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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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Most popular questions from this chapter

The repeat unit in a polystyrene coffee cup has the formula C6H5CHCH2.If the molar mass of the polymer is3.5脳105g/mole g/mole, what is the degree of polymerization?

Distinguish between isotropic and anisotropic substances. To which category do liquid crystals belong?

What factor(s) influence the viscosity of a polymer solution? What factor(s) influence the viscosity of a molten polymer? What is a polymer glass?

Which member in each pair of liquids has the lower vapour pressure at a given temperature? Explain.

(a) HOCH2CH2OHorCH3CH2CH2OH

(b) CH3COOHorCH32C=O

(c) HF or HCl

What is the strongest inter-particle force in each substance?

(a) H3PO4 (b) SO2 (c)MgCl2
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