why is CH2F2 considered polar?

Answer 1

The electronegativity of fluorine is 4.0, the highest known. So the C-F bonds are polar. Electronegativities of C and H are almost equal, so C-H bonds are almost nonpolar. The F-C-F bonds are on one side of the molecule, so the (-) charge of the F's is on that side. The C is slightly (+) in the center. The H-C-H bonds are on the other side with almost no separation of charge. So there is an overall separation of charge in the molecule, which means it's polar.

Answer 2

Some forms of clinical depression can be very severe it's true, it is just that out of the many many people who suffer from depression, the vast majority have it in a mild to moderate form and only a minority have it severely. Bi-Polar sufferers have both depression and mania, and are at a greater risk of harming themselves or others when they are in the 'manic' phase - did you see Eastenders on Friday? Stacey was experiencing the mania of bi-polar, when you are out of control and feel invincible and start acting rashly and often dangerously. Edit: Also, while people with depression may be a risk to themselves, those with Bi-Polar, Psychosis or Schizophrenia may be considered to be a risk to themselves and to other people.

Answer 3

The H and F molecule arrange themselves around the C molecule. The F molecules have a high electronegativity, so they will be able to pull the electrons of the C molecule towards them better. Therefore, the electrons will tend to stay at the side of the molecule with the F molecules, making that side negative. The other side will be positive. This creates one distinct positive and one distinct negative side, making the molecule polar.

Note:
Check out this picture of the molecule to understand........
http://srdata.nist.gov/cccbdb/images/C2vangles.gif

Answer 4

Because it is polar.