Questions tagged [chemical-compounds]

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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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The physical materials (elements and compounds) of the JWST

How many different periodic table elements and compounds are used in the JWST, and where are they used in the telescope? My current list is the following, but I am surely missing many others. Can you ...
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Calculating Enthalpy of formation versus Calculating Enthalpy of a reaction not occurring at standard conditions

My understanding of Hess's law and its use in determining the change of enthalpy of a reaction has been challenged recently. Up until recently, I thought that the only way to calculate a chemical ...
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Is it possible to make methane visible?

:) It is just a curiosity question. Under the right conditions, I could clearly see a shadow of warm/cold air. But methane won't create any such shadows. Is there any tool/method that I could use to ...
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Will an induced electric field reduce the reaction time between two substances?

I've built a Van de Graaff generator that can generate 500,000 volts. When I tried pushing co2 from a tank into a flask of sodium hydroxide solution, it took approximately 3 minutes before the co2 and ...
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33 votes
2 answers
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Why isn't the molecule of water linear straight?

When you see models of water you see something like this: The hydrogens in the water molecule become negatively charged because the oxygen pulls electrons more. So why don't they repel and move to ...
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1 answer
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Degrees of Freedom contributing to dynamic?

I had a question regarding considering how many degrees of freedom (dof), contributing to dynamics, a $\rm CCl_4$ Molecule has. In General there are 5 Atoms in the Molecule, so the maximum would be 15,...
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3 votes
1 answer
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Role of methane in global warming

I am a young student in physic and I am doing a little presentation on how does climate change works. So I went on the wikipedia page for greenhouse gases. I don't understant why methane is more ...
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1 answer
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Meaning of notation: $\mathrm{Sm}\left(\mathrm{Fe}_{0.8} \mathrm{Co}_{0.2}\right)_{12}$

I am reading a research paper about magnetic materials based on $\mathrm{SmFe_{12}}$ compounds (https://doi.org/10.1016/j.actamat.2020.05.026). They talk about the material $\mathrm{Sm}\left(\mathrm{...
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Why aren't common magnets made of magnetite, $\rm Fe_3O_4$? Instead of ferrite, $\rm Fe_2O_3$?

Why are common, simple, cheap magnets like refrigerator magnets made (usually) of hematite ($\rm Fe_2O_3$) in some form, like 'ferrite', instead of the more magnetic and magnetizable magnetite ($\rm ...
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Why is Earth's atmosphere made almost entirely of $\rm N_2$ and $\rm O_2$ molecules rather than any of the nitrogen oxides?

I assume the formation of $\rm N_2$ and $\rm O_2$ molecules is energetically favorable compared with N2O, NO, and NO2, etc., but are there some more intuitive arguments regarding the bonding and ...
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What would be preferred site for $\rm N$ and $\rm B$ co-doping in the ethylcyclohexane?

I want to replace two carbon of ethylcyclohexane: one $\rm C$ with $\rm B$ and the adjacent $\rm C$ with $\rm N$ in my hydrocarbon. Could you please explain me with possible reason that where can I ...
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What does '%BZ' mean in materials science?

Also, for that matter, what does k_II mean?
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Simulating breaking bonds in molecular dynamics

How does one introduce the possibility of breaking a bond in a molecule during MD simulation? I only found the cases when we just introduce the harmonic potential $U_{ij} = \frac{1}{2}k(r_i - r_j)^2$ ...
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How does ski wax (nonpolar liquid) dissolve into polyethylene (nonpolar plastic)?

Ive been reading alot about ski waxing and a reputable source said that when you iron in paraffin wax into the base of a ski or snowboard, the wax melts from the heat of the iron and dissolves into ...
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1 answer
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Benzene ground state

I’m currently studying my first course on Quantum Physics. Regarding the topic of Sommerfeld’s quantization rules, I’ve come across a problem where I was asked whether a benzene molecule would require ...
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Microscopic interpretation of constant voltage from Battery

I don't know if this is the right place to ask(Maybe it's more related to chemistry), but this has been troubling me for some while. Consider you have a chemical cell. Then the reason for the ...
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What does the subindex $x$ in $\text{Bi}_{1-x}\text{Sb}_{x}$ mean?

I am currently reworking our condensed matter lecture. We shortly discussed topologic insulaters at the example of $$\text{Bi}_{1-x}\text{Sb}_{x}$$ I am not sure what the $x$ stands for. Normally ...
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Why is 99% isopropyl alcohol preferred for a DIY cloud chamber?

Simple cloud chamber construction is described in various places and all seem to use 90% - 99% isopropyl alcohol as a start. What property does this have that makes it an essential component for ...
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2 votes
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How to simulate the formation of chemical bonds by calculating electrodynamic forces?

I had the idea recently that if the interactions between atoms could be calculated, that a large enough computer could simulate biological processes. What would I need to know to simulate something ...
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1 vote
1 answer
152 views

Covalent bonding in cuprates

In high temperature cuprate superconductors like YBCO, there are intermediate copper-oxide planes, where $Cu$ and $O$ atoms are arranged alternatively in a square lattice. In this arrangement, the $Cu$...
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1 answer
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Increase the surface tension of polypropylene

I'm working on a project and I need to increase the surface energy of polypropylene. I want you to tell me a way in order to increase surface energy of polypropylene?
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-1 votes
1 answer
437 views

Increasing the melting point of metal

I need to know how one can increase the melting point of a metals like steel, tungsten or ... about 500 degrees and without destroying its shape?
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5 votes
1 answer
292 views

In chemical compounds, where does the "magic" come from in atomic "magic numbers"?

It is well known that atoms with a full electron shell are more stable, it is one of the first facts taught in a middle school Chemistry course: "An element whose atoms have no electrons outside ...
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1 vote
1 answer
533 views

What is the temperature at which Napalm burns?

I was sitting during a lecture last week in one of my classes, and we were talking about chemical warfare and the history behind it. My teacher had brought up the use of Napalm during Vietnam. After a ...
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1 vote
2 answers
186 views

Why is gaseous carbon dioxide transparent? [closed]

Some carbon-heavy products of combustion, e.g. soot, are black, as is carbon in other forms, e.g. graphite. This seems to suggest that carbon is black. But then how can $\text{CO}$ (carbon monoxide) ...
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1 answer
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How is aerogel made? [closed]

Aerogel is a promising material capable of a high thermal insulation. What is the production process of aerogel, is it a cheap technology?
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Bond Nature of a comound [closed]

How can we determine the type of Bond in LiBaPO4? can we find out the nature of bond through charge transfer values of these elements? if yes then how?
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4 answers
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Do CFCs get emitted in air from appliances?

Do the refrigerators and air conditioners that use CFC or HCFC cause damage to the environment even when they are working normally. I mean, is there any gas emission under normal conditions when the ...
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Carrying 10 liter dewar in elevator advisable? [closed]

I am using liquid nitrogen a lot at university and frequently have to carry a 10 l dewar from the storage container into my lab. On this way I have to walk down 4 stories with the heavy dewar. ...
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2 answers
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How to quantify the mixing of two hard-spheres gases?

Suppose that there are two types of hard-spheres gases ($a$ and $b$) in a box. Suppose that their radius is much smaller than the box's characteristic size. These two gases tend to repel each other. ...
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1 vote
2 answers
567 views

What happens to the chlorine in epichlorohydrin when a two-part epoxy is air-cured?

Where does the chlorine go? Does it evaporate as a by-product or does it remain in the epoxy? I'm using a two-part resin and hardener and curing them at room temp. The resin is bisphenol-A-...
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When we mix water with H$_2$SiF$_6$ and boil them, how much of the H$_2$SiF$_6$ evaporates?

If water evaporates also at temperatures much lower then its boiling point, and so do, I believe, other liquids, how much H$_2$SiF$_6$ (boiling temp. 108 C) is to be found in the steam over boiling ...
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1 vote
1 answer
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Are there other properties besides lower boiling point that make isobutane a better refrigerant than butane?

Asked differently, if -1C is low enough for the application is there any reason not to use butane rather than isobutane as the working fluid in a refrigeration system?
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2 votes
0 answers
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What do the planets in our solar system smell like? [closed]

For example, if Jupiter is mostly hydrogen and and helium, but has ammonia clouds, does that mean it smells like a cat's litterbox? Does Mars smell like iron? Asking in order to give kids a more "...
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-1 votes
2 answers
544 views

Is there any non-metallic oxide that remains in solid state at room temperature?

Except for metallic and semimetallic oxides, is there any oxide (non-metallic oxide) which remains in the solid state at room temperature?
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1 answer
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What is chemical binding energy? [duplicate]

Like in nuclear physics we deal with binding energies, i heard someone saying Chemical binding energy. What is that and how a chemical reaction follows mass energy interconversion based on this ...
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1 answer
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Why is liquid fat transparent and solid fat opaque?

While frying some chicken I was wondering why the fat becomes transparent when melting. As far as I know, transparency is caused by the fact that the substance can't absorb photons of visible light (...
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-3 votes
1 answer
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Can I ice skate on toluene?

I thought about that can I ice skate on toluene? We can ice skate on ice but can we do it on ice? Please help me it would be helpful for me
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4 votes
1 answer
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Why does Sugar form a crystal structure?

I always wondered about the question why Sugar dissolves like salt, without being ionic. Now my question is: How does sugar forms a crystal if it is a covalent compound? Are there very strong IMF's?...
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Bubble Formation in Froth Flotation process

I've recently attended a lecture on the metallurgical process of froth flotation. To make us understand froth, my teacher gave us the example of soap bubbles. But in actual practice, the flotation ...
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Smallest Aperture for $HCl$ to pass through [duplicate]

What is the smallest aperture that hydrochloric acid could pass through, such that the acid's surface tension wouldn't be stopping it from flowing through? Also, how would I work that out? I'm testing ...
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1 answer
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Pressurizing with nitrogen vs vacuum? [closed]

pressurizing with vacuum causes volatilization of liquid.
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1 answer
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Equivalent in wood/coal/methane of one litre of petrol

I want to create a visual comparison between different sources of energy. I would like to show how much wood, coal, methane, water+level difference, etc. could potentially generate the same energy of ...
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1 vote
1 answer
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Phase diagram mixture nitrogen oxygen

Consider a phase diagram of Oxygen Nitrogen. Now my question is : if a take a box containing air (80 % N2 - 20 % O2) at standard pressure and I start cooling it from room temperature to -196°C (BP of ...
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1 vote
1 answer
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Which Liquids freeze when combined? [closed]

Are there any liquids (or liquid and solution) that when combined react to where they will freeze?
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5 votes
1 answer
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Why soap bubbles are made of soap?

Why are soap bubbles made of soap? What I know is to have stability in bubble, waterproofing agents should me mixed, but soaps are water wetting agents, and water wetting agents will decrease angle ...
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1 vote
0 answers
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strengths of the 3D printed part [closed]

If the material is manufactured by 3D printing (laser sintering) then what will be change in its mechanical properties than the properties by conventional one? What would be appropriate failure ...
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1 vote
1 answer
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Ion combination energies

This is somewhat out of my comfort zone, and therefore I may not be using the correct terminology. Basically, there are some promoters of a certain woo, that claim solar wind H+ can combine with O-. ...
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2 answers
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Electrically non-conductive molten salts

I'm researching an idea for molten salt as a coolant. The information that I lack is the conductivity of molten salts. The basic question is "what are the best insulating molten salts?" Comparisons ...
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