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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