what is the reason for stirring the water after the heated metal is immersed in the calorimeter?
540865
this is so the water is heated evenly
81481
Hard to say without a picture or to see the process. Gas pressure? Wind? Contaminants in the metal? Wrong gas mixture?\nHere's a couple of links that may help..
675016
This is a calorimetry problem! There is an equation for it:       \nq = mc(change in temperature)\n\nq = the heat required \nm= mass\nc= specific heat \n\nAlso, write out the reaction and products.
25625
It Increases the melting. Try It to find out
1420
Good question.   Could be a number of reason, but my guess would be that you have some salt in your boiling water.    When NaCl solution is placed in a flame the Na cation gets ionized and yellow light is given off.    It doesn't take much salt for you to see this effect.   You will see this even with regular tap water, since it also has a small amount of salts dissolved in it.    \nIn fact, standard distilled water is usually not pure enough to avoid this effect.    That's why chemist buy special stills to make ultrapure water for experiments.
621304
If you are dealing with a reaction involving ammonium carbonate in solution, and are then measuring the temperature rise, you need the heat capacity of water, not ammonium carbonate!\n\nPlease post the whole problem if that is not enough to get you started.
762941
The change in heat = specific heat * mass * change in temperature (Q=C*g*ΔT).\n\nAssuming that the Aluminum also ends at 28.3 °C, then the change in heat for the Aluminum is\n\n0.0902 J/g°K * 35.7 g * (28.3°-81.9°)\n\nThe above will be negative as heat was lost from the Aluminum.  The change in heat for the water is\n\n4.184 J/g°K * 75.0 g * (28.3°-24.9°)\n\nThe above will be positive as the water gained heat.\n\nThe Heat Capacity of the calorimeter is the difference between the heat lost by the Aluminum and that gained by the water divided by the change in temperature (which is the same as for the water (28.3°-24.9°).
739985
the water is relesed as vapor from the liquid when the liquid is heated. Water changes phase and becomes gas, its called evaporation.
380685
1)Remember that a calories is a measure of the heat it takes \n  to raise 1 degree of the water temperature.\n2)A Calorimeter helps you measure among other thing the\nheat of fusion and since we know the heat of fusion of water its easier to calculate the heat of fusion of other things.
111874
Once something has already burned, it will not burn again. Water is the result of hydrogen burning.
841558
could be several reasons;\n\nif the material you're weighing is volatile and is evaporating you will find it impossible to get an accurate weight, further the fumes migh condense later at muck up the weighing mechanism,\n\nalso if the material contains solvent that is evaporating, or if its degrading by loss of gas or whatever you wont get an accurate reading\n\nI suppose that if the sample is hot it will conduct heat through the scale mechanism which might damage it - these instruments are very sensitive\n\nim sure there's lots of other reasons but these are the fiirst that come to mind\n\nhope this helps
48024
Your question doesn't make sense.  No metal would produce heat by being put in hot water--heat is only produced by a chemical change.  Perhaps sodium metal, which would conbust if the water had any oxygen in it, but it wouldn't need to even be hot water.  Also, water wouldn't be water at 400 degrees.
177751
The particles in the dish and salt will expand when heated, or condense when cooled.  In this case the mass after it cooled down should be smaller
797125
The heat lost by the warmer water will equal the heat gained by the cooler water.  The change in the heat will equal \nq = (s)(m)(T1 - T2)   where q is the heat change (units of Joules (J)), s is the specific heat of water (4.184 J/gK), m is the mass of the water in grams, and T1 and T2 are the initial and final temperatures of the water samples in Kelvin.  Assume the density of water = 1.00g/mL.\n\n(4.184J/gK)(30g)(Tf - 280K)  =  (4.184J/gK)(50g)(330K - Tf)\nTf is the final temperature of the combined solutions.\n\nSolving for Tf:\nTf = [50(330) + 30(280)] / 80  = 311K
1084334
The water bath is used to cool the solution to the needed temperature.  You set the beaker or flask in the bath.  Which is basically a pan of water.  The weighing boat is used to keep from putting the chemical directly on the balance. You will need to take the mass of the boat and then subtract this from the mass of the boat and the chemical to get the mass of the chemical.  The wire loop is usually platinum or nickel-chromium it is used to introduce chemicals into flame so that  the color produced can be observed.
790687
The burning of the fuel (chemical) caused the water to turn to steam (heat) which causes the piston to move the rod (mechanical) which moves the engine,\n\nIf you are looking for more in-depth,
236269
Because the atoms in heated water are farther apart.  It actually makes the water less dense.  It then becomes easier to freeze less dense liquid.