Question

1a. Identify which will be hotter (have a higher final temperature) if you heat equal masses of water and aluminum, each starting at room temperature with 1.0 kJ of electrical energy. Explain your groups answer.

1b. You are holding an Al rod in one hand and an Fe rod in another. The rods have the same mass and temperature (273 K). Assuming the rate of heat transfer is the same for both, identify which one will come to your body temperature first. Explain your group's answer.

1c. An acid-base neutralization reaction causes the temperature of a solution and beaker to rise from 23.00 degree C to 44.00 degree C. The volume of the solution is 435.0 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/ degree C.

Answer 1

1a

Final temperature after heating a material is dependent on its heat capacity. The one higher heat capacity will be having a lower temperature than another material with smaller heat capacity, if both materials have same mass and are given same amount of heat energy.

Here we have 2 materials. Water and aluminium.

Water have higher spcific heat capacity than aluminium.

So if 1 kJ is given to both (with same mass), aluminium will be having higher temperature and thus it will be hotter.

1b.

Here coming to body temperature means which one will be acquiring the higher temperature fast. The one with smaller heat capacity will be coming to body temperature first. Here iron have smaller specific heat than aluminium. So it will be acquiring body temperature first.

1c.