old copper materials are annealed to make them soft. we normally heat to 500 degrees C and quickly throw in water. is it ok?
125310
Here's a link for annealing copper wire.  I don't know if that's what you want.
47599
You could fill a sock with rice or buckwheat, heat it in the microwave for 90 seconds or so and it should provide nice heat for one to two hours.  It's not a chemical handwarmer if that's what you wanted, but it would work. You could react muriatic acid (available in hardware stores) with lye (some oven cleaners) and it would warm up, but I wouldn't recommend it, as you're dealing with HCl and NaOH, both caustic chemicals that will burn you if not careful.  But when they are mixed, it is a pretty exothermic reaction, but not really nontoxic per se.
330836
Technically a process can require the addition or extraction/removal of heat ENERGY.\n\nI cannot off the top of my head recognize a chem formula any longer, but adding oxygen to any system is oxidation and generates its own heat.  Tehcnically even iron rusting generates heat, just a very small amount, since any metal "rusting" is just it oxidizing.  \n\nAs far as the ice cubes, simply the removal of heat will not cause water molecule to become ice crystals,  I apologize, but I forget why.  I remember an experiment I saw and tried.  In a very clean container, pour distilled water. Now cover that container with another container that does not touch the first.  (Like putting a big bowl over a smaller bowl with the distilled water.  The water stays liquid all the way down to around -20 C.  But if you damage the stablility of the bowl by say gently tapping the side, the water will then turn to a solid.\n\nSnow in clouds form when the water molucle has a dust mote or other item to cling to and begin forming the ice crystal which eventually gets heavy enough to possibly fall all the way to the ground.
71063
just saying a heat absorber is not enough , for what purpose , this is science and accurate answer , cooper , aluminium , water , oil. ..etc , pls define more
66948
I saw a very weird program on BBC America (or the discovery channel) where they made a furnace and put the ore in a cruicible with crushed glass.  After they melted every thing down, the impurities from the gold bonded with the crushed bits of glass, freein the gold from the ore.  You need a lot of heat and high temps, but no arsenic is required.\n\nAnother guy on the same program did the same thing by taking a carbon rod from a battery and hooking it up to 24VDC with two car batteries.  It heated it VERY quickly.  I am sorry I cannot remember the name of the program!!!!  It was using only 19th century technology to replicate settlers in Canada during the Yukon gold rush days.
91895
Water has the highest specific heat of any of the above-mentioned materials.
540800
I would use a length of nichrome wire (see links below) stretched between a couple copper blocks. You could make some sort of pinch block out of the copper and connect a power supply to the copper. (or drill a hole through it with a set screw, tap a hole and us a pan head screw)  You will have to insulate the copper from the rest of the world so you don't short something out.  G-10 (a glass/epoxy resin) makes a good moderately high temperature insulator.  One of the contacts should be fixed and the other allowed to "float" and allow for changes in the length of the wire due to heating.  A spring could be used to provide tension or an air cylinder.  The power supply will depend on the length and diameter wire you choose.  If there is a problem with the electrical contacts heating up, you could run some cooling water through them.  Just drill a hole through it and 1/8 NPT pipe tape both ends.  You can plumb some water to it and it will keep the copper chilled.
25718
I don't think you would have any problems just go slow  at the very end. The only thing you would have to worry about is the possibility of the salt turning brown with excess heat but salt is ionic and has a high melting point so I wouldn't worry.
487307
Specific heat is defined as the amount of energy required to raise the temperature of one unit of mass by one unit of temperature.  This is 0.89 per gram for Al and 0.45 per gram for iron, so evidently, to heat 500 g of aluminium required proportionally more energy than heating iron to the same temperature, and that is also the heat that can be given back. The density of the material has nothing to do with it, it only makes the iron block smaller than the aluminium one.
264363
Okay, I'll try this one -\n\nRun this experiment twice (or more times), each time with a piece of metal having different density.  The metal piece should be of adequate size (a sewing needle isn't going to do it), it needs to be big enough to significantly affect the temperature of the water.  You will need to know the mass of the metal (i.e., weigh it) and have a thermometer capable of reading from room temperature up through boiling or so.  Please note this is not going to give you a highly accurate answer, but can give you a ballpark idea (I'm guessing you're probably not doing this in a 500 million dollar lab).\n\nThe procedure:\n\n1)  Measure and record room temperature as T1.\n\n2)  Weigh the metal, call it M1.\n\n3)  Bring a known quantity of water (weigh it, or measure it and convert to weight, call it M2) to a temperature just short of boiling (say 180F to 200F, use the same temperature for each run of this experiment).  Record the temperature as T2, and remove the heat source (take it off the burner, etc.).\n\n4)  Drop in a metal piece at room temperature.  Allow a couple of minutes for heat to exchange.  Make sure you use \nthe same amount of time for each run of this experiment.\n\n5)  Measure and record the new temperature of the water as T3.\n\n6)  Repeat with your other metal samples.\n\nYou can now estimate the specific heat capacity for each metal.  It will not be super-accurate (heat escapes your system, and temperatures won't have completely equalized), but should give you some idea.  Just assume all temperatures did equalize and that no heat escaped for calculational purposes.\n\nSince (you are assuming) the heat which left the water went into the metal, then the product of mass, specific heat capacity, and temperature change should be the same for both the metal and the water (but in opposite directions).\n\nThis means that:\n\n(M1)(c1)(T3-T1) = (M2)(cw)(T2-T3)\n\nwhere c1 is the specific heat capacity of the metal, and cw is the specific heat capacity of water (look it up on Google to get the units you need).\n\nSolving this, you get:\n\n......(M2)(cw)(T2-T3)\nc1 = -----------------\n........(M1)(T3-T1)\n\n(sorry about the dots, I'm trying to keep everything aligned)\n\nRepeat the calculations for each of the metals.\n\nYou will need to calculate (or look up) the densities of each of the metals.  Then, graph density vs. the specific heat capacities you calculated, and see if your hypothesis is true.\n\nHave fun!
520288
Chemical\nAlloying is the process of "improving" a metal by adding another metal into it to make it a better conductor, stronger material, or whatever the aim is.\nAlloying requires high heating to bond the metals together (and to melt them in the first place), so unless you like your hand being burnt, you don't touch them. \nThe use of dirty pennies carries a greater risk of obtaining, and transfering diseases, so use clean ones. Also, overtime the surface of the alloy will still react with oxygen. Note then that a dirty penny can in fact last longer than a clean one (assuming the dirt does not react) as it has a layer of protection.
599459
since a "certain" soft metal on burning produces lime  lime cannot be an element . hence the answer is 'c'\nanswer : 'c'\n  note: the soft metal is calcium
551759
Reproduction detail\n1. use of finer sand, \n2. Hydrostatics of the molten metal \n3. same as in #2\n4.Hmmm?\n5.To avoid air voids :). \n6. Not enough water and the sand will crumble, too much water the medium will be too fluid or too much of steam will be produced during casting damaging the mold from inside out.
390765
First the specific heat of water is not needed because both items mixed are water and would have the same specific heat so just use the weight.\n\nso you have 60 * 80 + 40 * 25 = 100 * x    where x is the new temperature in degrees C\n\nIf the items being mixed were different then use the specific heat of each item to calculate the number of joules in each item which will give the total number of joules in the combined item.
15915
The formula for calculating specific heat is q=mC(T2-T1). Where q=heat exchange, m=mass, C=specific heat, T2=final temp, and T1=initial temp.\n\nSince you have two materials inside your container, your formula would be q=[mC(T2-T1)]for the water + [mC(T2-T1)] for the metal.\n\nThe container is insulated so there is no heat exchange between the outside environment and the materials in the container. So q=0.\n\nThe formula reduces to 0=[mC(T2-T1)]for the water + [mC(T2-T1)] for the metal. \n\nOr [mC(T2-T1)]for the water = -[mC(T2-T1)] for the metal\n\nC of metal= [mC(T2-T1)]for the water/[-m(T2-T1)]for the metal.\n\nC of metal= [(185g)(4.184 J/gK)(303.75K-298.15K)]/\n            [-(36g)(303.75K-451.15K)]\n\nC of metal = 7775.313J=7.775kJ
398067
when ever two dissimilar metals are joined  they produce a specific millivoltage at each degree of temperature\nif you graft the changes you will find a bell curve \nunique to each type \nthis is how you determine which is proper one for your use\ntype K alumel and cromel  is used at medium temperature ranges 90 to 1600 degrees F
593307
The problem with that is that water wil freeze below 32 farenheit. so it would need a eletric trace(heat trace to heat it up if temp goes below 32) and insulation to keep the heat in. Also, rusting is a major issue which is bound to happen even if the most rustfree material is used. Also leaks are a major issue. Something chemical has to be mixed with water to determine exact location of the leak if one takes place. the oil pipelines in middle east use a chemical, i forget the name, for the same reason. Adding and removing the compund from water may be a major pain. Also another major problem would be collecting the water, how exactly would that be done. Drainage water maybe, but it would be very very hard to collect pure rainfall and transport it. The idea may seem easy but it would involve major reconfiguration of water systems, water collectors, pipelines within existing eastern cities, etc to provide water to the west. Its just not economical to do so. Also pumping stations to clean water at each interval are also expensive to first build and then run.