Workshop CHE 166
Answers for
Problem Set #10
 

1.

(a) 20, tetrahedral, bent
(b) 24, trigonal planar, trigonal planar
(c) 26, tetrahedral, trigonal pyramidal
(d) 8, tetrahedral, tetrahedral
(e) 26, tetrahedral, trigonal pyramidal
(f) 28, trigonal bipyramidal, T-shaped
(g) 20, tetrahedral, bent
(h) 22, trigonal bipyramidal, linear
(i) 34, trigonal bipyramidal, seesaw
(j) 26, tetrahedral, trigonal pyramidal
(k) 48, octahedral, octahedral

2. BF₃: 24 e^- , trigonal planar, trigonal planar; NF₃: 26 e^- , trigonal pyramidal, tetrahedral; ClF₃: 28 e^- , T-shaped, trigonal bipyramidal.

3.

(a) non-polar
(b) non-polar
(c) non-polar
(d)  polar
(e)  polar
(f) non-polar
(g)  polar
(h)  polar
(i)  polar
(j) non-polar

4. BeCl₂ has no non-bonded pairs and is linear while SCl₂ has two non-bonded pairs and is bent.

5.

(a) {free atom} ₅B:1s²2s²2p_x12p_y02p_z0 ® {excited atom} ₅B: 1s²2s¹2p_x12p_y12p_z0 ® {hybridized atom} ₅B: 1s²2(sp²)³2p_z0
(b) sp²
(c) yes, the 2p_z; at a right angle to the hybrid orbitals which are planar (trigonal)

6.

(a) sp³
(b) sp³
(c) sp²
(d) sp³d²
(e) sp³
(f) sp
(g) sp³

7. Hybridization of the carbon in methane is sp³ while that in formaldehyde is sp².

8.

(a) 2s , 2p
(b) 2s , 2p
(c) 4s , 0p
(d) 4s , 1p

9.

(a) dispersion, C₈H₁₈ (more electrons)
(b) dispersion and dipole, CH₃OCH₃ (greater dipole moment)
(c) dispersion and dipole, CH₃OH (H-bonding)
(d) dispersion and dipole, NH₂NH₂ (H-bonding)

10. CO has a dipole while N₂ does not.

11.

(a) HCl; larger dipole moment
(b) HI; larger number of electrons

12. Dispersion forces increase with the molar mass; the number of electrons determines the extent of the dispersion forces.

13.

(a) O₂, more electrons
(b) SiO₂, solid
(c) NaCl, ionic

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