Metals Definition and 340 Threads

There was a post on stackexchange.com explaining the trend in melting/boiling points of first series transition elements. https://chemistry.stackexchange.com/questions/4766/melting-and-boiling-points-of-transition-elements The specific question was...

I heard an explanation about something being a better proton acceptor or lone pair donor but that doesn't make sense. I couldn't explain in in terms of acid-base theory. The hand-waving way I saw it was that metals are less electronegative than non-metals, so in water, they'll donate their...

Hello, Do all of aluminum bars (or load cells) made from the same type of aluminum (i.e high purity aluminum or different types of aluminum alloys) share the same exact compressive strength or are there variations in compressive strength even among the same type of aluminum like high purity...

Hi, Can I get help ranking Copper, Brass and Bronze by Thermal Conductivity? This stuff below says Copper is the best Thermal Conductor, and Bronze is the worst. https://en.wikipedia.org/wiki/List_of_thermal_conductivities https://www.engineersedge.com/properties_of_metals.htm...

[I do not know if this is the right subforum] The answer to the question to the title is: for very long time. However the tuning fork clearly has to stop at some point because some of the energy will turn into heat. However I want to quantify for how long. More specifically I am interested on...

I'm sorry I'm uploading lots of images because I don't know how to write equations here. PROBLEM DESCRIPTION I have to solve this problem: Figure P3.6: MY SOLUTION I did this: THE CORRECTION I got this as a correction: - Don't use the middle line in figure P3.6 in my calculations. -...

a. We know metals emit EM radiation upon heating or electric current. I'd like to understand more fundamentally how this phenomenon takes place, on the basis of the basis of band structure, and which electrons are involved ? b. Classically, charges emit radiation when accelarating or...

Steel and other metals data sheets and mill specs most commonly quote some tensile strength metric, like Proof, Yield or Ultimate Tensile Stress. Less common is the value for shear strength. Often as rule of thumb the allowable shear stress is taken as half the allowable tensile stress but, when...

All data I see online about reflectivity of metals is about aluminum in the atmosphere meaning oxidized aluminum, but pure aluminum in vacuum in case of the James Webb telescope would also be extremely reflective but building it on Earth means it's going to get oxidized, similarly there are a...

I looked for solutions on the internet but all of them had given mass and looked for volume , but that isn't given here. I tried something like subtracting the two weights or trying to find mass from the weight but i can't find the correct awnser

I am looking to try to create an alloy of gallium (probably with Tin) with a goal of increasing the melting point from 29°C to around 40°C. My current theory is to simply try to average the two melting points out by mass, which my calculations imply means 95% Gallium to 5% tin. my calculation...

It is felt that inelasticity can be used interchangeably.

Hello everyone. I have reading about IR radiation, reflectivity, and emissivity of materials. Metals, in general, seem to be excellent reflectors or IR radiation (they are like infrared mirrors. That said, why do they get so hot when they are left in the sun? A metal roof cannot be touched...

In a block of metal, each metal has a characteristic speed of sound. When metal is under tension, such as a guitar string, the speed rises as the tension increases. How does the speed vary (in a block say) as a function of tension along each of the three axes? I am assuming that transverse...

If we have a small dielectric sphere and a point charge, they will experience an attractive force due to electrostatic induction. (From the elongation/rotation of charges bound to individual atoms). Likewise, if we have a small metallic sphere and a point charge, they will experience an...

Hello. I am new to this forum and joined because I am at home nerding out trying to work something out. Why do white hot metals seem to be much cooler than white hot stars. The attached picture is from Wikipedia relating temperature of a hot metal to its temperature. For example a red giant...

No idea where to start

I learned in school that when two different metals come in contact with each other accelerated corrosion will occur. How about alloy and metal with painted surface? For example, I think that stainless steel is very unreactive / non-reactive. Could it cause any accelerate corrosion to itself or...

Why d and f orbitals in transition metals considered localize? Is it an experimetal result that d and f orbitals are more near to nuclea than s orbital in transition metals or there is another reason for considering them localized in a solid?

Hello! I am having trouble to understand why the emissivity of polished metals is much lower than if they are not polished. Consider, for example, non-polished aluminium at 300K, which is said to have an emissivity of 0.77. We put it floating in vacuum. There is an energy source near it, and in...

I work for municipality with urban management and i have a interest for the environment, and have become fascinated with metals. Together with a engineer i will be making a report about metal reactions etc. So i would like to get you guys take on these questions that i have in mind for my...

Transition metals, being metals, are electropositive.Ligands like ammonia,oxygen,chlorine etc ,on the other hand,are mostly electronegative(electron loving).How come the Ligands donate electrons to the electro positive(electron hating)transition metals when both have contradictory...

Where a metal melts before its oxide, can that oxide be solvated in the liquid metal? Likewise, if the metal oxide melts at a lower temperature can that solvate the metal? If not generally, can it happen for some metals, or none?

Would a small (of order 5 microns to 0.5 mm) liquid metal droplet, if cooled slowly away from external perturbations and not in the presence of oxygen, retain its highly smooth and polished surface as it froze? What phenomena would influence the surface roughness? I assume that simple density...

A makeshift metal detector can be made if you have an accurate INDUCTANCE meter and a coil of a large diameter. Instead, I've got a capacitance meter, this one: http://www.pw-electronics.co.uk/DMM.pdf How can a little circuit be added (like a capacitor with a resistor in series or in parallel...

Hello all, I am curious as to whether it is possible to create aluminium from a thermite reaction. Thermite, as standard, uses aluminium and iron oxide, which react together when burnt to create a blob of molten iron. I would like to achieve a similar result, but with a blob of molten...

Does all transition metals have their n2 and ( n-1)d orbitals as valence electrons? I have been scouring the internet to the answer of this question but have mixed results. Iron has an electron configuration of: 1s2,2s2,2p6,3s2,3p6,4s2,3d6 Aparantly it has 8 valence electrons because 4s2 + 3d6 =...

A recent paper in Nature describes a new phenomena found in superconducting materials: https://www.nature.com/articles/s41567-018-0334-2 Quanta magazine wrote about it here: https://www.quantamagazine.org/universal-quantum-phenomenon-found-in-superconductors-20181119/

Hi everyone... I work in a rolling mill that produces train rail tracks. But I'm experiencing some problems. The guards I use keep breaking. So here is the scinario. The rail we make is 40kg per meter. With a total length of around 65m. When it goes thru the mill pressure is applied to it in...

I am trying to find a way to decrease the force between two magnets by putting a physical barrier in the middle of them. I’ve reasearched and found that Mu metals redirect the flux of the magnetic fields so those two magnets shouldn’t have any noticeable attraction between them. Of course...

In practice, ESR/EPR seems to concern only unpaired electrons in the outer layers of organic radicals or complexes. But what about the free electrons of metals? Does it also give rise to a signal? I can't find any information on the web. Thanks

Homework Statement This a question from an olevel paper and the marking scheme says B I don't understand why Homework Equations None a theory question The Attempt at a Solution Aluminum and copper has less magnetic property while iron is good magnetic material. I cannot understand why the...

A little background: Inspection room is kept at 20 C +/-2 C. Temperature gauge is accurate to +/-.5 C. Outside ambient temperature where parts are kept can vary from 5 C to 38 C. One part in particular is a rotor made of 4340 steel, ~2350mm long, average diameter of 115mm, and weighs ~ 650lbs...

Does anyone know of any studies into exactly how much various metals reflect or absorb microwaves with relationship to the microwaves wavelength and ideally theyt compounds too?

Hello Colleagues, I have a project for medical application. It has a cutting part for precise incisions. It should have excellent notch tensile strength and resistance to pitting corrosion. Obviousely this should be surgical steel or titanium. What would you take?

https://eng.libretexts.org/Core/Materials_Science/Optical_Properties/Metallic_Reflection According to this article,metals are good reflectors at low frequencies.What about at high frequencies like visible or UV spectrum?Will this show deviation

Homework Statement So i have a few scenerios on my physics prelab that I want to clear up and understand. 1) What happens to the temperature when you heat up a solid metal much below its melting point? 2) What about when the solid metal starts to melt (and you are heating it still)? 3) What...

sorry I am going slightly off the topic. <<Moderator's note: split off from this thread.>> I asked this question because I'm studying a paper concerning the presence of spin orbit coupling at the interface between two metals. This is the part of the paper I'm studying: "Our aim is to...

Why does a tungsten filament light bulb (or any heated metal for that matter) emit EM radiation (both visible and infrared) - is the EM radiation due to vibration of molecules or electron excitation?

Does electron gas in metals experience viscosity? Also, does highly charged plasma experience viscosity?

Regarding a recent article from phys.org , Chilean researchers have conducted a study of an old, metal-rich cluster, NGC 5927. Interesting results are the abundance of many metals, which include sodium, aluminium, iron, oxygen and some heavy metals such as yttrium and zirconium. Thank you.

Hello How the surface tension is measured for molten metals? I have heard about the sessile drop, but it seems to be a very inaccurate method... Thank you for your time. Regards.

Consider a metal such as Al. How do we look up or determine the relative permittivity of the metal? Suppose we have some known incident frequency, say about c/500nm for visible light. We can look up the bulk plasma frequency (3.7 PHz for Al), can it be calculated from that? For context, what I...

What gives metals their Lustre? One of my books(living science chemistry by arun syamal) says that the electrons achieve a higher energy state by absorbing energy and come back to their ground state by emitting it of which light is a part but my teacher tells that it is due to the crystalline...

Negative permittivity of metals – The effect of light-trapping via plasmonics I’m trying to understand the effect of light-trapping by plasmonics (for example - Localized Surface Plasmon Resonance, Surface Plasmon Polariton, Scattered Plasmons), and how negative permittivity related to that...

I've read that when two pieces of the same kind of metal touch in space, they will fuse because there is no way for the electrons to "know" that they are in different pieces of metal. What would happen if two different metals were to touch in space? Would electrons still flow freely between...

I wonder about what will happen to the metals and alloys such as iron, lead, argent, gold, mercury, cambium, steel, nickel, bronze when thrown into the soil. Can bacteria decompose them such as organic components? They were already under the soil before men picked them out. This is a very hard...

This question is purely theoretical, so don't worry about safety or doability. Is there a way of calculating how many watts it takes to heat different metals? To be specific, how many amps and bolts it would take to get lead to its melting point. Thanks in advance.

The heat capacity equation Cp for copper as a function of temperature (Shomate equation) for the solid phase is defined for the range of 298-1358 K in the Nist Webbook and in many books. http://webbook.nist.gov/cgi/inchi?ID=C7440508&Mask=2#Thermo-Condensed And I need to calculate the heat...

Homework Statement hi guys I am conducting an experiment for my coursework in physics and i have come across a bit of a problem. i am trying to calculate the youngs modulus of 3 different metals Aluminium steel and brass. To calculate the modulus of the material i am using a chart of Mass k/g...