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Problem 13c
(c) Is XeF2 linear
Problem 14a
(a) Boron trichloride 1BCl32 and the carbonate ion 1CO3 2- 2 are both described as trigonal. What does this indicate about their bond angles?
Problem 14b
(b) The PCl3 molecule is trigonal pyramidal, while ICl3 is T-shaped. Which of these molecules is flat?
- How does a trigonal pyramid differ from a tetrahedron so far as molecular geometry is concerned?
Problem 15
Problem 16
Describe the bond angles to be found in each of the following molecular structures: (a) trigonal planar, (b) tetrahedral, (c) octahedral, (d) linear.
Problem 17a,c
(a) An AB6 molecule has no lone pairs of electrons on the A atom. What is its molecular geometry? (c) For the AB4 molecule in part (b), predict the molecular geometry.
Problem 17b
(b) An AB4 molecule has two lone pairs of electrons on the A atom (in addition to the four B atoms). What is the electron-domain geometry around the A atom?
Problem 18
Would you expect the nonbonding electron-pair domain in NCl3 to be greater or smaller in size than the corresponding one in PCl3?
- In which of these molecules or ions does the presence of nonbonding electron pairs produce an effect on the molecular shape? (a) CO2, (b) CH2Br2, (c) OF2, (d) BCl3, (e) SF6.
Problem 19
Problem 20
In which of the following molecules can you confidently predict the bond angles about the central atom, and for which would you be a bit uncertain? Explain in each case. (a) H2S, (b) BCl3, (c) CH3I, (d) CBr4, (e) TeBr4.
Problem 21a,c,d
How many nonbonding electron pairs are there in each of the following molecules: (a) (CH3)2S (c) BF3 (d) SO2
Problem 21b
How many nonbonding electron pairs are there in each of the following molecules: (b) HCN
Problem 21b
How many nonbonding electron pairs are there in each of the following molecules: (b) HCN
- How many electron domains are surrounding the central atoms which adopt the following geometries? (d) trigonal bipyramidal.
Problem 22
- Give the electron-domain and molecular geometries of a molecule that has the following electron domains on its central atom: (a) four bonding domains and no nonbonding domains (b) three bonding domains and two nonbonding domains (c) five bonding domains and one nonbonding domain (d) four bonding domains and two nonbonding domains.
Problem 23
- What are the electron-domain and molecular geometries of a molecule that has the following electron domains on its central atom? (a) Three bonding domains and no nonbonding domains (b) Three bonding domains and one nonbonding domain (c) Two bonding domains and two nonbonding domains.
Problem 24
Problem 25a
Give the electron-domain and molecular geometries for the following molecules and ions: (a) BeF2
Problem 25b,c,d,e,f
Give the electron-domain and molecular geometries for the following molecules and ions: (b) AsCl5 (c) NO2- (d) CS2 (e) SF4 (f) BrF5
Problem 26
Draw the Lewis structure for each of the following molecules or ions, and predict their electron-domain and molecular geometries: (a) AsF3 (b) CH3+ (c) BrF3 (d) ClO3- (e) XeF2 (f) BrO2-
Problem 28a1
The figure that follows contains ball-and-stick drawings of three possible shapes of an AF4 molecule. (a) For each shape, give the electron-domain geometry on which the molecular geometry is based. i.
Problem 28a3
The figure that follows contains ball-and-stick drawings of three possible shapes of an AF4 molecule. (a) For each shape, give the electron-domain geometry on which the molecular geometry is based. iii.
Problem 28a2
The figure that follows contains ball-and-stick drawings of three possible shapes of an AF4 molecule. (a) For each shape, give the electron-domain geometry on which the molecular geometry is based. ii.
Problem 28c
The figure that follows contains ball-and-stick drawings of three possible shapes of an AF4 molecule. (c) Which of the following elements will lead to an AF4 molecule with the shape in (iii): Be, C, S, Se, Si, Xe? i.
ii.
iii.
Problem 29a
Give the approximate values for the indicated bond angles in the following molecules: (a)
Problem 29c
Give the approximate values for the indicated bond angles in the following molecules: (c)
Problem 30a
Give the approximate values for the indicated bond angles in the following molecules: (a)
Problem 30d
Give the approximate values for the indicated bond angles in the following molecules: (d)
Problem 31
Ammonia, NH3, reacts with incredibly strong bases to produce the amide ion, NH2-. Ammonia can also react with acids to produce the ammonium ion, NH4+. (a) Which species (amide ion, ammonia, or ammonium ion) has the largest H¬N¬H bond angle? (b) Which species has the smallest H¬N¬H bond angle?
- In which of the following AFn molecules or ions is there more than one F-A-F bond angle: PF6⁻, SbF5, SF4?
Problem 32
Problem 33a
(a) Explain why BrF4- is square planar, whereas BF4- is tetrahedral.