Metals Definition and 318 Threads

As is commonly known metals are good mirrors i.e. they reflect very well visible light. I wonder whetehr is it true for frequency much higher then the frequancy of visible light. Does exists the frequency for which metals are almost transparent?

Why do Fe-C and other metals exhibit upper and lower yield points? And also can you get substitutional solid solution in any Fe-C metals, like ferrite, austenite etc?

[b]1. When reacting metals with water, under what conditions do you get hydroxide and under what conditions do you get oxide? [b]3. is it all reactive metals like Na and K form hydroxides and non-reactive ones form oxides? Can anyone tell me the details of the reasons for such difference?

for metals the conduction and valence bands overlap. So how do you distinguish between the conduction and valence bands? How do you find out the lower limit of the conduction band and the higher limit of the valence band? Or is it the case that the highest conduction band in a metal goes from...

In a 1964 publication Bruno Rossi describes an experiment where cosmic rays could penetrate dense materials. Finding that cosmic radiation at sea level could penetrate over 1m of lead. In these same experiments he was also surprised to record a higher rate of detection, as many as 35 per hour as...

Could someone please explain to me the idea of M state metals, or Mon-atomic metals, I've heard that they were High Spin superconductors and that when heated they loose weight, so much so that the scale they are placed on reads negative. So, my questions are: How is this possible, and Why on...

Hello, I'm trying to find a metal that has a conductivity that's about 150% that of stainless steel grade 384. I've been looking for some charts that compare conductivities of metals but all the charts I find seem to have a few discrepancies. Could someone give me a link to a reliable chart...

how many metals can amalgam on mercury ?

hey guys, I've been given an assignment on the topic of eddy currents and magnetic induction. We have been given info that when a magnet slides down an incline over a magnetic sheet, the eddy currents in the metal acts as a braking mechanism (lenz's law). I've done some research and what i...

Why is alchemy not real? Did anyone ever figure out how to change base metals into gold? What is the closest anyone has ever come to this? Assuming they haven't , why can't they do it?

Ok so my question is as follows: Can Maxwell Boltzmann statistics be used to describe electrons in a metal at room temperature? I know that the Fermi Temperature in metals is about 10^4 K or something rather high, so does that mean that the metal / electron gas would need to be at a...

Homework Statement I'm struggling to understand the relationship between the Debye temperature and the speed of sound in a substance. An example problem given is: Estimate the Debye Temperature of Silicon and Lead, given that their respective speeds of sound are 9150 m/s and 1320 m/s. (not...

Homework Statement I'm given two identical pieces of metal (in size, shape, color, density, etc.) and no other materials to work with besides my hands. Using only those two pieces of metal and my fingers, I am tasked with determining which of the two pieces is a permanent magnet (the other is...

If one were to take a powerful source of electricity, such as a bank of high-voltage electrolytic capacitors, and short the source across a thin length of metal wire, the wire would "vaporize." My question, is what is actually happening to this wire? If it were a very thin strand of aluminum...

What are the dielectric constants of metals and i have heard that some materials have dielectric constants that are complex numbers. Please tell me which materials have complex Dielectric constants?

Hi, It is seen that noble metals (gold, silver) show a negative permittivity in optical frequencies. Can somebody explain the physical interpretation of this phenomena? How is the negative permittivity measured? Really appreciate if someone could point me in the correct direction. Thanks.

Why is standard reduction potential of beryllium and magnesium lower as compared to heavier members of the group while the reverse is true for alkali group? I read somewhere that this is due to more negative hydration enthalpies of these metals but shouldn't it make oxidation of these metals...

A 2 gram Magnesium (Mg) ribbon is burnt in air . The burnt ribbon is collected and weighed. Would it be greater than 2 grams or lesser?

I have a question regarding the possible oxidation states of metals. I understand how to find the oxidation state of a metal in a compound, that's pretty straightforward. What I'm interested in is finding possible oxidation states given only the name of the metal. For example, Cu has possible...

I'm trying to wrap my mind around the concept of metals dissolving in water under different electrical potentials. For example, platinum is know to dissolve in liquid water when subjected to 0.65-1.1V. Why does this happen? I'm guessing it has something to due with water being so polar but why...

Metals with what type of crystal lattice less prone to brittle fracture? Why?

Homework Statement Transition metal species are known that contain multiple metal-carbon bonds, for example, M=CH2. Describe how the π portion of the M=C bond would be formed using a pure d orbital on M and in what plane the protons on the CH2 group would lie. (A d orbital is employed because...

Hi all In the following link it says: http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/thercond.html "For metals, the thermal conductivity is quite high, and those metals which are the best electrical conductors are also the best thermal conductors. At a given temperature, the thermal and...

Hi, I'm a student learning Solid State Physics and in a chapter of Classical Free Electron Theory of Metals in the textbook, it mentions "Since in the absence of a (electric) field there can be no net current, it is clear that the average thermal velocity over the equilibrium (thermal velocity)...

Homework Statement The inner diameter of a steel ring is 2.0000 cm, and the diameter of an aluminum disk is 2.0100 cm. Both are at 430 degrees C. At what common temperature will the disk t precisely into the hole in the steel ring? alpha(Steel) = 1.3e-5 alpha(Al) = 1.9e-5 Homework...

Im guessing it's something to do with their metallic bonding of sorts?

If a circular beam consists of two separate metals, both having different inner and outer diameters, and one engulfs the other, how is the amount of twist able to be determined when the beam is connected at both ends to walls to form a composite shaft and is subjected to a torque? I Know that...

Homework Statement Show that, 'In p-block and d-block metals their carbonates,sulphides and hydroxides are insoluble" I understand that all carbonates are insoluble(except the alkali metal carbonates), also that all sulphides are insoluble,but it's the solubilty of hydroxides that I'm...

Just want to make sure my understanding is correct... Here it goes: 1. Metals have free electrons, which can be in a myriad of energy levels, including those corresponding to the full range of frequencies in the visible region of the spectrum. 2. Light shone on a piece of metal thus...

Hello all, I was wondering if there was a way to calculate the reflectivity of differing wavelengths of light hitting an element based upon its physical properties. I know that it is based on how the atoms of the material are excited based upon the wavelength hitting it. I eventually want to...

This seems like almost too much of an elementary question, but what properties of metals / insulators cause their bandgaps to differ?

The literature i have on the origins / need for an effective mass of electrons seems only to relate it to the explanation of heat capacity of metals but it seems like the concept has applications far beyond this. Can someone pls provide a more general summary of its derivation and applications...

has anyone mixed titanium,tunsten,carbonated steel,vanadium and chromium togeather to make a alloy

I need to know how to find the time required for metals such as steel and copper to reach a temperature of the environment in which it is placed, based on its mass and the initial starting temperature such as the room temperature. This is important for me because I am going to start up an...

Hi, In my chemistry report I have include metals that are extracted from Carbonate ores. I was unable to find any other than Zinc from my own research. I am aware of Limestone and Dolomite. But is Clacium extracted from these ores? Could somebody inform me of any metals that are extracted...

Hi all, I have a few odd questions. 1. Can electromagnetic fields influence electrons orbiting around a nucleus? 2. Would it be possible to squash an electron "cloud" into a ring or saucer shape by the application of magnetic fields (think of Saturn and its rings, Saturn = nucleus & rings =...

"Which metals tend to be stronger, those that form FCC or those that form BCC crystals? " This is the solution provided which doesn't make much sense to me: "You should look at APF and coordination number of each crystal system to base your answer" Is this even a valid question? Doesn't the...

where can i find third order elastic constants of metals such as bronze steel ? sincerely

Im having trouble finding information on google about how car suspensions are manufactured and what type of metals are used. I am curious in understanding what the benefits and drawbacks are to using different metals. For example how certain metals will react when they are under compression. Are...

http://www.treehugger.com/files/2006/04/peak_copper.php http://www.thenational.ae/article/20080807/FOREIGN/629722880/1013/ART&Profile=1013 Any truth to this, or is this debunkable?

Can radio waves propagate through the walls of a solid steel (1/2" wall thickness) box that completely encloses the RF transmitter? Do lower frequencies work better? Any insight would be great. I'm a newbie her, so please be gentle.

Have any studies been done on the elastic properties of two unlike metals? I have noted a difference in the sound frequency of different horseshoes. Specifically, what is the effect of a horseshoe of one frequency striking a stake of another? I also assume that the speed of the strike is...

Hello, Recently,I study about the slip systems of metals which regarding to the material science subject. For face centered cubic(FCC),it slip system is {111}<110>.Hence the number of slip systems is 12.The{111}is the family for (111), (-111), (1-11), (11-1),(sorry！-1 means a bar line on top...

Where do I search to find what, if any tests have been done to see if ingested chlorella would effect colbot in the body in the form of a joint replacement?

I was wondering if anyone knew of links to different websites that stated the coefficients of resistance for different metals. Mainly copper, and steel equipment. I am working in a mill and my supervisor asked me to find out these values. There is copper cable running as ground and...

Hi, I want to learn that do atoms or crystals dislocate in the plastic deformation of metals.

We done an experiment of tensile test where we used the testometric machine that pulls different kind of material (aluminium, PVC, steel, brass) and generated graph stress/strain and etc, now we come to these questions: 1. Explain why the plastics/ polymer has a lower modulus and strength...

What type of metal are typically in wires? I believe that usually wires are made out of copper. Are most wires made out of copper? Does the size of the wire usually determine what metal is in a wire? For instance, are larger wires typically composed of copper, while smaller wires are...

I am using water electrolysis, and I need some bolts to be the anode/cathodes and I don't want them to corrode. Before anyone asks I will not be adding salt so there will be no chlorine. Thanks!

Is there is a reason why the elements in that 'family' tend to be more satisfied with having their higher s orbitals half filled before their d orbitals and another thing, why is it that from Sc to Zn its size remains static (that is strange considering its Z eff is increasing)? There's also...