A metal is an element, compound, or alloy that is a good conductor of both electricity and heat.

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Why do certain metals have a negative effect on bacteria? [on hold]

Is it because the metals bond to their delicate membranes, effectively suffocating them? Or are they just poisonous to them as a result of their intrinsic properties?
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protecting contact between aluminium and copper wires

The quarters in which I live has both aluminum and copper household wiring. This results in corrosion of the contacts and can lead to sparking, overheating, and even fire. Is there any way to ...
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23 views

Improving copper contact and preventing oxidation

I have a model railway in which I use pure copper on the tracks and in the engine to power the train with electricity. Is there any solution to prevent the copper surfaces from corrosion, and maybe ...
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56 views

Ag-Sn-Cu Phase diagram to formulate homogenization temperature / duration

I am working on Ag-Sn-Cu alloy phase diagram to figure out the best temperature / duration to homogenize the alloy (annealing). The %age of elements in the alloy are Ag - 40 % Cu - 27.8% Sn - 32.2 % ...
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79 views

Why is it that the least reactive metals are the best electrical conductors?

Silver, Gold and Platinum are amongst the best conductors of electricity, but also the amongst the most unreactive. Since electrical conductivity depends on the number of delocalized electrons (along ...
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48 views

Why dishwashers are corrosive to aluminum?

When I put aluminium parts into my dishwasher, they get tainted and they are sometime covered with white dots similar to salt. I don't think it is aluminium oxide. What are the chemical reactions ...
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123 views

why platinum/palladium are such a good catalyst?

Platinum and palladium are great catalysts. At the same time, other metals of the same family are not. What are the atomic level reasons for this?
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66 views

Why are noble metals more electronegative then most metals?

I was researching about electronegativity when I looked up what a graph of electronegativity within the periodic table is. And, this appeared. I scanned it, matching up everything I knew about the ...
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649 views

Is aluminium a metal or metalloid?

Aluminium is along the dark line of the Periodic Table and it is $p$-block metal. Is it metal or a metalloid? Why?
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Why does cationic charge density affect metallic bonding?

Group II metals have a smaller cationic size but one more valence electron than Group I metals. Why would the higher charge density of a metal cation affect the strength of the bonding of it in its ...
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3k views

Could milk rust a steel teaspoon?

Recently, while cleaning a neighbour's fridge (turned off for a few weeks), I came across a cup (closed with a lid). Inside the cup was, to my olfactory horror, congealed milk, with a steel (iron) ...
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30 views

Electroplating metal inside polymer foam with acetone

In my research we have a method of making polymer open-cell foams with high tortuosity and pore sizes on the order of 50–200 nanometers. I can make thicknesses of 100 µm to 2 mm thick (and up to 5 ...
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Is the pH of a solution (orange juice) affected by the presence of a metal?

Is the pH of a solution (orange juice) affected by the presence of a metal (aluminium, tin or iron for example)? I know that the metal will corrode in the presence of an acid (citric acid in this ...
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23 views

Sodium by electrolysis through glass

In his 1926 thesis Robert Cady Burts describes the production of sodium by electrolysis of sodium nitrate through glass. I can't find much else on this method. Are there any modern descriptions of ...
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55 views

Palladium Nanocube

What is the relative permittivity and relative permeability of a palladium nanocube? If I change the size of this $\ce{Pd}$ nanocube, will these values be changed or remain the same?
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59 views

I need Iron powder. What's the best way to produce it?

I have Ferric Chloride and Aluminum... I also have steel filings from grinding steel objects, though some Iron Oxide have be separated (I do have Oxalic Acid and Citric Acid). Though that would give ...
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How to detect lead paint on a bicycle?

Recently I started renovating a bicycle. The frame has been painted probably over 30 years ago, and despite holding well, big patches of rust are showing. So it's time to give the bike a new paint ...
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What does boiling point of a metal depend on, specifically manganese?

Boiling point, as I understand, generally depends on molar mass and the intermolecular interactions in the liquid phase. What are the other influencing factors? What intermolecular forces are ...
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62 views

Are there compounds that melt under their own weight?

Is there a compound that can melt under its own weight? That is, a block of such material remains solid when put horizontally but starts to melt when put vertically or remains solid in microgravity, ...
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85 views

Why does magnesium have an exceptionally low melting point?

Why does magnesium have a lower melting point than both calcium and beryllium? It does not seem to fit into the group trend.
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53 views

Corrosion of a galvanic couple made with silver and gold

If a bangle is made out of gold and silver, connected with each-other would there be corrosion happening? If so, can it be explained using the galvanic series? Also do those metals undergo oxidation ...
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353 views

Why are Group 11 elements unreactive?

Group 11 metals namely $\ce{Cu, Ag, Au}$ are known for their low reactivities. They are thus rightly called coinage metals and have been historically used to make currency owing to this very property ...
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324 views

What causes the iridescent colour in laboratory grown bismuth?

Artificially grown bismuth crystals are arguably magnificent, as seen in the image below: Image source: Minerals.net The website states that: They have hopper-like growths in pseudocubic ...
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68 views

Gallium-induced structural failure of aluminium

I have seen youtube videos of people treating some aluminium object with liquid gallium and after letting it sit for a while, they are able to break up the aluminium into tiny little pieces with their ...
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33 views

Different solder composition affects the connection strength?

I was wondering if the tin/lead/other metals bond with the metal parts that are low-temperature soldered. I know that the flux in the solder is used to remove the oxide layer, leaving a clean metal ...
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42 views

Will selenium react or bond, ionic or covalent, with vanadium?

I was recently asked if $\ce{Se}$ will bond with $\ce{V}$, creating a compound $\ce{SeV}$ . I am not sure if this is even possible but if so I'd like to find out.
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how does the “sea of electrons” hold metal atom together

how does the delocalized electron hold metal atom together? What is the forces of attraction between the atom and electron called ?
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How different concentration of HCl on magnesium affect the enthalpy change

I had conducted an experiment where I reacted a $0.3\ \mathrm{g}$ strip of magnesium with $100\ \mathrm{mL}$ of varying concentrations of $\ce{HCl}$: $1\ \mathrm{mol/L}$, $2\ \mathrm{mol/L}$ and $3\ ...
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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 ...
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112 views

Why do ion cores not move in a metal?

The delocalized electrons in a metal move about because of the electrostatic attractions between them and many different positive ion cores. But why does the same not occur with the ion cores ...
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76 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 ...
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59 views

De-ionized water [duplicate]

Is de-ionized water more corrosive to metals than tap water? I have read that it "wants" the removed ions back and will aggressively take them from any available source.
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142 views

Jahn-Teller Metal : The new state of matter

Recently it came in the news that scientists have discovered a new state of matter called Jahn-Teller metal. I tried reading up on it but couldn't understand it clearly. Please explain in simple ...
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46 views

What would a diagram of the metal lattice structure of CuSO4 look like?

Just as $\ce{NaCl}$ would look like this: What would a diagram of $\ce{CuSO4}$ look like?
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145 views

What chemical characteristics give types of steel their properties?

I am a mechanical engineer, and just like everyone else I had classes on the crystal structure of metals, phase diagrams, and the various heat treatments. However, even after diving back into that ...
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Is there a characteristic that characterizes all, and only, metals?

The Wikipedia article on metals describes them as elements whose polyatomic configurations* exhibit any one of a number of patterns. I could not discern any property that characterized all the ...
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188 views

Why is a tin can that appears like galvanised steel rusting?

I bought a canned pineapple and finished the content. The part of the can that is in contact with the liquid appears like galvanized steel (crystalline surface or spangles sort of appearance), while ...
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28 views

Determining spin of metal complex

Is there any way to determine the spin of $\ce{[Fe(OH)6]^{4-}}$ without looking at the spectrochemical series?
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In solid Iron, what is the charge of the positive atom? [duplicate]

I'm familiar with the sea model of metals. What I'm curious about is: exactly how many electrons are lost by the iron, to be absorbed into the sea of electrons? For a general metal, how many electrons ...
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81 views

Titration of C₄H₆O₂

$\ce{C4H6O2}$ (10.75 g) was dissolved in water (250 cm3) and then a 20 cm3 sample was titrated against an alkali metal hydroxide solution. This required 17.35 cm3 of the alkali. What was the ...
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162 views

Why does mercury not form amalgam with iron?

I am learning about solutions and while giving an example of a liquid (solute) and a solid (solvent), my teacher told us that mercury forms an amalgam with all the metals except iron. I want to know ...
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What is the difference between tempering and hardening metals and their end products?

I think I've heard hardening is when you dunk red-hot metal into cold water, and tempering is when you take that hardened metal, heat it slightly, and then let it cool slowly. However what is the ...
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54 views

How does radiation facilitate the formation of tetravalent iron?

In reading the article abstract What Oxidation State of Iron Determines the Amethyst Colour?, the author states that in regards to the gemstone amethyst, from clear quartz: The crystal was ...
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Spectral reflectance identification of types of iron rust

Based on the Wikipedia page about rust, there are red and green types of rust that occur on iron. Red rust is the reaction with oxygen and water and the green with chlorine (in oxygen poor ...
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75 views

Can we picture metallic bonding as an equilibrium between electrons and cations?

Can we picture metallic bonding as an equilibrium between electrons and cations? Suppose: $$\ce{Al^3+ + 3e- <=> Al}$$
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73 views

Structure of a Metal in gas phase

If we have a metal in gas phase. Suppose lets say Aluminum. Aluminum has delocalised electrons. There is Al cation -electron attraction in it. Its easier to visualize Al atomic structure in solid ...
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50 views

Interaction between metalic nanoparticles and aggregation

I can't find any publication to deal with aggregation of colloidal metalic nanoparticles. What type of interaction(s) is/are there between aqeous metalic nanoparticles which give(s) rise to ...
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76 views

What happens in an acid and metal reaction where the acid is twice as concentrated and the metal twice as much in quantity?

Experiment A 3cm metal 0.5M acid 5 degrees temperature change Experiment B 6cm metal 1M acid How much would the temperature change be, and how much faster or slower would the reaction take ...
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961 views

Can metals have a net negative charge

Normal metals like sodium or Calcium have a positive charge as $\ce{Na}^+$ or $\ce{Ca}^{2+}$. Transition metals have a loot of variable oxidation states. Yesterday I read about Iridium in Wikipedia ...
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Why does aluminium foil does not react with water molecules in a microwave? [closed]

Why does aluminium foil does not react with water molecules of food in a microwave?