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ap chem

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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.
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 don't know

  • ap chem -

    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 -

    PF3 Triangular pryramid shape thus is not symmetric yet PF5 is symmetric thus the molecule is not polar

  • chem -

    what types of hybrid
    orbitals are involved in the bonding of the silicon atoms in silicon tetrafluoride,SiF4?

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