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Questions tagged [metal]

For questions about metals in general and their physical or chemical properties. For characteristic properties and reactions of d and f block metals specifically, use the [transition-metals] and [rare-earth-elements] tags respectively instead.

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Which alloy forms the thinnest sulfide surface passivation layer?

Metal sulfides seem to often form thick layers on alloy surfaces exposed to molten $\ce{S}$. Are there alloy surfaces capable of passivation with $\ce{S}$ before the layer thickness reaches $\pu{1 nm}$...
2 votes
1 answer
153 views
+50

Metallic nanostructures exhibiting charge separation

Mostly ions consist of a few atoms. It is easy to see, why the solids they form must have simple stoichiometries. It is true even for polymeric ions, such as some complicated organic molecular ions as ...
11 votes
0 answers
89 views

Is gallium slippery at room temperature in an inert atmosphere?

Ice is slippery when it isn't too far below it's melting point because the surface molecules are less loosely bound than the bulk and form a thin liquid layer. Pressure melting is a much smaller ...
5 votes
1 answer
64 views

How to make a thin layer of crystalline barium titanate on copper substrate?

Is it possible to create a thin $\ce{BaTiO3}$ crystal layer on a copper plate by putting the plate in a beaker, pouring in heated hydrofluoric acid that has been saturated with $\ce{BaTiO3}$ powder ...
14 votes
3 answers
1k views

Is anything other than metals soluble in molten metals/alloys?

The question stems from my search on staining metals; in particular I commonly encountered "Can you dye a molten metal" questions, with the usual, simple answer of "any pigment will ...
5 votes
0 answers
67 views

Is there such thing as metallic helium?

I know that hydrogen can behave as a conductor under high pressure (metallic hydrogen); however could helium behave similarly under high pressure? If so, could this have any potential benefits over ...
0 votes
0 answers
17 views

Binding energies of transition metals in the 3d series

Binding energy of the transition elements in the 3d series increases up to vanadium then drops from chromium to manganese and then increases slightly and then drops again It is seen that binding ...
2 votes
1 answer
1k views

Are alloy compositions given in weight percent or atomic percent

Often I see alloys described like this, Lockalloy is an alloy that consists of 62% beryllium and 38% aluminum Are the percentages mentioned here a weight percent (wt.%) or atomic percent (at.%)? Is ...
12 votes
1 answer
296 views

What is this golden looking substance?

I am currently messing around with gallium compromising aluminum. I am using a titalium lock which is just a brand of aluminum padlock and I put a gallium-indium euctic alloy on the surface of it. It’...
3 votes
0 answers
31 views

Thermostability of Metal Carbonates and Nitrates

While studying in high school, I came across the following thermal decomposition reactions: $$\ce{Li2CO3 -> Li2O + CO2 }$$ $$\ce{MgCO3 -> MgO + CO2}$$ $$\ce{PbCO3 -> PbO + CO2}$$ $$\ce{Ag2CO3 ...
2 votes
2 answers
117 views

Does the electric field of a battery exist before a wire is connected outside?

Imagine a galavanic cell. What I am wondering is, what causes the inital oxidation of the less nobel metal to occur initally. Is the electric field there before you connect a wire, which would allow ...
13 votes
3 answers
2k views

Do electrons really hang around the electrode while ions go take a swim?

This answer to this post addresses "what happens if you dip a single zinc electrode into some electrolyte solution." It explains that However, though the zinc ion can diffuse through the ...
10 votes
1 answer
351 views

What are metal zip tags and belt buckles made of?

Metal zipper tags and belt buckles melt very easily and can be melted by heating it in the stove for 5 minutes. But other metals like aluminium refuse to melt even after hours. If you leave it ...
7 votes
1 answer
524 views

Buildup of white powder where metal has been touching a salt stone

The other day, I opened a box for my cellar I use to store random junk and found this: The pink stone is a salt stone from a pet store. I assume it's NaCl with impurities. The ring is some metal ...
31 votes
3 answers
35k views

Why does the 3rd electron shell start filling up with scandium?

The electron configuration of calcium is 2, 8, 8, 2, where up to that point each shell, asides from the first shell counts up to 8 - why then does scandium have an electron configuration of 2, 8, 9, 2?...
240 votes
1 answer
73k views

Why can we smell copper?

If I can smell an object, it means that molecules of it are getting separated from it, so they can reach my nose. As far as I know, metals don't sublimate, especially not in room temperature. However, ...
0 votes
0 answers
34 views

How to coat stainless steel?

I am trying to coat stainless steel with carbon black. I am using Polyvinylidene fluoride PVDF 2% as a binder. I dip and I heat at 100C. The coating that comes out is very fragile where you can blow ...
23 votes
2 answers
1k views

Why are lithides not known?

In the last few decades, many alkalides - anions of alkali metals - have been synthesised. The most famous is undoubtedly that of sodium: $\ce{[Na(\text{2.2.2-cryptand})]+Na-}$, but the alkalides $\ce{...
14 votes
4 answers
3k views

Does molten metal liquid chromatography exist?

Liquid chromatography is used to analyze and purify different chemical samples in a solvent. It is also used for industrial scale chemical purification. I was wondering if something similar exists for ...
4 votes
1 answer
319 views

Nephelauxetic effect and covalency of metal-ligand bonds

As I was reading about nephelauxetic effects, which is the effect that atomic d-orbitals are bigger in a complex than in gaseous metal ions. The Racah interelectronic repulsion parameter gets smaller, ...
11 votes
1 answer
13k views

At what temperature does charcoal burn?

According to an old Wikipedia revision, charcoal burns at temperatures as high as 2600 °C. Other sources which seem less reliable give a figure of around 1000 °C. The Wikipedia article has since been ...
7 votes
0 answers
133 views

Metal hydrolysis and equilbrium constants from stability constants

Problem: I want to create minimum solubility plots for a series of metal hydrolysis species against pH (below). But I cannot reconcile literature stability constants and equilibrium constants. Context:...
0 votes
0 answers
46 views

Cleaning Cobalt with Dodecylbenzene Sulphonic Acid

Here in Brazil we use a special detergent to clean up metals, based on Dodecylbenzene Sulphonic Acid, it is very effective at shining up all sorts of different metals. I recently acquired 2 samples of ...
9 votes
2 answers
4k views

Have we ever created artificial metals?

I really don't know anything about chemistry, but I was wondering about the following vague question: has any substance been created that does not contain any metallic elements, but is metallic? In ...
17 votes
3 answers
5k views

Disproportionation of Au(II)

$\ce{Cu(II)}$ and $\ce{Ag(II)}$ complexes are known to exist while $\ce{Au(II)}$ is unstable and disproportionates to $\ce{Au(I)}$ and $\ce{Au(III)}$. My guess as to possible reasons to this effect ...
6 votes
1 answer
1k views

Why do some elements with high electronegativity exhibit metallic properties?

Metals typically have low electronegativity, which makes them form ions easily and prefer making metallic bonds to covalent. However, some of them seem to disprove that. Take, for example, gold, lead ...
2 votes
2 answers
15k views

Separate precious metals from catalytic converter

I am looking to separate the small quantities of platinum and palladium in a catalytic converter. However since these are very inert metals I am unsure how to proceed about doing so. Melting the ...
1 vote
0 answers
31 views

Unusual Inconsistencies in Gibbs Free Energy Values at Specific Temperatures in Thermodynamic Simulation

I was using FactSageEdu software to simulate a metal with a composition of 67% titanium (Ti) and 33% aluminum (Al). During the simulation, I encountered an inconsistency in the calculated Gibbs free ...
6 votes
3 answers
2k views

Why are there so many metals in the periodic table?

Brief Background: I was studying about the 'classical electronic configuration' of the first 20 elements of the periodic table today and was bewildered by the fact that there are an equal number of ...
4 votes
1 answer
209 views

Why does cold welding not work with carbon steels?

Cold welding is the process of joining metals using pristine surfaces without contaminents(oxide layers, oil, dust...) using pressure through atomic diffusion between the metal joints. Why does this ...
3 votes
1 answer
2k views

I heard aluminium doesn't produce fumes when burnt but the opposite happened, how?

One day I took aluminium foil(sanitary brand, don't know if you've heard it) then I casually burned it over a gas lighter then it burned and gave off Grey fumes and the foil became a dull Grey ...
5 votes
1 answer
317 views

Can a colorant be mixed into zirconia powder?

I’m wanting to color zirconium dioxide into beads after it is fired but I would like to get more colors than just white and the high temperature black oxide. Can I mix other metal oxides to zirconium ...
12 votes
3 answers
2k views

How can steel be so different from iron, even if amount of carbon is small?

Perhaps I am too naive, but I am having a hard time visualizing how even 'high-carbon' iron and steel alloys are maybe, at most, about four percent carbon by mass, which still means only one (smaller) ...
17 votes
2 answers
10k views

Gaseous metals?

Metals form metallic bonds which explain many of their chemical and physical properties. This is most familiar in the solid state but metallic properties are still quite recognizable in the liquid ...
3 votes
1 answer
87 views

Can Silicon hinder the precipitation of AgCl?

In my lab, I am having trouble with getting correct silver percentages. For example, let's say a 99.99% silver sample. Digested in 10 mL of a 30% HNO3, fill up to 100 mL with DI, then concentrated (...
12 votes
3 answers
7k views

Alloys for inkless metal pen

What alloys can be used to make a metal pencil like this one?
1 vote
1 answer
570 views

Does the distance between the atoms and arrangement of a crystal affect malleability?

I'm designing an aircraft, and certain sections need to hold under a lot of stress. I know that it is the ways the metal crystallizes that effects the malleability, but does the distance between the ...
-2 votes
1 answer
77 views

Perfect amount of HCl to precipitate 1.000g of silver alloy

I am trying to figure out the perfect amount of HCl to drop silver out of a solution for a specific alloy. This alloy is 79.5% - 80.25 % Ag. We digest this (size of the sample is usually 1.000g or 0....
0 votes
0 answers
24 views

will adding metal nano particles to a CNT-polymer matrix increase the conductivity of the polymer?

I was wondering would just physical mixing of metal nano powders with MWCNT in a polymer matrix improve the conductivity of the said polymer? Would the metal particles interact with the CNT network. I ...
2 votes
0 answers
28 views

Conductive ink on silicon to bridge two isolated regions of the wafer

Can I use a thin layer of conductive ink on silicon to bridge two isolated regions of the wafer (p-type)? I know that using PVD methods would be the best option, but I don't have access to these ...
-2 votes
2 answers
288 views

How to neutralize 60L of a 2% Aqua Regia with Various Metals suspended

I am encountering an issue in my laboratory. My supervisor and I are currently faced with the task of neutralizing a volume of 60 liters of Aqua Regia, which contains suspended metals, at a ...
5 votes
1 answer
632 views

Why I am unable to see any electrical conductivity in Permalloy nano powders?

We recently purchased some permalloy nano powders (Ni80Fe70Mo3) I checked the electrical conductivity of these powders using a multimeter which can measure resistance to the order of giga ohm's. I was ...
4 votes
1 answer
11k views

What's the simplest way to etch Nickel and Chromium sputtered layers?

I have to etch a very thin film (50 nm) of Nickel ($\ce{Ni}$) on a 100 nm $\ce{SiO2}$/$\ce{Si}$ substrate. Additionally, there is a ~5 nm adhesion layer of $\ce{Cr}$ under the $\ce{Ni}$ that I'd also ...
0 votes
1 answer
79 views

Malleability and Ductility Origins [closed]

Malleability and Ductility are both properties of metals. I have learnt that lead is malleable but not ductile. However, don't these properties both arise from metallic bonds? So how can a substance ...
-4 votes
1 answer
84 views

What is produced from chromium, HCL and NH3

I wanted to see if I could get a chromium salt from stainless steel, so I put the stainless steel in HCL, turning the liquid green. Then I mixed the result with ammonia, and a green solid precipitated ...
-1 votes
1 answer
329 views

Is water required for metal to rust, or is only oxygen necessary? [duplicate]

What causes rusting? Some sources say ferrous metals don't rust without being exposed to humidity or water, whole others say they do rust as long as there is oxygen present, just more slowly. Which is ...
1 vote
0 answers
59 views

Does anybody know anything about this patented, late-19th-century process for producing white lead?

I debated on whether to put this question in the History or Engineering Stack Exchange. Ultimately, I decided on the Engineering Stack because I believe the people on this site will understand the ...
1 vote
1 answer
82 views

What household objects are made of metals with a high degree of purity?

I've looked into this briefly and from what I've understood, the kind of copper that's used to make electric copper wire is generally of a high purity (well above 99%). What are some other household ...
1 vote
1 answer
52 views

what are other metal oxide that can be used as electron acceptors?

I am using silver oxide as a cathode because it's common. I was reading that " some solid metal oxides (e.g., silver oxide, lead dioxide, and manganese dioxide) possess high redox potentials. ...
2 votes
1 answer
3k views

Trends in conductivity in groups 1 and 2

I have read that the trend for conductivity in groups 1 and 2 is a decrease down the groups (generally). Apparently this is because the atoms of each element get larger, so while the number of ...

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