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

learn more… | top users | synonyms

1
vote
0answers
13 views

Can a more electropositive metal replaced by a less electropositive one?

I read from this reference that rubidium is extracted by reduction of its chloride with calcium or sodium. How is it possible?. Their electronegativities are much higher than rubidium. I think ...
-1
votes
0answers
6 views

Galvanic Corrosion [on hold]

Four metals are in contact in a ring; a-b-c-d and d touches a again. a is anodic to b, b is anodic to c and c is anodic to d. Does corrosion occur only on a? And at what boundary (a-b or a-d) is the ...
2
votes
1answer
45 views

Alkalide compounds

I have read much more about metallic hydrides but I am totally confused about "inverse alkali hydrides" or "hydrogen alkalides" while reading refer to this. What are these compounds and how do they ...
-1
votes
1answer
62 views

To Debunk the 9/11 conspiracy, what is the science behind melting of the towers architecture? [closed]

I am wondering what the chemical validity is of jet fuel actually melting the steel beams that held up the twin towers during the September attacks.
0
votes
0answers
9 views

Is it possible to make iron shavings dust?

I'm considering how to separate iron shavings from iron. In the picture, there are some iron chunk and iron shavings. The problem is iron shavings are not dust. I want to make the iron shavings to be ...
0
votes
0answers
13 views

Why does a flaky sediment appear when rusting iron nails in tartaric acid?

I am conducting an experiment on the fastest rate the rusting process can have in one of the 6 liquids I am using: saltwater, tap water, lemon juice, tartaric acid, oil and air. I recently checked on ...
1
vote
1answer
35 views

What intrinsic property do metals have that causes their delocalisation?

So I understand that electrons in metals delocalise completely and are free to move around. But my question is, why would something like Nitrogen not delocalise, whereas say Iron or Bismuth does? What ...
4
votes
2answers
129 views

Can silver metal be used to electrochemically reduce copper?

I have a solution of copper(II) ions and several cations. I am trying to reduce the copper ions to copper metal with electricity. My Ideas was to use silver as the anode and a copper wire as the ...
3
votes
2answers
47 views

Lithium metal not reacting with water

To start off with I want everyone to know that I'm not doing this for nay kind if drugs or anything illegal, just having some fun. So I know that lithium( Li) is the least alkaline metal in group one ...
1
vote
0answers
33 views

What is the physics/chemistry behind gold dissolution in water/seawater?

Global ocean contains some amount of dissolved gold (around 0.05-0.005 ppb). Is it ions of gold? Is it just suspended atomic gold (like water vapor in gases - just suspended molecules)? Can pure ...
4
votes
2answers
69 views

How much pressure does Gallium exert when it freezes?

Assuming the liquid Gallium is in a sealed container, how much pressure will it exert on its container when it freezes?
4
votes
1answer
30 views

Formation of Bands in Semi-Conductors

At school, we are learning about semi-conductors and their applications in modern electronics. One of the features of semi-conductors is that there is a small energy gap between the valence and ...
0
votes
1answer
30 views

Choose electrolyte for electroplating

I am planning to try electroplating a steel ring with copper, than nickel, and than finally gold. It seems to me that this would be as simple as using a bath of HCl for electrolytes and attaching the ...
0
votes
0answers
24 views

best metal for mini turbine exhaust blade (i.e. drone)

Based on research I find that all turbine blades for major airlines are titanium with nickle alloy at turbine closest to the fire chamber. But I don't necessarily have all the resources available to ...
3
votes
0answers
22 views

For alkali and lanthanide metals, is there a better liquid barrier to oxidation than mineral oil?

Most often mineral oil is used to store, protect reactive metals from oxidation. By far the best choice is to hermetically seal the metal in pure argon or some other inert gas, since, although mineral ...
0
votes
1answer
69 views

Why is the first ionization enthalpy of zinc higher than expected?

The following sentence is stated in my current chemistry book:- "The first ionization enthalpy of Zinc is higher because it represents an ionization from the 4s level". Now zinc does have an ...
0
votes
0answers
33 views

Why is Ni harder/stronger than Ag?

Deffect-free, single-crystalline (or policrystalline with large grains) Ni is known to be harder/stronger than Ag in the same conditions. Why is that so? I am not considering here work-hardening ...
4
votes
0answers
41 views

ZnO spontaneous combustion during transport

I found your contact information researching ZnO reactions. I was hoping you could please help me or orient me in the right direction to find an answer to my problem. The company I work for produces ...
3
votes
2answers
97 views

Why does sodium react with water to produce a hydroxide, while zinc produces an oxide?

Sodium belongs to the so-called active metals and produces a hydroxide on contact with water. Zinc produces an oxide. Why is it so? I was given a hint: to read up about electrochemical series. I've ...
3
votes
1answer
35 views

Removing aluminum “corrosion?”

I have some aluminum alloy, possibly 6063 or 7050 (no clue really) which has corroded. The finish might be silver-anodized but I doubt it due to the high polish, could be urethane. The item is a ...
14
votes
1answer
397 views

Why does sodium produce predominantly sodium peroxide when burned in air?

From Wikipedia's article on sodium: When burned in dry air, it forms primarily sodium peroxide with some sodium oxide. We know that sodium has a strong reducing capacity, so why does it produce ...
1
vote
1answer
51 views

What is the lowest temperature tungsten starts sublimating at?

What is the lowest temperature tungsten starts sublimating at? I've tried to search in Google but without any luck. For example, WO3 starts sublimating roughly at 550 Celcius degree, according to the ...
4
votes
1answer
70 views

Is there any way to refine Feldspar?

Feldspars are mostly composed of three compounds: KAlSi$_3$O$_8$ NaAlSi$_3$O$_8$ CaAl$_2$Si$_2$O$_8$ I notice they each have Aluminum. Feldspar is far more common than Bauxite (the only Aluminum ...
8
votes
1answer
98 views

What causes metallic objects to ring?

If I use a iron rod to hit a 3" × 12" iron plate there is the distinct sound of a metallic ring. What is the cause of this distinct sound? Is it the crystal structure of iron or that iron is a ...
2
votes
0answers
64 views

Is a substance's band gap related to it's flame test colour?

This is really not my field at all, but I am intruiged by the cause of different metals emitting different wavelengths of light. To my knowledge, the more energy needed to "excite" an electron, the ...
4
votes
1answer
61 views

Why is platinum an excellent catalyst in comparison with similar metals? [duplicate]

What is special about platinum structure which actively participate in catalytic reactions while similar metals with similar atomic structures cannot.
1
vote
0answers
36 views

Why is the melting point of magnesium anomalous? [duplicate]

The melting and boiling points for the Group II elements are as follows: $$\begin{array}{ccc} \text{Element} & \text{Melting point / }\mathrm{^\circ C} \\ \hline \ce{Be} & 1289 \\ \ce{Mg} &...
3
votes
0answers
43 views

What reactions does this steel cold-bluing solution undergo?

Bluing steel generally refers to the process of forming a protective layer of $\ce{Fe_3O_4}$ ("black iron oxide") that prevents normal rust from forming. The chemistry behind the traditional ...
3
votes
2answers
41 views

How to determine pH of food in order to avoid unsuitable storage containers

In an acidic (lemon-containing) sauce I had placed a metallic spoon. A few days later it had a metallic taste. Stainless steal might be a significant source of nickel, chromium and iron [1]. Also, ...
0
votes
1answer
88 views

Bond Type of Lead: Metallic or Network Covalent?

I know that lead is classified as a metal, from its appearance, nonexistent band gap, and its position on the periodic table... etc. However, all of the elements above it (carbon, silicon, germanium, ...
0
votes
0answers
22 views

Basis of structural change of tin | Tin pest

What is underlying molecular intuition for the phenomenom of tin pest where tin under 13°C undergoes change in its crystal structure? Is the idea same as freezing of water, where atoms lose their ...
0
votes
0answers
51 views

What is this black substance coating the brass after soaking with acid?

I have a radiator with a brass chamber and H90 brass tubes that I wanted to clean(if I remembered correctly there was just a few black spots on that chamber) , so I poured a bit of white vinegar and ...
12
votes
4answers
278 views

Do there exist metals that are composed of molecules?

Most metals are composed of pure elements or are alloys (mixtures of pure elements.) Are there metals that are composed of one type of molecule that is metallically bonded together? The difference ...
3
votes
1answer
91 views

Why are metals conductive in terms of orbitals?

Back in high school I was taught a definition of metals: Metals are a lattice of positive nuclei embedded within a sea of delocalised electrons Metals are conductive because the electrons aren't ...
1
vote
0answers
16 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 ...
1
vote
1answer
41 views

Why is silver nitrate used for cyanide titration?

Or more to the point, since silver isn't exactly cheap: Why can't cuprous nitrate ($\ce{CuNO3}$) substitute for the pricier ($\ce{AgNO3}$) in cyanide titration? I assume that free cyanides bind ...
0
votes
2answers
97 views

Which compound reacts with calcium oxide

Originally, I thought this question was asking for reactivity. So I thought since sodium is higher in the reactivity series (or have a more negative standard electrode potential) than Ca, then it ...
1
vote
1answer
73 views

How to check purity of Mercury metal

Mercury is a very good solvent for many metals. We have mercury metal available, how do we check for its purity? Is there some kind of test available to verify its purity? and more helpfully which ...
1
vote
0answers
68 views

Why is mercury's surface tension so high, when its viscosity is low?

At a basic level, both surface tension and viscosity are the result of forces between particles. Usually we'd talk about intermolecular forces, because liquids are usually molecules, but obviously ...
4
votes
1answer
82 views

the longevity of amorphous metal

I gathered that many of amorphous solids are made by quickly cooling the liquid material, thereby giving it no time to form any long-range order (crystallinity). So it makes a perfect sense that when ...
1
vote
0answers
56 views

How does vinegar get rust off these coins

As experiment I found some really nasty rusty coins on the street. They were green. After looking on a website I found vinegar could eliminate the rust. It worked pretty well. I know this is a redox ...
0
votes
0answers
80 views

Why do polymers have higher coefficients of linear thermal expansion than metals?

What started out as a homework question is now bothering my brain. I have always known that metals expand pretty well when their temperatures increase. Also, I have never heard of polymers like Teflon ...
0
votes
0answers
30 views

Can copper, nickel and chrome plating process only be done with HCl solution?

I want to know if electroplating process can only be done with HCl acid, without any copper, nickel , zinc and chrome liquid solutions? means equipment DC battery anode rode (zinc, copper, nickel ...
3
votes
1answer
118 views

Does mercury amalgamate with Brass or Steel?

Does mercury amalgamate with Brass & Steel ? Details: I am designing a micro pump to dispense mercury in micro quantities (300 - 700 mg). I am planning to use 2 check valves with syringe to suck ...
3
votes
0answers
67 views

Relative etch rates of nitric acid on metals and oxides

I am trying to either find or calculate the etch rate of nitric acid ($\ce{HNO3}$) for various different metals and oxides. The ones I am interested in are titanium ($\ce{Ti}$), zirconium ($\ce{Zr}$), ...
0
votes
0answers
8 views

Enthalpy of Formation of Alkali Metal Halides [duplicate]

A book that I am currently reading contains the following lines :- The Enthalpy of formation for fluorides become less negative as we go down the group, whilst the reverse is true for the Enthalpy ...
0
votes
1answer
60 views

Calcium reactivity vs electronic configuration

Calcium is an alkaline earth metal, so it is reactive. But, it has two valence electrons. Don't those two electrons fill up the first energy level? Isn't an atom with a full energy level considered ...
3
votes
2answers
119 views

Would tin (II) sulfide be considered a covalent network solid?

Considering that tin has a Pauling electronegativity of 1.96 and sulphur 2.58, and that a bond is considered to be ionic with a Pauling EN difference of approx. 1.7 at the least, would tin (II) ...
3
votes
1answer
25 views

Why does dry boiling discolor steel cookware?

I have a stainless steel kettle that I let boil dry. That is, I left it on a hot coil burner with nothing in it, and noticed a few minutes later that the bottom was red hot and smoking. To make ...
0
votes
0answers
49 views

How does a metal atom's size affect the electrical conductivity of it's giant metallic structure?

In giant metallic structures, how does a metal atom's size affect the structure's electrical conductivity? (i.e. what happens if you go down a group of metal elements?)