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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1answer
96 views

Are there non-brittle silicon-based alloys? [closed]

Requirements: Silicon part is greater than 50% Has plasticity comparable to iron.
2
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1answer
115 views

Does a red hot metal reflect light in the same way as a cold metal?

I know that a metal at room temperature looks shiny because of the free electrons on the surface, but what about a hot red metal? Would it also reflect light in the same way as it does at a colder ...
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1answer
412 views

Are bones generally harder to corrode than human skin?

I am making a fantasy universe and really I am also curious to know if bones generally are harder to corrode than human skin in our world and at what rate? I was thinking to compare how a skeleton ...
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3answers
308 views

Why does Li get darker in a glove box?

I'm having some issues with lithium getting darker in a glove box. Please see attached photos, Li gets dark overnight. My sensors for $\ce{H2O}$ and $\ce{O2}$ are showing 0 ppm. I also checked oxygen ...
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0answers
302 views

Why does zinc turn dark?

So I casted a zinc ingot around a week ago and I also casted 2 zinc ingots yesterday. After observing the two side by side I noticed that the older zinc ingot was darker colored, then I went and ...
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3answers
5k views

How do you melt magnesium without causing its combustion?

How do you melt magnesium without causing its combustion? I own a foundry capable of reaching temperatures around 2000 °F, and I recently bought some magnesium for melting before doing my ...
21
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2answers
687 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{...
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1answer
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Why do metals appear lustrous?

I came across a question asking me the reason for the lustrous appearance of many metals. The answer stated that it was due to the presence of free electrons in the metal. But I don't understand how ...
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1answer
2k views

Is chromium the shiniest metal?

I have seen many pictures of chromium, and it's pretty lustrous as I must say. Here are some examples. Is it the most lustrous metal known? Edit: By lustre, I mean suppose if we have a mirror ...
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0answers
74 views

Molar ratio of two oxides of the same metal

A certain "metal oxide" is made of the oxides $A$ and $B$ of the same metal. In the oxide $A$, the metal is divalent, and in B, the metal is tetravalent. By reduction with hydrogen of a quantity $a$ ...
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1answer
211 views

Oxide and chloride of a metal [closed]

I found this problem: The oxide of a metal contains 60.0% metal and the chloride of the same metal contains 25.26% metal (in mass percents). What are the possible formulas for the oxide and the ...
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1answer
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What is happening in this video of solvated electrons donated from sodium in ammonia?

I just saw the Periodic Video Liquid Electrons - Periodic Table of Videos where sodium is added to liquid ammonia. The demonstration shows that even if electrons are solvated, if you have a high ...
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0answers
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Why do heavy metals like mercury and lead have an affinity for sulfur or sulfur compounds?

Many of the heavy metals such as mercury, lead, thallium, cadmium, and arsenic exert toxic effects largely by binding to or otherwise interfering with organic sulfur compounds or groups in the body. ...
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1answer
479 views

Why does Fluorine have a high affinity for Calcium?

I keep hearing from several websites and videos that Fluorine seems to like bonding to Calcium specifically; can someone please tell me why? I can't seem to find a clear response on the internet. ...
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1answer
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Why do Ca-Ca distances get shorter in ionic structures, as compared to the metal?

I saw in the book Chemistry of the Elements by Greenwood & Earnshaw, 2nd ed., p 66, that the distance between calcium atoms decrease when it's forming an ionic structure. The closest $\ce{M-M}$ ...
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0answers
167 views

Very fast brass oxidation

I work for a company that manufactures pyrotechnics for the oil and gas industry, and we have been having an odd phenomenon occur. One part, a brass tube with a copper clip filled with black powder, ...
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1answer
3k views

Bubble formation when aluminium reacts with copper(II) sulfate solution

I recently did an experiment putting pieces of $\ce{Al}$ and $\ce{Fe}$ into copper(II) sulfate solution and I noticed when the piece of aluminium was reacting, tiny bubbles were coming out whereas ...
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3answers
820 views

What metal is this?

Does anyone know what metal this is? (right click -> "Open image in new tab" for larger image) It has to be one of the following: magnesium, aluminum, zinc, tin, antimony, lead. This metal was found ...
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0answers
546 views

Does iron in water become visible when being heated?

I'm using ground water to provide my daily needs: Laundry, bath, toilet, ... I don't use it as drinking water, but I do cook with it. What I noticed is that when using the water cold it appears as ...
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3answers
16k views

How does density of alkali metals increase down the group?

Size of alkali metals increases down the group, so volume also shows increment, and since volume is inversely proportional to density, how does density also increase down the group?
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2answers
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Why should fire extinguishers containing carbon dioxide not be used on magnesium fires?

As the title states, why should $\ce{CO2}$ fire extinguishers containing carbon dioxide not be used on fires with magnesium metal? I understand that $\ce{CO2}$ extinguishers work by displacing oxygen,...
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1answer
186 views

What materials for a boiler, if any, do not require a deaerator?

I'm imagining a portable boiler/turbine unit that burns wood and creates steam for a turbine, generating electricity. I was planning on using freshwater from a river or lake. (A simple filter will ...
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0answers
73 views

POMs catalysis of benzyl alcohol oxidation, why Ni is the best cation with POM for that catalysis?

Why is nickel the optimal cation for benzyl alcohol oxidation with POMs and hydrogen peroxide? In this article (Chinese Journal of Chemistry, Volume 30, Issue 2, 2012), they came to a conclusion that ...
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0answers
342 views

Why is polyacetylene an insulator?

Recently I have studied Huckel-theory and I appreciated how this approach is suitable to provide simple models to understand chemical behaviour. However, it is highly approximate and qualitative at ...
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1answer
40 views

Cell walls in lath martensite - Meaning

What does cell walls mean in the context of lath martensite? Are they grain boundaries? Quote (page 66 Structure and properties of engineering alloys - Smith): In the lath martensite of low-carbon ...
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1answer
165 views

Bainite at room temperature?

I read that if, after a tempering from T>723°C to T*=[250°C,550°C], I do an isothermal transformation of an eutectoid steel, I'll get bainitic microstructure. Does this microstructure exist only if ...
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1answer
1k views

Why doesn't Sodium (Na) form duplet?

The atomic number of Na is 11 (2, 8, 1). Na loses an electron to achieve octet stability but why can't it just accept an electron to complete duplet stability?
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1answer
120 views

Diffusion of carbon from ferrite to cementite in the eutectoid transformation

Why does the carbon of an alloy diffuse from ferrite (0.022% C) to cementite (6.70% C) during eutectoid transformations? I know that the diffusion of a generic species (e.g. of atom A) carries A from ...
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1answer
5k views

Why does the nature and oxidation state of a central metal affect field split?

I know the following factors affect the value of field splitting in a coordination compound: No. of ligands surrounding the central atom. Strength of the ligand (as per spectrochemical series) Nature ...
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1answer
479 views

Is ruthenium really invulnerable to aqua regia?

Recently, I answered a question "What metals aren't dissolved in/attacked by aqua regia?" in which I finally concluded "ruthenium is resistant to aqua regia in any form at any concentration of ...
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3answers
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What metals aren't dissolved in/attacked by aqua regia?

Aqua regia (Latin: Royal Water) is one of the strongest acids known in Chemistry, and is capable of dissolving gold and platinum. My copy of the Oxford science dictionary goes on to say (under the ...
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1answer
3k views

Is aluminium amphoteric?

In my book it says that aluminium can react with water as a base when it's in the form $\ce{[Al(OH)2(OH2)4]^+}$. And this way as an acid: $\ce{[Al(OH2)_6]^3+}$. So ... does it depend on with which ...
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3answers
5k views

Difference between intercalated lithium and metallic lithium (Li-ion batteries)

I have a question about Li-ion batteries. I sometimes see the two terms - intercalated lithium and metallic lithium - used when talking about this type of batteries and I was wondering what is the ...
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1answer
128 views

Corrosion of metal

Why would a metal corrode more in a lower concentration of nitric acid compared to a higher concentration sulfuric acid? Isn't sulfuric acid suppose to be a stronger acid compared to nitric acid?
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3answers
803 views

Naming ionic compounds of group B

When naming an ionic compound which includes a transition metal, the oxidation state is written between parantheses, yet some metals show an exception. Which elements represent this exception, and ...
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1answer
355 views

How to speed up corrosion of magnesium?

For an experiment, I need a corroded magnesium, but I got fresh mill cutoffs. Is there I way to speed up the corrosion process? Actually would like to simulate a crushed magnesium rod, that spend ...
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0answers
2k views

Why magnesium has the lowest melting and boiling point in its group? [duplicate]

It is written in the third point ( shown in the picture) that presence of d orbitals results in stronger metallic bond. 1) We check the strength of metallic bonding to compare the melting and boiling ...
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0answers
140 views

Constructing a reactivity series, magnesium more reactive than sodium?

I reacted about $0.25 \,\mathrm{g}$ of magnesium, sodium and lithium in $20 \,\mathrm{ml}$ of $2 \,\mathrm{M} \,\ce{HCl}$ at room temperature. This was all done in a $100 \,\mathrm{mL}$ beaker. I ...
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2answers
285 views

possibility of metallic ammonium

In chemistry class, we discussed how metallic bonding occurs when metals lose electrons and become cations while the lose electrons become delocalized electrons and bind the metal cations. These ...
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1answer
1k views

Thermite reaction beween zinc and iron(II, III) oxide

I have zinc metal and iron oxide in the form of magnetite which I would like to obtain iron metal from. I was wondering if I could use a thermite reaction to create iron and zinc oxide? I would like ...
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4answers
262 views

Protecting elemental Li from the atmosphere

I would like to make a small decorative object out of lithium, and keep it in an ordinary household (indoors) atmosphere. The making itself aside, what can I do to protect it long-term from reacting ...
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1answer
649 views

Measuring lead content in pewter

I've bought pewter at the thrift store and I want to try casting metal. This pewter may contain toxic metals. A ready-made testing kit I've found cost €25 for each sample. In comparison pewter of ...
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1answer
2k views

How to reduce Tin Oxide

We have a pilot atomization setup where we atomize molten tin to produce tin powder. Unfortunately a lot of tin is wasted and oxidized. I have found this video on which looks promising. Is this the ...
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1answer
2k views

Comparison of alkali and alkaline earth melting points - MO theory

If you compare the melting points of alkali and alkaline earth metals, you see that the latter have higher melting points. However, if you look at MO theory, then alkaline earth metals should have ...
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2answers
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Why is bismuthine (BiH3, or bismuth trihydride) unstable if bismuth is considered to be the most stable heavy element?

Bismuth-209 is considered to be the most stable heavy element, though it is weakly radioactive. Given that, why does bismuthine ($\ce{BiH3}$, or bismuth trihydride) have a half-life of only 20 ...
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1answer
350 views

How would one make a non-toxic pen out of osmium?

Osmium is the densest element in the periodic table. However, it is toxic in its pure form. Is there a way to create a standard pen out of osmium but coat it in a dense material that isn't toxic to ...
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1answer
82 views

Feasibility of using Magnesium, Beryllium, Lithium as light sources?

First off, I'm asking this for worldbuilding purposes, so don't worry, nobody will get hurt ;) Magnesium, Beryllium and Lithium burn relatively bright. If they are somehow thinned out in some other ...
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0answers
32 views

ZnO layer as a passivity layer

I have bought a zinc sheet and with SEM I can see a ZnO layer, which is a passivity layer. But when I connect this sheet to a conductive wire, le zn sheet is conductive too. Is that normal ? the ZnO ...
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0answers
73 views

reduce size of zinc dust

I am working with zinc dust (particles of 10um). I want to make a stable dispersion of this dust with arabic gum. The problem is that the particles are still too big, the solution rapidly settles.... ...
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2answers
839 views

Metal reagent in dehalogenation of vicinal dihalides

In the dehalogenation of vicinal dihalides why can't sodium be taken as a reagent? I understand that zinc is taken because it is reactive and rate of reaction would be considerably high and it ...

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