   Chapter 5, Problem 67GQ

Chapter
Section
Textbook Problem

For each of the following, define a system and its surroundings, and give the direction of energy transfer between system and surroundings.(a) Methane burns in a gas furnace in your home.(b) Water drops, sitting on your skin after a swim, evaporate.(c) Water, at 25 °C, is placed in the freezing compartment of a refrigerator, where it cools and eventually solidifies.(d) Aluminum and Fe2O3(s) are mixed in a flask sitting on a laboratory bench. A reaction occurs, and a large quantity of energy is evolved as heat.

(a)

Interpretation Introduction

Interpretation:

Define system and its surrounding and direction of energy transfer for the following reactions has to be identified

Concept Introduction:

System is the object or collection of object being studied.

1. 1. Surroundings include everything outside the system.
2. 2. The energy of the system decreases and the energy of the surrounding increase. In exothermic process qsys<0
3. 3. The energy of the system increases and the energy of the surrounding decrease. In endothermic process qsys>0
Explanation

The system is methane-system and the component of furnace is air-surroundings a...

(b)

Interpretation Introduction

Interpretation:

Define system and its surrounding and direction of energy transfer for the following reactions has to be identified

Concept Introduction:

System is the object or collection of object being studied.

1. 1. Surroundings include everything outside the system.
2. 2. The energy of the system decreases and the energy of the surrounding increase. In exothermic process qsys<0
3. 3. The energy of the system increases and the energy of the surrounding decrease. In endothermic process qsys>0

(c)

Interpretation Introduction

Interpretation:

Define system and its surrounding and direction of energy transfer for the following reactions has to be identified

Concept Introduction:

System is the object or collection of object being studied.

1. 1. Surroundings include everything outside the system.
2. 2. The energy of the system decreases and the energy of the surrounding increase. In exothermic process qsys<0
3. 3. The energy of the system increases and the energy of the surrounding decrease. In endothermic process qsys>0

(d)

Interpretation Introduction

Interpretation:

Define system and its surrounding and direction of energy transfer for the following reactions has to be identified

Concept Introduction:

System is the object or collection of object being studied.

1. 1. Surroundings include everything outside the system.
2. 2. The energy of the system decreases and the energy of the surrounding increase. In exothermic process qsys<0
3. 3. The energy of the system increases and the energy of the surrounding decrease. In endothermic process qsys>0

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