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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

Stretch a rubber band while holding it gently to your lips. Then slowly let it relax while still in contact with your lips.

a. What happens to the temperature of the rubber band on stretching?

b. Is the stretching an exothermic or endothermic process?

c. Explain the above result in terms of intermolecular forces.

d. What is the sign of ∆S and ∆G for stretching the rubber hand?

e. Give the molecular explanation for the sign of ∆S for stretching.

(a)

Interpretation Introduction

Interpretation: The effect on temperature on the stretching of rubber band is to be stated and whether the stretching is an exothermic or endothermic process is to be explained in terms of intermolecular forces. Also, the sign of ΔS and ΔG for stretching the rubber band is to be stated with the molecular explanation for the sign of ΔS for stretching.

Concept introduction: Rubber is a polymer (long chain molecules) made from organic compound isoprene. The molecules in rubber are arranged in a tangled up position than an aligned position and due to thermal motion they lose their alignment and go back to their tangled state and this is called an elastic contact caused by an entropic force.

To determine: The effect on temperature on the stretching of rubber band.

Explanation

Explanation

The effect of temperature on the stretching of rubber band is explained.

At lower temperature the tension of the rubber band decreases and it does less work in contraction from a given stretc...

(b)

Interpretation Introduction

Interpretation: The effect on temperature on the stretching of rubber band is to be stated and whether the stretching is an exothermic or endothermic process is to be explained in terms of intermolecular forces. Also, the sign of ΔS and ΔG for stretching the rubber band is to be stated with the molecular explanation for the sign of ΔS for stretching.

Concept introduction: Rubber is a polymer (long chain molecules) made from organic compound isoprene. The molecules in rubber are arranged in a tangled up position than an aligned position and due to thermal motion they lose their alignment and go back to their tangled state and this is called an elastic contact caused by an entropic force.

To determine: The stretching is an exothermic or endothermic process.

(c)

Interpretation Introduction

Interpretation: The effect on temperature on the stretching of rubber band is to be stated and whether the stretching is an exothermic or endothermic process is to be explained in terms of intermolecular forces. Also, the sign of ΔS and ΔG for stretching the rubber band is to be stated with the molecular explanation for the sign of ΔS for stretching.

Concept introduction: Rubber is a polymer (long chain molecules) made from organic compound isoprene. The molecules in rubber are arranged in a tangled up position than an aligned position and due to thermal motion they lose their alignment and go back to their tangled state and this is called an elastic contact caused by an entropic force.

To determine: The above results in terms of intermolecular forces.

(d)

Interpretation Introduction

Interpretation: The effect on temperature on the stretching of rubber band is to be stated and whether the stretching is an exothermic or endothermic process is to be explained in terms of intermolecular forces. Also, the sign of ΔS and ΔG for stretching the rubber band is to be stated with the molecular explanation for the sign of ΔS for stretching.

Concept introduction: Rubber is a polymer (long chain molecules) made from organic compound isoprene. The molecules in rubber are arranged in a tangled up position than an aligned position and due to thermal motion they lose their alignment and go back to their tangled state and this is called an elastic contact caused by an entropic force.

To determine: The sign of ΔS and ΔG for stretching the rubber band.

(e)

Interpretation Introduction

Interpretation: The effect on temperature on the stretching of rubber band is to be stated and whether the stretching is an exothermic or endothermic process is to be explained in terms of intermolecular forces. Also, the sign of ΔS and ΔG for stretching the rubber band is to be stated with the molecular explanation for the sign of ΔS for stretching.

Concept introduction: Rubber is a polymer (long chain molecules) made from organic compound isoprene. The molecules in rubber are arranged in a tangled up position than an aligned position and due to thermal motion they lose their alignment and go back to their tangled state and this is called an elastic contact caused by an entropic force.

To determine: The molecular explanation for the sign of ΔS for stretching.

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