PLEASE DON\'T JUST GUESS!!! Choose the compound below that contains at least one

Question

PLEASE DON'T JUST GUESS!!!

Choose the compound below that contains at least one polar covalent bond, but is nonpolar.

SeBr4

HCN

ICl3

CF4

Both B and C are nonpolar and contain a polar covalent bond.

Choose the molecule or compound that exhibits dipole-dipole forces as its strongest intermolecular force.

NH3

CF4

SO2

BCl3

H2

Place the following substances in order of decreasing boiling point.

H2O N2 CO

H2O > CO > N2

CO > N2 > H2O

CO > H2O > N2

N2 > CO > H2O

N2 > H2O > CO

Explanation / Answer

1) CF4

D is a non polar compound. C-F bond is a polar covalent bond as F's elecronegativity is higher than C.

2)

SO2 is the Dipole dipole force

3)

The way you determine the order for these three substances is by understanding the types of intermolecular forces that are possible for each molecule. First, all molecules have the weak intermolecular force called London dispersion forces or van der Waals forces that attract each other. Of all intermolecular forces this type of force is the weakest. The boiling points of compounds are determined by the strength of intermolecular forces that exist between the molecules of a liquid. These forces are also referred to as Induced Dipole-Induced Dipole Forces.

H2O has polar bonds, so dipolar forces would be present, but the most important intermolecular force for H2O is hydrogen bonding which is a strong interaction between H2O molecules.
CO has a polar bond because O is more electronegative than C. This means that dipole-dipole forces would exist between the CO molecules. These forces are also referred to as Dipole-Induced Dipole Forces.
N2 has no polar bond since both N atoms have the same electronegativity. Thus, N2 will only have van der Waals forces of attraction (Induced Dipole-Induced Dipole Forces) between N2 molecules.

The order of decreasing boiling point would be H2O>CO>N2

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