Questions tagged [chemical-compounds]

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1answer
46 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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1answer
80 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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1answer
73 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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2answers
71 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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1answer
58 views

Red colour of the Great Red Spot

In Wikipedia it is mentioned: "It is not known exactly what causes the Great Red Spot's reddish color. Hypotheses supported by laboratory experiments suppose that the color may be caused by ...
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1answer
47 views

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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0answers
16 views

Why does Magnesium burn hotter than other Group 2 elements?

It seems apparent, when one performs the standard "flame tests" in a lab, for the Group II elements that Magnesium burns by far the hottest and brightest. Why is this true? I wouldn't expect this at ...
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0answers
11 views

Viscosity table or diagram for melts of oxides

Is there a table or diagram to relatively determine which oxides have low 'melt-viscosity' (i.e relatively flow readily when melted)? Is it possible to determine such property based on phase diagrams ...
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0answers
14 views

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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0answers
65 views

Direction of the permanent dipole moment of the NH$_3$ molecule

What is the direction of dipole moment in a molecule of $\rm NH_3$? Is from hydrogen to nitrogen? Also do we take into account the dipole moment of the lone pair with hydrogen? When we must take into ...
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0answers
17 views

Bond Type in Orthophosphate

How can we find out the bond nature in LiBaPO4 by using charge transfer values obtained through DFT calculations?
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4answers
58 views

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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1answer
68 views

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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2answers
87 views

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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2answers
142 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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0answers
43 views

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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1answer
79 views

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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0answers
156 views

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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2answers
149 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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1answer
129 views

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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1answer
339 views

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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1answer
72 views

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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1answer
2k views

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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1answer
122 views

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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0answers
35 views

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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1answer
92 views

Pressurizing with nitrogen vs vacuum? [closed]

pressurizing with vacuum causes volatilization of liquid.
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1answer
37 views

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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1answer
360 views

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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1answer
98 views

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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1answer
540 views

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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0answers
42 views

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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1answer
48 views

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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2answers
97 views

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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1answer
227 views

How can I convert mass percentage to atomic percentage?

How can I convert mass percentage to atomic percentage? I have EDX (energy dispersive X-ray) analysis for a thin film, the results are in ms% (mass percentage), how can I convert mass percentage to ...
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1answer
57 views

Can you Split $\rm CO_2$ using Microwave Heat?

I'm a layman, so maybe I didn't put the right searches in google to find the answer, but - If you microwave $\rm CO_2$ (Carbon Dioxide) to a sufficient temperature then can you split it to $\rm C$ ...
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1answer
166 views

What is the physics of the Borax method?

One can add borax to a gold sand then heat it up until it melts and then just let it cool to grab the pure gold. This is just strange. How is borax lower the melting point of something it only touches ...
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1answer
222 views

Is the bond order in a resonance situation an average or can half bonds exist?

When drawing the lewis dot structure for $NO_2^-$ There is one double bond and one single bond so the molecule exhibits resonance and has bond order of 1.5. Does this mean the molecule shares 0.5 ...
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2answers
320 views

Why exactly does molten NaCl explode, when it is poured into water?

Why does molten sodium chloride explode, when it is poured into water? $\mathrm{NaCl}$ has high melting point, $1074\,\rm K$ ($801\,\rm^\circ C$). $\mathrm{NaCl}$ has molar mass $58.44\,\rm g/mol$, ...
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2answers
82 views

What causes anything to smell?

We all know that we can see anything because of Light Absorption and all. We can hear things because of caused vibrations. But what makes an object smell? I read somewhere about the presence of ...
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1answer
29 views

C60 Macro Ojects

What would happen if you could make a ball or hollowed geometric shaped say the size of a basketball made out of C60.. due to its superconductivity could it have exotic or anti- effects on gravity and ...
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1answer
81 views

Why do bonds with positive and negative charges not collapse?

I previously believed that the reason positive and negative charges don't constantly attract until they collapse is due to a repulsive strong force at small distances. However, in a textbook by Tipler,...
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1answer
836 views

How is work function related to oxidation?

Low work function metals, such as Li and K, oxidize in ambient conditions, whereas high work function metals such as Au do not oxidize. In chemistry there's activation energy and reaction rate ...
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2answers
495 views

Is it possible to mix a luminescent drink? [closed]

Is it possible to create a drink that glows? In other words, is it possible to create a non-poisonous drink that fluoresces? Are there known compounds suitable for that? If not, then what about a ...
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1answer
2k views

A “bump” in the cooling curve of naphthalene? [closed]

While doing an experiment, I noticed a slight bump in the cooling curve. I have searched for it on the internet and all of the articles say that it is something related to super-cooling. The graph's ...
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0answers
105 views

Effects of light wavelength on the Hamiltonian of the FMO complex

Recently, I have been interested in the energy transfer within the FMO complex. I was wondering, how could the wavelength of the light that excites the complex affect the energy transfer efficiency. ...
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0answers
139 views

Alternative to Naphthalene Sublimation

I work in a wind tunnel that uses Naphthalene for flow visualization. Specifically we use it to see the location of transition from laminar to turbulent flow. We mix it with acetone and spray it on ...
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1answer
3k views

Does plasma has any chemical formula?

As far as I understand, plasma is another stage of matter like solid, liquid or gas. All of these have chemical formulas, however does plasma has chemical formula as well? If it doesn't, what's made ...
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0answers
252 views

Is there any material that a magnetic field cannot penetrate? [duplicate]

Is there any way to build an enclosure that protects its contents from magnetic fields more effectively than simply keeping sources of magnetic fields away by the same distance the box would?
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1answer
173 views

Molecular simulation applied to astrobiology

There is some research group which use molecular dynamics simulations to study the origin of life according to the hypothesis of abiogenesis? I'm just beginning to know this subject so I don't know ...
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3answers
7k views

Why does a pitcher with lemon juice have foam, while one with pure water does not?

Whenever I pour water into lemon juice (pouring directly from the tap into the pitcher, not quietly along its edge) I get a foam on top: The same pitcher with water (same water tap, pitcher, time ...