Which of the following statements are true? Select all that apply. A. All other

ID: 579505 • Letter: W

Question

Which of the following statements are true? Select all that apply.

A. All other factors being the same, dispersion forces between linear molecules are greater than dispersion forces between molecules whose shapes are nearly spherical. B. For the halogens, the dispersion forces increase while the boiling points decrease as you go down the column in the periodic table from F2 to I2 . C. For molecules with varying molecular weights, the dispersion forces may not become stronger as the molecules become more polarizable. D. The smaller the atom, the less polarizable it is. E. In terms of the total attractive forces for a given substance, dipole-dipole interactions, when present, are always larger than dispersion forces.

Explanation / Answer

Solution

A). All other factors being the same, dispersion forces between linear molecules are greater than dispersion forces between molecules whose shapes are nearly spherical. (TRUE) This is because the London-dispersion forces between spherical molecules are smaller than those between more cylindrically shaped molecules.

B). For the halogens, the dispersion forces increase while the boiling points decrease as you go down the column in the periodic table from F2 to I2. (FALSE)

C). For molecules with varying molecular weights, the dispersion forces may not become stronger as the molecules become more polarizable. (TRUE).

D). The smaller the atom, the less polarizable it is. (TRUE) Because as the size decreases the electrons are more closely bound to the nucleus hence less polarizable.

E). In terms of the total attractive forces for a given substance, dipole-dipole interactions, when present, are always larger than dispersion forces. (TRUE). This is because Ionic bonds > H bonding > dipole-dipole interactions > dispersion forces.

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