Chapter 10, Problem 60A

a.

Interpretation Introduction

Interpretation: Whether the combustion of gasoline in a car engine is an exothermic or endothermic process should be determined.

Concept Introduction: Endothermic and exothermic processes are defined on the basis of energy involved. The addition of energy is endothermic whereas loss of energy is exothermic.

Answer to Problem 60A

The combustion of gasoline in a car engine is an exothermic process.

Explanation of Solution

The combustion of gasoline in a car engine releases energy which is helpful in running the car engine. Since, the energy is released during the combustion of gasoline in a car engine from system to the surroundings so, it is an exothermic process.

b.

Interpretation Introduction

Interpretation: Whether the condensing of water in a cold pipe is an exothermic or endothermic process should be determined.

Concept Introduction: Endothermic and exothermic processes are defined on the basis of energy involved. The addition of energy is endothermic whereas loss of energy is exothermic.

Answer to Problem 60A

The condensing of water in a cold pipe is an exothermic process.

Explanation of Solution

The condensing of water in a cold pipe releases energy that is in condensation process, the water changes its phase from vapor to liquid by releasing energy. Since, the energy is released during condensing of water in a cold pipe from system to the surroundings so, it is an exothermic process.

c.

Interpretation Introduction

Interpretation: Whether ${\text{CO}}_{\text{2}}\text{(s) }\to {\text{ CO}}_{\text{2}}\text{(g)}$ is an exothermic or endothermic process should be determined.

Concept Introduction: Endothermic and exothermic processes are defined on the basis of energy involved. The addition of energy is endothermic whereas loss of energy is exothermic.

Answer to Problem 60A

  ${\text{CO}}_{\text{2}}\text{(s) }\to {\text{ CO}}_{\text{2}}\text{(g)}$ is an endothermic process.

Explanation of Solution

The conversion of ${\text{CO}}_{\text{2}}$ from solid phase to gaseous phase is possible when energy is added to the system. Since, the energy is utilized in conversion of ${\text{CO}}_{\text{2}}$ from solid phase to gaseous phase so, it is an endothermic process.

d.

Interpretation Introduction

Interpretation: Whether ${\text{F}}_{\text{2}}\text{(g) }\to \text{ 2F(g)}$ is an exothermic or endothermic process should be determined.

Concept Introduction: Endothermic and exothermic processes are defined on the basis of energy involved. The addition of energy is endothermic whereas loss of energy is exothermic.

Answer to Problem 60A

  ${\text{F}}_{\text{2}}\text{(g) }\to \text{ 2F(g)}$ is an endothermic process.

Explanation of Solution

The conversion of fluorine molecule to fluorine atoms is possible when energy is added to the system that is the energy required to break the bond between two $\text{F}$ atoms in ${\text{F}}_{\text{2}}$ molecule. Since, the energy is utilized in conversion of fluorine molecule to fluorine atoms so, it is an endothermic process.