The primary components of the antifreeze solution in your cars radiator is a 50%

Question

The primary components of the antifreeze solution in your cars radiator is a 50% by volume solution of ethylene glycol (HOCH_2CH_2OH, MM = 62.07 g/mole, density = 1/11 g/mL) and water. The density of the solution is 1.07 g/mL. ___The intermolecular force(s) present in ethylene glycol is(are) I. ion dipole II. London dispersion III. dipole dipole IV. Hydrogen bonding A) II B) III, IV C) II, III, IV D) I, II ___Ethylene glycol and water are miscible. This observation indicates the dominant intermolecular force in ethylene glycol is A) ion dipole B) London dispersion C) dipole dipole D) hydrogen bonding

Explanation / Answer

19) The intermolecular forces present in ethylene glycol are london dispersion, dipole dipole, and hydrogen bonding

answer=c) II,III,IV

20) answer=D) Hydrogen Bonding

Hydrogen bonding occurs when hydrogen is bound to a strongly electronegative element, O or F or N. The heteroatom polarizes electron density towards itself, and acquires a partial negative charge. Conversely, the hydrogen acquires a partial positive charge because the heteroatom has denuded it (slightly!) of electron density. This is, in a nutshell, the phenomenon of hydrogen bonding, which is responsible for the exceptionally high boiling points of OH2, and HF, and NH3.

Thus between molecules, there is an additional electrostatic interaction. The dipoles line up, positive to negative. Ethylene glycol, HOH2CCH2OH has two polar hydroxyl groups, and the dipoles line up from molecule to molecule. This constitutes a potent intermolecular force, which accounts for the high boiling point of ethylene glycol, 197.3 C, and also its viscosity.

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