Of the two compounds SiF4 and SF4, which is polar and
which is n...

Question

Of the two compounds SiF4 and SF4, which is polar and 
which is nonpolar?

Accepted Answer

Hey everyone, we're asked to identify whether the compounds boron try fluoride and phosphorus try fluoride are polar or non polar. To answer this question, we need to draw out our lewis structures. Starting with boron try fluoride. We know that boron is in our group three A. So that gives us three valence electrons. Since we have one of boron, we're going to multiply three times one in order to get three. Looking at our flooring, we know that flooring is in our group seven a. So that gives us seven valence electrons. Since we have three of flooring, we're going to multiply seven times three in order to get 21. When we add these two values up, we get a total of 24 valence electrons. Now let's go ahead and draw out our lewis structure. So boron is going to be our central atom and it's going to be single bonded to three florins. In order to complete our 24 valence electrons. We need to draw three lone pairs surrounding each Florin. And as we can see right here, our geometry is going to be tribunal planer and boron can disobey the octet rule. So it is okay to have only three bonds connected to it. Looking at our lewis structures, we can go ahead and draw out our dipole moments and as we can see right here, we can see that our diaper moments are going to cancel out. So there is no net dipole moment, which means boron try fluoride is going to be non polar. Now let's go ahead and look at phosphorus try fluoride. We know that phosphorus is in our group five a so that gives us five valence electrons. Since we have one, we're going to multiply five times one to get five. Next looking at our flooring, we know that flooring is in our group 78 and we're going to multiply this by three. This gets us to a value of 21. Now, when we add these two values up, we get 26 valence electrons. Now let's go ahead and draw out our little structure. So phosphorus is going to be our central atom and this will be connected to three florins as well. Now when we fill up all the flooring dr Metz we find that we still need to add one lone pair and this lone pair is going to be on top of our phosphorus And this gets us to 26 valence electrons looking at our geometry, this is going to be tribunal para middle. Now let's go ahead and draw out our dipole moments. Now, when we draw our di pole moments, they will be going towards our florins since Lauren is more electro negative than phosphorus. And as we can see right here, none of our di pole moments cancel out. So we have a net dipole moment in phosphorus trifle ride. So phosphorus trifle ride is going to be considered polar. And these are going to be our final answers. Now, I hope that made sense. And let us know if you have any questions.

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