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Chapter 12: Q12.64P (page 496)

Rank the compounds in Problem 12.62 in order of increasing viscosity at a given temperature; explain your ranking.

Short Answer

Expert verified

The increasing order of viscosity in the following compounds is as follows:

CH3CH3<CH2O<CH3OH.

Step by step solution

01

Viscosity

The viscosity of a fluid is the resistance to any movement experienced by the liquid molecules against any external force applied.

02

Bonding interactions

Considering the alcohols, there exist strong intermolecular H-bonding interactions which exert downward force, thus more viscosity. For simple hydrocarbons, there exists a weak intermolecular London dispersion force, thus exerting less viscosity. The aldehydes do not consist of strong H-bonding because of the absence of a polar H atom.

03

Effect on surface tension

Thus, considering the above explanation, the surface tension decreasing order isCH3CH3<CH2O<CH3OH.

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