Predict the shape and Lewis structure for CBr4.?

Answer 1

Carbon (C) has 4 valence electrons each.
Bromine (Br) has 7 valence electrons each, so 7*4= 28 VE
Total VE is therefore 32.

If you draw a lewis structure, and then a VESPR diagram, you see that its shape is TETRAHEDRAL.

.......Br
.........|
Br -- C -- Br (ignore the dots: lewis structure)
.........|
.......Br

note: unpaired electrons not shown on Brs

Answer 2

Cbr4 Lewis Structure

Answer 3

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Predict the shape and Lewis structure for CBr4.?

Answer 4

It is tetrahedral with the Carbon using sp^3 hybridized orbitals. It is hard to show the 3-D of tetrahedral, so check your text.

You arrive at this conclusion by looking at the 4 valance electrons of Carbon which lends itself very nicely to couple and bond with the unpaired valence electron of each of the 4 Bromines. In this formation, carbon and each of the bromines will have a stable octet in their outer(valence) shell.
Nice, eh?

The central atom carbon electrons are in different orbitals so it hybridizes in to four sp^3. Each bromine will have 3 lone pairs and carbon will have zero lone pair. Lone pairs are dots and bonds are lines per Lewis rules. Then, draw the four bonds just like in the previous answer. But remember this is not accurate because it should be 3-D. For the 2-d approximation of tetrahedral see your text.

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Answer 5

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A molecule can have polar bonds, but not be polar itself if the molecule is symmetrical because then then, instead of the most electronegative atom pulling all the electron over to one side polarizing the molecule there will be another atom of the same electronegativety which will exert the same pull on the electrons which will result in a balancing of pulls and the electrons will not tend to one side or the other, resulting in a non polar molecule. For example CO2 has polar bonds, but it's structure is symmetrical so it isn't a polar molecule, whereas, XeF2 has polar bonds and is a polar molecule because it is not symmetrical due to the nonbonding pairs of electron on the Xe atom. The water molecule is polar, and thus attracts other water molecules. To determine the polarity of a bond take the absolute value of the value that comes from the subtraction of the electronegativites of the atoms of the bond. Br2 is nonpolar. HBr is polar.

Answer 6

The Lewis structure shows a central carbon atom forming four single covalent bonds with the four terminal bromines. The central carbon has no lone pairs and four bonding pairs, so the molecular geometry is tetrahedral (as is the electron geometry), and bond angles are thus approximately 109.5 degrees. Each of the terminal bromines has, of course, three lone pairs of electrons. Consult your text, if necessary, for further details on tetrahedral geometry.

Answer 7

Cbr4 Molecular Geometry

Answer 8

A good rule of thumb: a molecule in which 4 things are bonded with a C atom will have a tetrahedral shape.