Astudent made a copper bracelet by hammering a small copper bar into the desired shape. the bracelet has a mass of 30.1 grams and was at a temperature of 21°c in the classroom. after the student wore the bracelet, the bracelet reached a temperature of 33°c. later, the student removed the bracelet and placed it on a desk at home, where it cooled from 33°c to 19°c. the specific heat capacity of copper is 0.385 j/g•k.
69 explain, in terms of heat flow, the change in the temperature of the bracelet when the student wore the bracelet. [1]

70 determine the number of moles of copper in the bracelet. [1]

71 show a numerical setup for calculating the amount of heat released by the bracelet as it cooled on the desk. [1]

72 explain, in terms of chemical activity, why copper is a better choice than iron to make the bracelet. [1]