Question

Two aircraft rivets, one of iron and the other of copper, are placed in a calorimeter that has an initial temperature of 10°c. the data for the metals are as follows: iron copper mass(g) 39.0 13.0 initial t (°c) 0.0 100.0 c(j/g·k) 0.450 0.387 (a) will heat flow from fe to cu or from cu to fe? cu to fe fe to cu (b) to determine the actual final temperature, what must be known? the volume of the calorimeter the heat capacity of the calorimeter the density of the metals

Answer 1

a) Copper is at a higher temperature, so the flow of heat will take place from copper to iron. Heat is a form of energy, which always flows from higher temperature to lower temperature.  

b) To determine the actual final temperature, the heat capacity of the calorimeter must be known. A calorimeter constant refers to a constant, which quantifies the heat capacity of a calorimeter. It may be determined by using a known amount of heat to the calorimeter and measuring the corresponding change in temperature of the calorimeter.  

Answer 2

Answer:

(a) Cu to Fe

(b) heat capacity of the calorimeter

Explanation:

(a) Will heat flow from Fe to Cu or from Cu to Fe?

We need to consider the initial temperatures:

Cu 100.0°C

Fe 0.0 °C

Calorimeter 10 °C

Heat flows from bodies with higher temperatures to bodies with lower temperatures. So, heat will flow from Cu to Fe and to the calorimeter.

(b) To determine the actual final temperature, what must be known?

To determine the final temperature of the system, we need to know the amount of heat absorbed by the calorimeter (Qcal). We can calculate it using the following expression.

Qcal = C . ΔT

where,

C: heat capacity of the calorimeter

ΔT: change in the temperature

Thus, we need to know the heat capacity of the calorimeter.