Metals Definition and 318 Threads

Homework Statement While taking photographs in Death Valley on a day when the temperature is 59.0°C, Bill Hiker finds that a certain voltage applied to a aluminum wire produces a current of 1.000 A. Bill then travels to Antarctica and applies the same voltage to the same wire. What current...

Hi all, I'm keen to find out more about electron ejection from metals. Eg multi-photon photoelectric effect and thermionic emission. I've come across a few texts (Kittel) which deal with them in a general sense but can anyone recommend a more detailed analysis? Some questions which I...

for an example, polycrystalline silver, its index is n=0.135 and k =3.999 at the wavelength of 633nm, what does the nk mean, is that telling us the wavelength in the silver equals 633/0.135 nm ? and how to calculate the refractive angle in the metal? Give a good explanation, please.

Is the free-electron model synonymous with Drude model? or is Drude model a special subset of the free-electron model? I have seen texts that refer to a "free-electron model" and do not mention Drude's name. and i have also seen texts use these two terms interchangeably. Sorry, i have no...

When individual atoms bond to form a metal lattice, the total energy decreases, but does the kinetic energy of the electrons increase or decrease? What about the potential energy? Does it increase due to pauli exclusion or decrease due to the decrease in distance between the ion and electron...

Basically my project is to present a method of removing Fe, Mn, Ca or Mg from water and then do an experiment on a sample of water with the heavy metal in it. I've been doing a lot of searching online so far, and most of what I have found does not relate. I need something that I can actually...

Edit: Just realized that maybe I should have posted this in a different forum... sorry about that. Basically my project is to present a method of removing Fe, Mn, Ca or Mg from water and then do an experiment on a sample of water with the heavy metal in it. I've been doing a lot of searching...

I have a question that my teacher can't answer. :( I get that with the electronic configurations for atoms, an s shell fills before a d shell but also empties before a d shell. Okay. So the last couple of subshells for iron are 4s2 3d6; Fe2+ would be 4s0 3d6 and Fe3+ would be 4s0 3d5...

How come both spring and rubber band are elastic whereas spring are contracted and rubber bands are stretched? I understand that elasticity of an object depends on it ability to reform from deform. I also get that spring works b/c of normal force(too much contraction...right?-being the reason...

If you have the primary and secondary coils of a transformer next to each other, then current will induce a voltage in the secondary coil, creating current flow. This question applies to motors as well. If I place a sheet of steel between the two coils, will I still induce a voltage? For...

[SOLVED] conductivity of metals Homework Statement http://www1.union.edu/newmanj/lasers/LaserTypes/conductionbands.gif I do not understand this picture. Why does the fact that the valence band for the metal (conductor) is half-filled imply that it has high conductivity?Homework Equations The...

Why don't metal objects such as a nail get charged by friction like the famous comb, plastic rod or glass rod - all insulators?

The resistivity arises because the electrons collide with atoms so they flow slower. The resistivity of different metals differ a lot. What determines the electrical resistivity of different metals? It is related to their structure? How?

Hi! I'm writing a lab report and have some questions that I can't find the answer of... I really hope that someone can help me. Homework Statement 1. First of... I'm having a small problem with writing an equation for Zn reacting with a HCl solution (only H+ should be in the equation). 2...

For an electrochemical cell containing two metals how do I figure out which one reduces and which one oxidizes using standard reduction potentials? Thank you very much for the help.

Hello! In my course of solid states physics we use the fermi-dirac statistics for a free electron gas in metals. The fermi wave length of the electrons is about 1 Angström. Now, the wavelength may be intepreted as something as a coherence range - the electron should forget about the state of...

I know that heat increases the velocity in which the atoms move with in a solid substance that leads to farther expansion, and cooling does the opposite. My question how ever is this: will an alloy or metallic substance (say Iron) crack or break via accelerated heating then rapid cooling...

Will Helium diffusion through stainless steel at 250 Deg C and approx 700 psi Delta P present any practical problem?

Is practical to employ fractional distillation methods on a mixture of two metallic elements with low BP - for example Hg and Zn? And no, I'm not trying to do this.

people say metels conduct electricety but if that's true how cum metal pilons don't zap people when grounded. also i have a trick stapler that zaps people how cum its not very painfull

"Sea" of electrons in metals Is it a "floating" sea of electrons in metals? meaning they are not restricted to a spot relative to the atoms, but they just "float" around as long as it's in the metal, and the charge is almost perfectly level throughout the metal. (I doubt it would be absolutly...

just a general interest thing for chemists. i was shown this youtube video the other day: http://youtube.com/watch?v=gRuoWkOlaHM it is the show Brainiac and they are demonstrating Alkaline Metals reacting with water. They show brief Lithium, Sodium and Potassium reactions; then drop 2g...

Is there any way to predict what crystal structure a pure metal element will be? It seems that the simple 'electron sea' idea does not explain a lot of things. Thanks -scott

A metal is not a good dielectric. A vacuum is a decent dielectric. There are much better dielectrics than a vacuum. A high dielectric constant, k, means the material exhibits good dielectric behaviour. A vacuum has k = 1, better dielectrics have k > 1. What is the dielectric constant of...

Homework Statement Having done an experiment measuring the intensity of light reflected from copper, lead, zinc and iron, i found that copper reflected the most light, then iron, then zinc, then lead. Now i have to explain it and I don't really know how to ! The Attempt at a Solution...

it is known that in metals the electric field is zero because there are free charges inside that rearranges in such a way that it cancels the external electric field. If the external electric field is large enough, so large that all the free charge inside cannot rearrange itself to cancel the...

I heard that it's good to put metals like steel in the soil in which the plants grow in. Is that true? How does it help the plant? Does it act like a source of minerals?

Hi. Was wondering if anyone knew where i could find a list of the metals and their specific heat capacities. All i have found is this one: http://www.engineeringtoolbox.com/specific-heat-metals-d_152.html but i would like one that deals with all the metals Thanks

Hello, I need to know the fundamental frequencies of the noble metals "silver, gold, platinum ... etc" .. thank you very much

For my advanced higher physics investigation I've been given the topic of thermal conductivity. Basically I am going to investigate the thermal conductivity of different metals and compare them to the electrical resistance of the metal as I believe that those with low electrical resistance...

Hi, I'm a bit confused with the Wigner effect concept. This effect is normally associated to damages in moderator material typically graphite. But metallic cladding of the fuel element is also exposed to fast neutron, but Wigner effect is seldom being used as a term to explain the damages in...

I thought that as a general rule when writing out compound names (in full) involving a coordination metal, the charge of the coord metal must be stated in Roman Numerals. If nothing is specified than a charge of +1 is assumed. But I came across a compound involving zinc written zinc...

This is not a homeword question but an answer to a homework question of which I do not understand the reason for. The question was what are the differences between transition metals and main group metals. The answer was that transition metals can have colours but main group metals cannot. Why is...

Does anyone have a link or reference to a table on the effective mass of electrons in the common metals? thanks

hey. I am doing an investigation into reactions of acids with Mg. Firstly, iv investigated how order with respect to the acid varies for different acids i found that the orders for each of the acids are: Hydrochloric acid: 2 Sulphuric acid: 1 Phosphoric acid: 1.8 in an article, it said that...

Of the following 6 metals (Ca, Mg, Zn, Fe, Sn, Cu), which should be the most reactive toward oxygen? I don't understand how you determine this...what should I be looking at and/or calculating?

Hello, I was wondering if the Pauli Exclusion principle still applies to electrons in a metal. My intitution tells me no since a magnetic field acting on a metal causes the electron spin to realign but I am not sure. Thanks, -scott

How would I go about determining the specific heat of a metal (like Sodium) that reacts with water?

this question was in my material science exam . by the way I'm not very good at this subject

I was woundering? why did the free electron theory of metals fail (the free electron model)?

Hello, Assume that we have a pipe flowing with air of around 80 degrees F surrounded by air of approximately 140 degrees F. The pipe can be made out of three materials: Aluminum, Mild-Steel, and Stainless Steel. What material would it be best to use for the pipe in order for the air flowing...

I was wondering if it would be fair to say that the frequency at which x-rays start to penetrate a metal would be the plasma frequency associated with the electron density of the metal, i.e. the frequency given by http://scienceworld.wolfram.com/physics/PlasmaFrequency.html or whether some...

The following data shows the conductivity of 5 metals and the rate of change in gravitational potential energy due to induced current when the metal is passed through a electromagnetic field of 5.4mT on the end of a pendulum. you know, the classic eddy current experiment. I'm just wondering if...

Can someone please remind me how to convert values of Heat capacaty at constant pressure to heat capacity at constant volume? I believe it has something to do with the volume expansivity (1/V)*(dV/dT) at constant pressure, but I can't find my therm textbook and I can't remember how to proceed.

i know that if you want to figure out how many electrons an atom has on its outer ring (valence?), its 1 for group 1 (eg Na), 2 for group 2 (eg Mg), all the way to 7 for halogens and 8 for noble gases. however, how do you figure it out for transition metals in the middle? for example...

Which alkali metal forms preferentially an oxide rather than a peroxide or superoxide? a. Na b. Rb c. Li d. K Of the following, which element has the highest first ionization energy? a. Na b. Al c. P d. Cl Are these correct? Thanks.

Hi all. This is my first post. I'm a little eluded by this question given to me... "What does the photoeffect (photo-electric effect) tell about electrons bound in metals" It seems a bit too trivial to me. I'm tempted to just say that since the work function is proportional to how...

Why metals are often used in the form of alloys? Is that becuz the metals become stronger only...or there r other reasons.

I was wondering what kind of force is the force of gravity ? Is there a subcategory of that specific force ? (Got any internet documentation about it, too ? It would be nice.) I got another question: in the air, are there particle of metals (negligeable when studying the air's components)...

Without getting into too much detail on what I am building, here is what I am basically asking, Will Soidum Hydroxide (NaOH) corrode brass? I am thinking yes. Bras is made up of zinc (which I know NaOH will corrode) and copper (I am not sure about copper). Basically, I have a value, made...