Question

Ming has two unknown substances. One is nonpolar, and the other is polar.
Which process would most likely help Ming identify the unknowns?
A.Test the boiling points. The polar substance should have a lower boiling point because of its dipole-dipole forces.
B.Test for an odor. The nonpolar substance should have a higher volatility and stronger odor because of its London dispersion forces.
C.Test the boiling points. The nonpolar substance should have a higher boiling point because of its hydrogen bonds.
D.Test for an odor. The polar substance should have a higher volatility and weaker odor because of its dipole-dipole forces.

Answer 1

Hello
We know that polar molecules' attraction is stronger than that of non polar ones; this can be a good basis for us to check the substances' polarity. Knowing that polar forces are stronger, we can eliminate all options referring to them as being the weaker force; that is, options C and A. Next, we know that stronger forces will result in lower volatility so we can eliminate option D. The answer is B, assuming the compound has an odor.

Answer 2

The answer is,

B. Test for an odor. The nonpolar substance should have a higher volatility and stronger odor because of its London dispersion forces.

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