Principle of calorimetric experiments

Consider the principle of calorimetric experiments. Answer the question.

Calorimetry, or heat measurement, is a branch of physics that deals with the measurement of heat quantities. The specific heat of substances, heat of transfer, thermal effects of chemical reactions, calorific value of fuels etc. are determined calorimetrically. Calorimeters are used to measure amounts of heat. The amount of heat is found from the change in temperature of a certain amount of water or other liquid in the calorimeter, caused by the heat effect of the process being studied.

Calculator: amount of heat during heating and cooling of bodies

The calculator calculates the amount of heat required to heat bodies from a substance or the amount of heat released when they cool down, using the formula $Q = c m Δ t$ . When using the calculator, enter the data in the table. The answer appears in the last row of the table.

Specific heat $c$ of matter	$\frac{J}{^{\circ} C \cdot k g}$
Mass $m$	$k g$
Initial temperature $t_{1}^{\circ}$	$^{\circ} C$
Final temperature $t_{2}^{\circ}$	$^{\circ} C$
Temperature change $Δ t$	$^{\circ} C$
Internal energy change $Q = c m Δ t$	$J$ *

* A negative result indicates that the internal energy of the body decreased. A positive result indicates that the internal energy of the body increased.

The table shows the specific heats of several well-known substances.