Chapter 5, Problem 5.8VP

(a)

Interpretation Introduction

Interpretation: The questions based on the given figures are to be stated.

Concept introduction: Exothermic process is a thermodynamic process in which energy is released on the completion of the process. Energy released either in the form of heat, light, sound or any other form. Enthalpy change $\left(\Delta H\right)$ is also a thermodynamic phenomenon which represents simply the energy change during the process. This enthalpy change may be positive, negative or zero. If heat is evolved from the system then the enthalpy change is negative and the process is known as exothermic. If heat is supplied to the system then the enthalpy change is positive and the process is known as endothermic. If energy change is zero then neither the process is exothermic nor the endothermic. Condensation is a phenomenon is which gaseous form of matter converts directly to the liquid and vice versa.

To determine: The exothermic processes from the process given in figure $\text{P5}\text{.8}$.

(b)

Interpretation Introduction

To determine: The processes which have positive $\Delta H$.

(c)

Interpretation Introduction

To determine: The processes in which system gains energy.

(d)

Interpretation Introduction

To determine: The processes in which surrounding loses energy.

(e)

Interpretation Introduction

To determine: The comparison between the flame of methane and propane in terms of kinetic energy and in terms of average speed.

(f)

Interpretation Introduction

To determine: The substance which does not have vibrational and rotational motion.