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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26 views

Passivation of metals in acids

It is commonly taught in chemistry textbooks that metals such as $\ce{Fe, Al, Cr}$ is "passivated" in cold concentrated $\ce{H2SO4}$ and $\ce{HNO3}$ due to them forming oxide films on the ...
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How can the difference between surface energy and electrostatic repulsion be calculated in electroplating?

When metals are electroplated unto surfaces, there are a myriad of forces at play. To set a clear example, if one were to electroplate a magnet with a diamagnetic metal such as bismuth, there will be ...
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Are positively charged metals structurally weaker than neutral metals? [closed]

Metals are held together by metallic bonds, which are explained by the electrostatic forces between the respective metal ions and free valence electrons throughout the metal. This explains how chunks ...
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1answer
54 views

What is the alloying composition of the Zinc-Platinum System?

My research team and I are working on a bimetallic alloy consisting of Zinc and Platinum. We have looked for papers regarding the composition of Zinc-Platinum alloy. But there aren't many papers out ...
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1answer
142 views

Boiling sodium hydroxide in stainless steel cup: Solution turning to a blue color

I boiled highly concentrated sodium hydroxide in a stainless steel cup. This created a blackish layer on the bottom of the cup and turned the colour of the sodium hydroxide solution to blueish. Am I ...
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1answer
2k views

Why do only some metals make protective oxide layers?

Almost all Alkali metals and Alkaline Earth metals react with air to form their respective oxides, but why does only Magnesium forms a protective oxide layer? What properties of magnesium oxide allow ...
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39 views

Avoiding chemical reactions with carbonated alcoholic drinks

I'm making a cooling beverage dispenser for carbonated drinks. The keg remains room temperature and the beverage rises through a pipe that's coiled up inside a cooling unit filled with water or ...
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1answer
38 views

What happens to vaporized metal in the atmosphere when it cools down? [closed]

Imagine you vaporize a chunk of metal like an iron meteorite or plutonium or whatever in the atmosphere. What happens to that metal when it cools down? Does it form dust and drop in the nearby ...
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Will a titanium piercing tarnish if submerged in sulfur water (hot spring)?

I have tried to research whether titanium piercings will tarnish if one submerges in sulfur hot springs. Will titanium piercings react to the sulfur water?
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How can I wet etch Nickel Chloride (NiCl/NiCl2) off a GaN sample

Apologies in advance for what may be a basic chemistry question - I'm asking from the point of view of microlithography. I have a Gallium Nitride sample which I have etched in a Ar/Cl plasma with a ...
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1answer
166 views

Why does the cathode in an OLED require a low work function and the anode require a high work function?

I am currently doing some research on organic light emitting diodes and am just trying to get my head around some of the terminology and concepts because I am more from the organic chemistry side don'...
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Standard practice for keeping salts dry

I should point out first that I'm not a chemist, but I'm currently doing a little bit of chemistry; this should clarify that I don't have formal training in a chemistry lab (other than some basic chem ...
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342 views

How to refine manganese metal from manganese(IV) oxide found in batteries? [closed]

I opened up some lantern batteries, and inside there's $\ce{MnO2}$ powder, carbon rods, and zinc casings, and other stuff that I don't know what it is exactly. I scraped out $\ce{MnO2}$-containing ...
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1answer
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Thinking of reducing aluminum hydroxide with magnesium

Is it possible to reduce aluminum hydroxide to aluminum metal by using a sacrificial magnesium electrode in a single displacement reaction? I checked my revision of redox charts and it looks like it ...
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Wittig reagent with metal–oxo bonds

Could you use the Wittig reagent to attack a metal–oxo bond and replace the oxygen with a carbene? Specifically, is it possible for the Wittig reagent to do σ-bond metathesis with an electrophilic ...
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1answer
42 views

When Iron reacts with any other species, how will we know that the reaction will be of Fe(II) or Fe(III) i.e. of ferrous or ferric? [closed]

Like when iron reacts with water there forms iron oxide and hydrogen but how'll we come to know which of three equation will be right equation for reaction? $$\ce{Fe + H2O → FeO + H2}$$ $$\ce{2Fe + ...
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1answer
227 views

What is this white layer on brass?

I have an object made of what I assume to be brass, i.e. an alloy of copper and zinc. The curved parts have both a black layer and a white layer (also note the verdigris (I guess) on the left top, but ...
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1answer
32 views

How can I mask the Chromium (III) and Chromium (VI) ions in my solution?

I want to conduct a quantitative analysis on my acid etching solution for my Aluminum pre-treatment process. The easiest way for me to conduct my quantitative analysis of Al is through complexometric ...
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96 views

Are Alloy Compositions Given in Weight Percent or Atom Percent

Often times I see alloys described like this, Lockalloy is an alloy that consists of 62% beryllium and 38% aluminum Are the precentages mentioned here in weight percent or atom percent? Is there a ...
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1answer
244 views

Why is RO water more corrosive?

According to several articles from the American Water Works Association, permeate from RO should be stabilized in terms of pH and hardness to avoid corrosion of the distribution piping. How does ...
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30 views

What fluid can I store metal filings in so they do not oxidize?

I am working on an art project that will involve storing filings of various metals (e.g., iron, copper, zinc) in a colorless fluid. I want to prevent the metals from oxidizing for several years, so ...
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1answer
56 views

Bonding in d10 metals such as Zn

I recently learned about the MO bonding model in metals, where many metal atoms form lots of orbitals close in energy that form bands. However, I can't understand the bonding in d10 metals. It seems ...
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3answers
161 views

Rusting in every other bar

I have noticed that, when a structure with bars (such as a gate or a grate) develops rust, this sometimes happens differently across the bars. In particular, it seems that the bars are alternatively ...
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1answer
252 views

What's the difference between Zinc Ascorbate and Zinc Gluconate?

I've been looking at a dental product for pets, called MAXI/GUARD Oral Cleansing Gel and it states it uses zinc ascorbate/taurine, however in the ingredients I found elsewhere it instead lists zinc ...
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Create metallic nanstructure on aluminum or copper film

I want to etch Al/Cu film (0.05 mm thick) to create nanopatterns on to the surface of the film. The etched surface should be metallic. The idea is to develop a simple tribolectric nanogenerator with ...
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75 views

Why is aluminum oxide resistant to corrosion?

It is common knowledge that aluminum is relatively resistant to corrosion due to its tough oxide layer. The ultrathin (1 nm even) layer is impervious to water and oxygen. What I can't figure out is, ...
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1answer
65 views

Should equiatomic iron–cobalt alloy be written as FeCo or CoFe?

I have an alloy made of 50% iron and 50% cobalt. I see occasionally in the literature this is written as FeCo alloy. But shouldn't it be CoFe alloy since the chemical symbols are supposed to be ...
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1answer
81 views

Does zinc react with nitrogen? [closed]

Does zinc react with nitrogen ? Is this reaction possible: 3Zn + N2 → Zn3N2 Or maybe there are another reaction?
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1answer
40 views

Aluminum powder from aluminum sulfate?

I recently did the experiment where you drop a piece of iron in an aqueous solution of copper sulfate. After a while, the piece of iron gets coated with a fluffy coating of copper that can be dried ...
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1answer
28 views

Is Cu stable as Cu(H2O)2+ for determination on MP-AES? [closed]

I have an unknown sample of mineral which I need to dissolve in nitric acid. I need to analyze $\ce{Cu}$ from it on MP-AES. Do I need to add $\pu{1ml}$ of $\ce{HCl}$ to stabilize $\ce{Cu}$, or it is ...
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1answer
36 views

What are coexistent metals?

In ACS Sustainable Chem. Eng. 2018, 6 (10), 12542–12561, I saw the term "coexistent metals", but I could not find a definition for that on the Internet. So what does it mean? Karapinar et ...
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2answers
56 views

rust caused by salt solution & stainless steel

I am not a chemist and I could really use some help for a practical case. I am fermenting vegetables (cabbage, onions, carrots, etc.). I recently switched from glass and ceramic vessels to stainless ...
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1answer
85 views

Can a metallic bond with a sea of electrons form inside the human body? [closed]

I’m interested if atoms or ions can for a metallic bond inside the human body? I’m talking about a metallic bond as described here: https://www.britannica.com/science/metallic-bond So I’m thinking of ...
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1answer
108 views

Is it possible for already charged metal ions to form a metallic bond? [closed]

I would like to know if it is possible for already charged metal ions to become part of a metallic bond. I was thinking of a possible metallic bond formation with other already charged metal ions or a ...
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1answer
130 views

In metallic bonding, what causes a metal to lose its outer electrons and become an ion? [duplicate]

In metallic bonding, what causes a metal to lose its outer electrons and become an ion? I am trying to understand metallic bonding, atoms and ions.
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1answer
99 views

Why aren't solid pure transition metals colourful?

I understand that the compounds of transition metal are colourful because of the appropriate energy gap between different d orbitals. But why aren't they also colourful in their solid pure state? For ...
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36 views

Zinc salt with a very high relative aqueous solubility?

Zinc bromide, iodide, and chloride are highly soluble in water, both in absolute terms, and relative to other metals. I think however that there is a zinc compound with even higher relative aqueous ...
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70 views

Why is gold even golden? [duplicate]

Bulk gold has a very characteristic warm yellow shine to it, whereas almost all other metals have a grey or silvery color. Where does this come from? I have heard that this property arises from ...
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1answer
58 views

What is the influence of glass type on silver mirror making?

I'm considering the reaction wherein ionic silver (from the dissolved nitrate) is reduced by glucose in the presence of NaOH and forms a metalic silver layer on glass. Reading through several topics ...
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42 views

In Na extraction, is Ca2+ of CaCl2 reduced in addition to Na+ of NaCl in electrolysis

In Na extraction from $\ce{NaCl}$, $\ce{CaCl2}$ is added in electrolysis to lower the melting point of the mixture to about $\pu{750 ^\circ C}$. But doesn't $\ce{Ca^2+}$ cation compete with the $\ce{...
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1answer
326 views

Do we have some “rule of thumb” to estimate the miscibility of metals?

For example, for ordinary fluids, we have polar and apolar ones. The "rule of thumb" is that polar fluids mix with each other, and also apolar fluids mix with each other, but polar fluids ...
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1answer
882 views

Does there exist a black coloured metal?

Most of the metals are just painted/coated black. Does there exist a black coloured metal, either natural or artificial, such that even when we scratch it, it will still remain black?
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1answer
52 views

Is it possible to manipulate some specific atoms of a liquid metal by dint of the magnetic field, electric field, etc?

Let's deem, we have a liquid metal that is multicomponent, for example, type A, B, and C. Is it possible that we single out the type A and put them in a specific shape, for example, a circle? Let me ...
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3answers
4k views

How toxic chemically is plutonium (Pu), neglecting the radioactive damage?

In Rhodes' The Making of the Atomic Bomb, he says that, while Pu is not that radioactive (which is surprising -- maybe he means compared with radium and some other elements), it is very toxic. I would ...
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Can metal matrix composites be alloyed after their creation?

I've done a little research on metal matrix composites (MMCs), purely for fun and out of interest. Different types of metal powders are combined with reinforcement materials, to produce a reinforced ...
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0answers
412 views

Will a dangerous amount of lead leach into soil from a galvanised corrugated steel raised bed? [closed]

I have searched, found similar questions but none answer my specific need. I have built a raised garden bed to grow vegetables (ironically due to a high lead content in our garden soil - planning to ...
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2answers
40 views

If acid releases proton then how can a proton react with another proton to form hydrogen gas? [duplicate]

As we know that acid releases proton (H+ ion) when dipped in water hydrogen has a proton and electron only . To form H+ hydrogen releases 1 electron and it becomes proton. But when Acid reacts with ...
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1answer
83 views

The dissociation of hydrogen on UO2 and PuO2 surfaces: Homolytic or heterolytic?

I have seen that $\ce{H2}$ can dissociate on a metal-oxide surface by two methods: Heterolytically, forming a proton-$\ce{O}$ bond ($\ce{OH}$ group) and a hydride-metal bond ($\ce{M-H}$) on a metal-...
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2answers
539 views

Why is Na+ reduced instead of H+ in the electrolysis of dilute NaCl(aq) with Mercury cathode?

In a class of electrolysis, my instructor told me that Hg forms Na-Hg in the electrolysis of dilute NaCl aqueous solution. For this reason, sodium cations are reduced in the cathode instead of ...
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41 views

Do all metals expand on heating? [duplicate]

This question came up when I was reading about substances with negative thermal expansion. The article by Takenaka [1] gives a good list of materials displaying negative thermal expansion. I noticed ...

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