Chapter 10, Problem 61A

(a)

Interpretation Introduction

Interpretation: The combustion of gasoline in a car engine is exothermic or endothermic needs to be explained.

Concept Introduction: In an exothermic reaction energy discharges from the system while in endothermic reaction consumed energy from the surrounding. Chemical energy is the type of potential energy that stores energy in chemical bonds. Chemical energy is consumed when those bonds are created, and chemical energy is discharge when they split.

Answer to Problem 61A

Combustion of gasoline is exothermic process.

Explanation of Solution

Combustion is an exothermic reaction as it discharges heat. A large amount of heat is discharge during the combustion of gasoline in a car engine. In exothermic reaction, energy releases as heat and flows out of the system into the surroundings.

(b)

Interpretation Introduction

Interpretation: Water vapor condensing on a cold pipe exothermic or endothermic needs to be explained.

Concept Introduction: In an exothermic reaction energy discharges from the system while in endothermic reaction consumed energy from the surrounding. Chemical energy is the type of potential energy that stores energy in chemical bonds. Chemical energy is consumed when those bonds are created, and chemical energy is discharge when they split.

Answer to Problem 61A

Water vapor condensing on a cold pipe is exothermic.

Explanation of Solution

Water vapor condensing on a cold pipe an exothermic reaction as it discharges heat during the process. Water vapor discharge energy into the pipe and cools to the point that the vapor molecules transform into a liquid state.

(c)

Interpretation Introduction

Interpretation: ${\text{CO}}_{\text{2}}\left(\text{s}\right)\to {\text{CO}}_{\text{2}}\left(\text{g}\right)$ is exothermic or endothermic needs to be explained.

Concept Introduction: In an exothermic reaction energy discharges from the system while in endothermic reaction consumed energy from the surrounding. Chemical energy is the type of potential energy that stores energy in chemical bonds. Chemical energy is consumed when those bonds are created, and chemical energy is discharge when they split.

Answer to Problem 61A

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

Explanation of Solution

Conversion of solid ${\text{CO}}_{\text{2}}$ to ${\text{CO}}_{\text{2}}\left(\text{g}\right)$ is an endothermic reaction. This reaction absorbs heat from surrounding. In endothermic process energy as a heat flows into the system from surrounding.

(d)

Interpretation Introduction

Interpretation: ${\text{F}}_{\text{2}}\left(\text{g}\right)\to 2\text{F}\left(\text{g}\right)$ is exothermic or endothermic needs to be explained.

Concept Introduction: In an exothermic reaction energy discharges from the system while in endothermic reaction consumed energy from the surrounding. Chemical energy is the type of potential energy that stores energy in chemical bonds. Chemical energy is consumed when those bonds are created, and chemical energy is discharge when they split.

Answer to Problem 61A

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

Explanation of Solution

Conversion of ${\text{F}}_{\text{2}}\left(\text{g}\right)$ to $2\text{F}\left(\text{g}\right)$ is an endothermic process. This reaction absorbs heat from surrounding. In endothermic process energy as a heat flows into the system from surrounding.