Miners discover a new vein of metal in the mine they are excavating. they send a sample to your lab so you can determine what type of metal it is. you heat up a 2 kg block of the unknown metal from room temperature of 298 k until it melts at 1768 k. you measure that it takes 1.24 x 10^6 j of energy to melt the block. use the specific heats of various metals shown below to determine what metal the miners have discovered. aluminum: 904 j kg-1 k-1 nickel: 445 j kg-1 k-1 copper: 384 j kg-1 k-1 cobalt: 421 j kg-1 k-1 titanium: 520 j kg-1 k-1 a. cobalt b. copper c. aluminum d. nickel

If two objects at different te,peraure are in contact with each other what happens to their temperature

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

The sum of the oxidation numbers in a neutral compound is always