how to tell the difference between copper and brass alloys?
105749
Brass IS a copper alloy. If you want to tell the difference between pure copper and an alloy, pure copper is soft enough to be gouged with a dull knife.  An alloy will be harder. Could also calculate the density:  Mass of object/amount of water object displaces.  Google density of Copper for the value.
535149
Actually the copper doesn't come directly from the solution...\n\nNot sure how much detail you want, but it does use electroplating.  This means that it uses electricity to plate metal on an object.  The stainless steel object is put on the "positive end" and a lump of pure copper is placed on the "negative end."  A low voltage is used because a high voltage plates too fast, and the layer will peel off quickly.  If copper is the plating, then the solution must be a fairly low-concentration copper sulfate (CuSO4) solution, meaning that copper is the only metal present in the electrochemical cell.  The negative end is called the anode, and this decreases in mass as its copper ions are taken to the positive end -- the cathode.  \n\nThis method of plating multiple metals is actually fairly common, because the properties of each one can be combined.  Nickel can be used for farm equipment and engines because it can withstand a lot of force, silver is used for decoration, chromium is used to withstand a lot of use (like a spoon).  Copper is able to conduct heat and helps food cook evenly.
311514
Here is an interesting fact.  The interior of our bones are lined with copper atoms.\nResearch it, its true.
748391
Current scrap copper prices can be obtained at Demolition, Scrap Metal and Salvage New - http://www.demolition1.blogspot.com\n\nThe blog posts prices on all types of scrap metal including copper, brass, steel, aluminum, ferrous and non ferrous metals
66513
http://en.wikipedia.org/wiki/Copper%28I%29_chloride
332542
Copper is a pure metal. The conductivity of metals increase with temparature owing to decrease in the vibration of the +ve ions in the crystal lattice. Germanium is a semiconductor. Its conductivity decreases with temparature. Hence copper has more conductivity than Ge at low temps.
1110177
Depends on temperature and specific brass alloy.  Above 940 deg C, brass is a liquid.  Below that temperature, most brass alloys are solid.
316653
Depends on the application you have for the copper. You can shield it from oxygen and other corrosive agents using a protective atmosphere.\n\nAt 500°C exposed to atmospheric oxygen you will want a solid metal with a stable passivizing surface or too noble to react. Titanium or platinum will probably be overkill, stainless steel may discolour.\n\nOr you might be thinking about a sacrificial anode, leaving the copper intact but dissolving the connected material (e.g. zinc or magnesium).
787702
Silver has a higher reflective index than any other industry-related metal anhydride.  For economic purposes, titanium isn't used in most commercial labs.  However in some superconductors, the 0.003% difference is crucial.  Though it costs much more.
615709
Copper is used as it has high conductence.\nWith high conductence we get accurate results.\nThis is one the reasons why copper is used in \ncolorimeters.
932445
Copper Metal is a reddish-brown colour, but copper changes colour when it oxidizes.  Pennies are an excellent example of green copper.  New pennies are red, but as they get older and oxidize they start to turn black (copper Oxide CuO) and then green (copper carbonate Cu2CO3).  Copper can also be blue as in Copper sulfate CuSO4, copper hydroxide Cu(OH)2 and copper nitrate Cu(NO3)2.
437503
Q = m.s.ΔT\nHeat loss by the copper = heat gained by the metal.\nCopper (heat loss) = 200.0g x 0.38J/g.ºC x (195.5ºC-228.4ºC) = -2500.4J\ndivide the heat by the mass and ΔT of the metal to get the specific heat of the metal:\n2500.4J/(65.0g x (195.5ºC-18.3ºC)) = 0.2171 = 0.21 J/g.ºC (correct SF)
300790
Here's a link for annealing copper wire.  I don't know if that's what you want.
446562
Flip them. If they ring, they are pre-1981. Alternatively, drop them one by one onto a hard floor. Again, if they ring, they have the higher copper content.
508703
Its possible usually the rivets are brass or copper alloy, if that helps.
1084118
Try Copper Test by points
375662
Take timer and thermometer.\n\nHeat the first metal, and check temperature every 5 seconds or so and write the temperature in a table.\n\nDo it with all the metals you want to check and compare the results.\n\nit should take about an hour depending on how many differnt metals you want to check, and it dont cost much.