Determining polar or non polar: 4.27

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Michele Shi 1K
Posts: 33
Joined: Thu Jul 27, 2017 3:00 am

Determining polar or non polar: 4.27

Postby Michele Shi 1K » Thu Nov 30, 2017 1:35 pm

Can someone explain the process on how to determine if these molecules are polar or non polar? The molecules in the problem are C5H5N, C2H6,CHCL3

Christine Wastila 1H
Posts: 61
Joined: Fri Sep 29, 2017 7:04 am

Re: Determining polar or non polar: 4.27

Postby Christine Wastila 1H » Thu Nov 30, 2017 9:29 pm

Look for sizable differences in electronegativity. For example, C-H bonds do not cause partial charges because there is not a large difference in electronegativity between C and H. However, a C-N bond or a C-Cl bond could cause polarity because N and Cl are more electronegative than C, causing a partial negative charge on those atoms and a partial positive charge on the C. Also, look at the structure to make sure the dipoles do not cancel. Therefore, C5H5N and CHCl3 are polar and C2H6 is nonpolar.

Aliza Ajmal 1D
Posts: 25
Joined: Fri Sep 29, 2017 7:05 am

Re: Determining polar or non polar: 4.27

Postby Aliza Ajmal 1D » Fri Dec 01, 2017 9:09 pm

Also, it's also important to note that a molecule can still have polar bonds and end up being nonpolar if the dipole moments cancel. Simply put: nonpolar molecules have no net dipole moments. Dipole moments cancel out due to symmetry. For example, if the molecule has a symmetrical shape like a tetrahedral shape then the dipole moments will cancel.


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