Polarity

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Jarrett Peyrefitte 2K
Posts: 102
Joined: Sat Aug 24, 2019 12:16 am

Polarity

Postby Jarrett Peyrefitte 2K » Thu Nov 14, 2019 5:57 pm

How are you able to tell if a molecule is polar or nonpolar?

Justin Seok 2A
Posts: 104
Joined: Sat Aug 24, 2019 12:15 am

Re: Polarity

Postby Justin Seok 2A » Thu Nov 14, 2019 7:01 pm

From my understanding, polarity occurs when the electrons of a molecule aren't distributed equally. An easy way to figure out whether a molecule is polar is to see if its shape is non-symmetric, so H20 would be polar since it is a bent molecule, while BeCl2 is nonpolar since it is a linear molecule.

Brittney Hun 2C
Posts: 104
Joined: Wed Sep 11, 2019 12:15 am

Re: Polarity

Postby Brittney Hun 2C » Fri Nov 15, 2019 11:51 am

A polar molecule must have polar bonds with dipoles that do not cancel each other out. So the electronegativity of atoms must be evident and typically on the same side of the central atom. Draw a lewis structure and then determine its molecular shape. It is determined the symmetry of the molecule (lone pairs).

405335722
Posts: 56
Joined: Fri Aug 30, 2019 12:16 am

Re: Polarity

Postby 405335722 » Fri Nov 15, 2019 11:54 am

If all atoms around the central atom are the same, equally distributed, and there are no lone pairs then it is nonpolar.

jisulee1C
Posts: 149
Joined: Thu Jul 25, 2019 12:17 am

Re: Polarity

Postby jisulee1C » Fri Nov 15, 2019 12:18 pm

A nonpolar molecule will only have Van Der Waals forces because they all have the same pull for electrons (electronegativity) while polar molecules have dipole forces because the two atoms have a difference in electronegativity that’s makes KWon atom pull them electron more than the other atom.

Jessica Tran_3K
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

Re: Polarity

Postby Jessica Tran_3K » Fri Nov 15, 2019 12:23 pm

Another way to determine polarity that might be helpful would be to imagine strings on the ends of the atom. If you pull on the strings and there's a stronger pull on one end of the molecule compared to the other, then the molecule is polar. The same goes vice versa (equal pull all around = nonpolar molecule).

Kurtis Liang 3I
Posts: 50
Joined: Sat Aug 24, 2019 12:17 am

Re: Polarity

Postby Kurtis Liang 3I » Fri Nov 15, 2019 12:26 pm

To determine polarity, measure the electronegativity of all the atoms in the molecule. If there is an uneven distribution of electronegativity (more electronegativity to one side of the atom), there will be a dipole moment, causing the molecule to be polar.


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