Rank the following compounds according to the strength of their London (dispersi

Question

Rank the following compounds according to the strength of their London (dispersion) forces? weakest dispersion forces CF4 strongest dispersion forces BO middle dispersion forces PtBr2 Why do the strengths of London (dispersion) forces generally increase with increasing molecular size? Dispersion forces are all equal in magnitude; there is no size dependence. Dispersion forces arise from the attraction between the nuclei of atoms, and larger molecules have larger nuclei. Dispersion forces arise from dipoles caused by the electron distribution being distorted. Larger molecules have more electrons and, therefore, more distortions and a bigger force. Dispersion forces depend on distance. Larger molecules are farther apart and so the forces are smaller. Heavier atoms have stronger attractions for each other than lighter atoms.

Explanation / Answer

A)

london dispersion force depends mainly on TOTAL mass

so

CF4 = 88.0043 g/mol

BO = 26.81 g/mol

PtBr2 = 367 g/mol

Then, from the trende:

BO < CF4 < PtBr2

weakest to strongest

Question 2.

As the molecule increases more proton/electorns are presnet, therefore, more force interaction

a) False, they are not equal magnitud

b)false, nuclei interact with other species

c) TRUE

d) even though this might be true, this is not true entirely, since it also depends on charge/mass

e) this is the main basis, but no theoreitcal answer

best answer is C

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