11.38 (a) Would you expect the viscosity of n-pentane, CH3CH2CH2CH2CH3, to be larger or smaller than the vis- cosity of n-hexane, CH3CH2CH2CH2CH2CH3? (b) Would you expect the viscosity of neopentane, (CH3)4C, to be smaller or larger than the viscosity of n-pentane? (See Fig- ure 11.6 to see the shapes of these molecules.) Linear molecule larger Surface area enhances intermolecular contact and increases dispersion force. n-Pentane (CsH12) 309.4 K bp Spherical molecule-smaller surface area diminishes intermolecular contact and decreases dispersion force. Neopentane (C5H12) bp = 282.7 K Figure 11.6 Molecular shape affects intermolecular attraction. Molecules of n-pentane make more contact with each other than do neopentane molecules. Thus, n-pentane has stronger intermolecular attractive forces and therefore a higher boiling point.

11.38 (a) Would you expect the viscosity of n-pentane, CH3CH2CH2CH2CH3, to be larger or smaller than the vis- cosity of n-hexane, CH3CH2CH2CH2CH2CH3? (b) Would you expect the viscosity of neopentane, (CH3)4C, to be smaller or larger than the viscosity of n-pentane? (See Fig- ure 11.6 to see the shapes of these molecules.) Linear molecule larger Surface area enhances intermolecular contact and increases dispersion force. n-Pentane (CsH12) 309.4 K bp Spherical molecule-smaller surface area diminishes intermolecular contact and decreases dispersion force. Neopentane (C5H12) bp = 282.7 K Figure 11.6 Molecular shape affects intermolecular attraction. Molecules of n-pentane make more contact with each other than do neopentane molecules. Thus, n-pentane has stronger intermolecular attractive forces and therefore a higher boiling point.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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(a) Would you expect the viscosity of n-pentane,CH3CH2CH2CH2CH3, to be larger or smaller than the viscosityof n-hexane, CH3CH2CH2CH2CH2CH3? (b) Wouldyou expect the viscosity of neopentane, (CH3)4C, to besmaller or larger than the viscosity of n-pentane? (See Figure11.6 to see the shapes of these molecules.)