2) suppose you have equal masses of water and copper nails at the same temperatu

Question

2) suppose you have equal masses of water and copper nails at the same temperature. If you place both the water and the copper nails over identical flames for the same amount of time, would one material change temperature more than the other? If so which material would reach a higher temp, why? 4) Suppose you had cold feet when you went to bed and you wanted something to warm your feet. In the old days people would use a hot water bottle filled with hot water as opposed to any of the metal samples we studied today. Why? If on the other hand you had to choose one of the metal samples we studied today which would u choose? Why? samples used were iron, copper, aluminum and zinc

Explanation / Answer

1) The answer would depend on which compound absorbs more heat. To find out we must compare c (specific heat capacities). c for water = 4.19 J/g·C c for aluminum = 0.897 J/g·C Since water can absorb MORE energy per degree change, its temperature will rise more than the aluminum. If you also think about it in a real-life situation. If you boil water it's really hot, but if you put a piece of aluminum foil into a high-heat oven and take it out, it can be held without getting burned. 2) q = mc?t of iron + mc?t of water 4000000 J = (246 kg)(450 J/kg·C)(14 C - 40 C) + m(4186 J/kg·C)(14 C - 40 C) m = -63.19783895... kg Mass is never negative and considering significant digits, the mass is 6 x 10 kg. 3) Similar to the first question. Silver has a lower c. This means it will absorb less energy per degree change than copper. Therefore, if silver is put into 30 C water. It will absorb less energy from the water than copper to cool it down. As a result, copper ends up taking more energy out of the water than silver, making its water cooler (so the bad guy wins). 4) I do not know if there is a specific formula or way to deal with such a type of question. So this is my guess: When 5 + 22 is mixed, their average is 13.5 (almost 14). When 22 + 40 is mixed, their average is 31 (near 34.4). So I'd just take the average of 5 and 40. I get 22.5 C. So if the first and last liquids are mixed,

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