1. Identify which will be hotter (have the higher final
temperature) if you heat equal masses of water and aluminum, starting at
room temperature, with 1 kJ of electrical energy. Explain.
2. You are holding an Al rod in one hand and a Fe rod,
which have the same mass and temperature (273 K), in the other. Assuming
the rate of heat transfer is the same for both, identify which one will
come to your body temperature first. Explain.
3. An acid-base neutralization reaction causes the temperature
of a solution and beaker to rise from 23 °C to 89 °C. The volume
of the solution is 435 mL. Determine the amount of energy released by this
reaction. Assume the specific heat of the solution, which is dilute, is
the same as that of water and that the beaker has a heat capacity of 330
J/°C.
4. An unknown piece of metal weighing 95 g is heated to
98°C. It is dropped into 250 g of water at 23°C. When equilibrium
is reached, the temperature of the water and piece of metal is 29°C.
Determine the specific heat of the metal. The heat capacity of the container,
a styrofoam cup, is negligible.