Calorimetry Principle - Practice Questions & MCQ

Principle of Calorimetry - 
Calorimetry means 'measurement of heat'.
When two bodies (both being liquid or one being solid and other liquid) at different temperatures are mixed or come in contact, heat will be transferred from a body at a higher temperature to a body at a lower temperature till both acquire the same temperature. The body at lower temperature absorbs heat while the body at higher temperature release it.

 The principle of calorimetry represents the law of conservation of heat energy.

The temperature of the mixture always lies between the temperature of the liquid having the lowest temperature and the temperature of the liquid having the highest temperature.

Mixing of two substances when temperature changes only: It means no phase change. Suppose two substances having masses
$m_1$ and $m_2$, gram specific heat C₁ and C₂ and temperature $\theta_1$ and $\theta_2$ then, 

Hence, Heat lost $=$ Heat gained

$$
\begin{aligned}
& \Rightarrow m_1 c_1\left(\theta_1-\theta_{\text {mix }}\right)=m_2 c_2\left(\theta_{\operatorname{mix}}-\theta_2\right) \\
& \theta_{\text {mix }}=\frac{m_1 c_1 \theta_1+m_2 c_2 \theta_2}{m_1 c_1+m_2 c_2}
\end{aligned}
$$
 

Similarly, we can derive formulas for different cases. The different cases and its result is mentioned in the table given below -