Homework Help: ap chem

Posted by Emily on Tuesday, January 23, 2007 at 10:53pm.

consider the molecules PF3 and PF5.

b]is the PF3 molecule polar or is it nonpolar. explain

C] on the basis of bonding principles, predict whether each of the following compounds exists. In each case explain your prediction.
(i) NF5
(ii) AsF5

2. explain why the H-N-H bond angle is 107.5 degrees in NH3.

You need to tell me a little of what you think on these. The last question was a freebie but this one isn't.
hints:
for b, draw the Lewis electron dot structure for PF3 and that will tell you the shape. That will tell you if it is polar or non-polar.

For NF5 and AsF5, go through the Lewis dot structures.

i dont know

ap chem - Stephanie, Sunday, October 12, 2008 at 9:16am
b] PF3 is polar because it contains polar bonds and is not symmetrical

2. H-N-H bond angle is 107.5 because in space everything is three dimensional. If you looked at a three dimensional molecule of H-N-H, you would see that the angle is greater than 90 degrees. When measured it turns out to be about 107.5 degrees.
ap chem - Anonymous, Monday, October 20, 2008 at 6:31am
PF3 Triangular pryramid shape thus is not symmetric yet PF5 is symmetric thus the molecule is not polar
chem - Anonymous, Tuesday, October 27, 2009 at 4:59pm
what types of hybrid
orbitals are involved in the bonding of the silicon atoms in silicon tetrafluoride,SiF4?

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