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Determining polar or non polar: 4.27

Posted: Thu Nov 30, 2017 1:35 pm
by Michele Shi 1K
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

Re: Determining polar or non polar: 4.27

Posted: Thu Nov 30, 2017 9:29 pm
by Christine Wastila 1H
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.

Re: Determining polar or non polar: 4.27

Posted: Fri Dec 01, 2017 9:09 pm
by Aliza Ajmal 1D
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.