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.

Question
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.)
Expand
Transcribed Image Text

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.
Expand
Transcribed Image Text

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.

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