VSEPR practice problems
VSEPR practice problems
– ANSWER KEY –
• Draw the 2-D LEWIS structure below the molecular formula.
• Determine both electron-domain (ED) and molecular geometry.
• Determine whether bond angles are ideal (90o, 109.5o, 120o, 180o) or distorted due to lone pair – bonding pair repulsion.
• From the overall molecular geometry and the presence and arrangement of polar bonds (if any), determine if a molecule is polar. (Polarity does not apply to polyatomic ions.)
1) PF3 ED geometry: tetrahedral
Molecular geometry: trigonal pyramidal
Bond angles: < 109.5
Angles distorted? yes
Is the molecule polar? yes
2) PF5 ED geometry: trigonal bipyramidal
Molecular geometry: trigonal bipyramidal
Bond angles: 90, 120
Angles distorted? no
Is the molecule polar? no
3) SF4 ED geometry: trigonal bipyramidal
Molecular geometry: see-saw
Bond angles: < 90, < 120
Angles distorted? yes
Is the molecule polar? yes
4) SF6 ED geometry: octahedral
Molecular geometry: octahedral
Bond angles: 90
Angles distorted? no
Is the molecule polar? no
5) CH3+ ED geometry: trigonal planar
Molecular geometry: trigonal planar
Bond angles: 120
Angles distorted? no
Is the molecule polar? n/a
6) ClO- ED geometry: linear
Molecular geometry: linear
Bond angles: n/a
Angles distorted? n/a
Is the molecule polar? n/a
7) ClO2- ED geometry: tetrahedral
Molecular geometry: bent
Bond angles: < 109.5
Angles distorted? yes
Is the molecule polar? n/a
8) ClO3- ED geometry: tetrahedral
Molecular geometry: trigonal pyramidal
Bond angles: < 109.5
Angles distorted? yes
Is the molecule polar? n/a
9) ClO4- ED geometry: tetrahedral
Molecular geometry: tetrahedral
Bond angles: 109.5
Angles distorted? no
Is the molecule polar? n/a
10) KrF2 ED geometry: trigonal bipyramidal
Molecular geometry: linear
Bond angles: 180
Angles distorted? no
Is the molecule polar? no
11) XeF4 ED geometry: octahedral
Molecular geometry: square planar
Bond angles: 90
Angles distorted? no
Is the molecule polar? no
12) XeF6 ED geometry: pentagonal bipyramidal
Molecular geometry: fluctuating, distorted octahedral
You can skip this one. Bond angles: 90
Angles distorted? yes
Is the molecule polar? no
13) XeO3 ED geometry: tetrahedral
Molecular geometry: trigonal pyramidal
Bond angles: < 109.5
Angles distorted? yes
Is the molecule polar? yes
14) XeO2F2 ED geometry: trigonal bipyramidal
Molecular geometry: seesaw
Bond angles: < 90, < 120
Angles distorted? yes
Is the molecule polar? yes
15) CS2 ED geometry: linear
Molecular geometry: linear
Bond angles: 180
Angles distorted? no
Is the molecule polar? no
16) NO3- ED geometry: trigonal planar
Molecular geometry: trigonal planar
Bond angles: 120
Angles distorted? no
Is the molecule polar? n/a
17) CO32- ED geometry: trigonal planar
Molecular geometry: trigonal planar
Bond angles: 120
Angles distorted? no
Is the molecule polar? n/a
18) BH3 ED geometry: trigonal planar
Molecular geometry: trigonal planar
Bond angles: 120
Angles distorted? no
Is the molecule polar? no
19) XeF3+ ED geometry: trigonal bipyramidal
Molecular geometry: T-shaped
Bond angles: < 90, < 180
Angles distorted? yes
Is the molecule polar? n/a
20) BrF3 ED geometry: trigonal bipyramidal
Molecular geometry: T-shaped
Bond angles: < 90, < 180
Angles distorted? yes
Is the molecule polar? yes
21) IF5 ED geometry: octahedral
Molecular geometry: square planar
Bond angles: < 90
Angles distorted? yes
Is the molecule polar? yes
22) HCN ED geometry: linear
Molecular geometry: linear
Bond angles: 180
Angles distorted? no
Is the molecule polar? yes
23) NH3Cl+ ED geometry: tetrahedral
Molecular geometry: tetrahedral
Bond angles: 109.5
Angles distorted? yes
Is the molecule polar? n/a
24) I3- ED geometry: trigonal bipyramidal
Molecular geometry: linear
Bond angles: 180
Angles distorted? no
Is the molecule polar? n/a
25) N3- ED geometry: linear
Molecular geometry: linear
Bond angles: 180
Angles distorted? no
Is the molecule polar? n/a
26) BHCl2 ED geometry: trigonal planar
Molecular geometry: trigonal planar
Bond angles: 120
Angles distorted? yes
Is the molecule polar? yes
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