemical bonds? [duplicate]
If you have, for instance, 2 oxygen atoms and do E=mc2 to get their equivalent energy, you get about 2.38nJ. However, if you have diatomic oxygen, there's also the energy of the bond; about 0.8aJ. ...
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Flatband with our Moire Physics
Is there any material Class available where the lattice vectors are in the order of several nm instead of Angstrom? I am looking for some exotic not well studies lattice class which can be ...
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Spectroscopy on colored flames
When observing colored fire through a spectrometer after adding substances like copper chloride or magnesium sulfate to change its color, what specific spectra are typically observed? How does the ...
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Why are things electronegative and electropostive?
Chemical reactions happen because of electron donation. Atoms already have an equal amount of proteins and electrons, so they should cancel out and the atom should not have to steal/donate electrons. ...
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Nature of absorption spectra peaks similar profile in Dimethyl sulfide (C$_2$H$_6$S)
I was reading interesting article about possible life signs detection in exoplanets, where JWS telescope have captured that exoplanet K2-18 b atmosphere has Dimethyl sulfide traces. This chemical ...
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Understanding enthalpy and gibbs energy changes in a reaction
I was looking at the enthalpy change for water-splitting reaction:
$$ \Delta H^o_R = [\Delta H^0_{H_2(g)} +\frac{1}{2}\Delta H^0_{O_2(g)}]-\Delta H^0_{H_2O(l)} = 285.83 kJ/mol$$
According to the ...
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What is the difficulty of determing the products of nuclear fission?
In my impression, initially many people did not believe that an Uranium nucleus disintegrates into two halves when bombared with neutrons.
Experimentally, there must be some difficulty to determine ...
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Why can a material mixture block all light?
Dyes and different colorings are often mixed into materials. These are usually a small fraction of the total material volume/mass and aren't painted on so don't have a uniform surface coat but some ...
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Gibbs energy calculations for compounds
I am studying machine learning during my master's degree and have a simple task. I am using the FactSage Pure Substance Database (https://www.crct.polymtl.ca), which provides a list of phases for a ...
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How much $\rm D_2O$ is in Earth's icepacks? [closed]
How much $\rm D_2O$, by mass and/or percentage, is locked in Earth's polar icepacks? Is the $\rm D_2O$:$\rm H_2O$ ratio the same as elsewhere?
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Difference between Reversible and Irreversible processes in Physics vs. Chemistry
In Physics a reversible process is defined as one in which the system can be returned to its initial conditions via the same path (along the PV Diagram), and every point along the path is an ...
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Strange occurrence of glue drying
What happened here? I by accident spilled super glue and formed these amazing ridge patterns. Any ideas what caused this to happen?
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Can we call rusting of iron a combustion reaction?
In case of rusting of iron the chemical reaction is not fast enough. The oxygen used is not molecular oxygen from the atmosphere but it is the oxygen from water molecule. The reaction is not rapid and ...
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Do diamagnets, such as graphite, have a Curie point?
Since graphite can be heated by induction, can it also lose its magnetism at a certain temperature just like ferromagnetic metals? And what about materials such as graphene(that is also from carbon) ...
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Why does the air pressure not increase when I shake a coke bottle?
I tried this experiment lately and this happened, I shook a coke bottle and its air pressure remained the same but the coke came squirting out when I opened the lid. How is this possible?
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