Vsepr practice problems PDF

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GENERAL CHEMISTRY VSEPR...

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VSEPR practice problems – ANSWER KEY –

1)

2)

3)



Draw the 2-D LEWIS structure below the molecular formula.



Determine both electron-domain (ED) and molecular geometry.



Determine whether bond angles are ideal (90 o, 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.) PF3

PF5

SF4

ED geometry:

tetrahedral

Molecular geometry:

trigonal pyramidal

Bond angles:

< 109.5

Angles distorted?

yes

Is the molecule polar?

yes

ED geometry:

trigonal bipyramidal

Molecular geometry:

trigonal bipyramidal

Bond angles:

90, 120

Angles distorted?

no

Is the molecule polar?

no

ED geometry:

trigonal bipyramidal

Molecular geometry:

see-saw

Bond angles:

< 90, < 120

Angles distorted?

yes

Is the molecule polar?

yes

4)

5)

6)

7)

8)

SF6

CH3+

ClO-

ClO2-

ClO3-

ED geometry:

octahedral

Molecular geometry:

octahedral

Bond angles:

90

Angles distorted?

no

Is the molecule polar?

no

ED geometry:

trigonal planar

Molecular geometry:

trigonal planar

Bond angles:

120

Angles distorted?

no

Is the molecule polar?

n/a

ED geometry:

linear

Molecular geometry:

linear

Bond angles:

n/a

Angles distorted?

n/a

Is the molecule polar?

n/a

ED geometry:

tetrahedral

Molecular geometry:

bent

Bond angles:

< 109.5

Angles distorted?

yes

Is the molecule polar?

n/a

ED geometry:

tetrahedral

Molecular geometry:

trigonal pyramidal

Bond angles:

< 109.5

Angles distorted?

yes

Is the molecule polar?

n/a

9)

10)

11)

12)

ClO4-

KrF2

XeF4

XeF6

You can skip this one.

13)

XeO3

ED geometry:

tetrahedral

Molecular geometry:

tetrahedral

Bond angles:

109.5

Angles distorted?

no

Is the molecule polar?

n/a

ED geometry:

trigonal bipyramidal

Molecular geometry:

linear

Bond angles:

180

Angles distorted?

no

Is the molecule polar?

no

ED geometry:

octahedral

Molecular geometry:

square planar

Bond angles:

90

Angles distorted?

no

Is the molecule polar?

no

ED geometry:

pentagonal bipyramidal

Molecular geometry:

fluctuating, distorted octahedral

Bond angles:

90

Angles distorted?

yes

Is the molecule polar?

no

ED geometry:

tetrahedral

Molecular geometry:

trigonal pyramidal

Bond angles:

< 109.5

Angles distorted?

yes

Is the molecule polar?

yes

14)

15)

16)

17)

18)

XeO2F2

CS2

NO3-

CO32-

BH3

ED geometry:

trigonal bipyramidal

Molecular geometry:

seesaw

Bond angles:

< 90, < 120

Angles distorted?

yes

Is the molecule polar?

yes

ED geometry:

linear

Molecular geometry:

linear

Bond angles:

180

Angles distorted?

no

Is the molecule polar?

no

ED geometry:

trigonal planar

Molecular geometry:

trigonal planar

Bond angles:

120

Angles distorted?

no

Is the molecule polar?

n/a

ED geometry:

trigonal planar

Molecular geometry:

trigonal planar

Bond angles:

120

Angles distorted?

no

Is the molecule polar?

n/a

ED geometry:

trigonal planar

Molecular geometry:

trigonal planar

Bond angles:

120

Angles distorted?

no

Is the molecule polar?

no

19)

20)

21)

22)

23)

XeF3+

BrF3

IF5

HCN

NH3Cl+

ED geometry:

trigonal bipyramidal

Molecular geometry:

T-shaped

Bond angles:

< 90, < 180

Angles distorted?

yes

Is the molecule polar?

n/a

ED geometry:

trigonal bipyramidal

Molecular geometry:

T-shaped

Bond angles:

< 90, < 180

Angles distorted?

yes

Is the molecule polar?

yes

ED geometry:

octahedral

Molecular geometry:

square planar

Bond angles:

< 90

Angles distorted?

yes

Is the molecule polar?

yes

ED geometry:

linear

Molecular geometry:

linear

Bond angles:

180

Angles distorted?

no

Is the molecule polar?

yes

ED geometry:

tetrahedral

Molecular geometry:

tetrahedral

Bond angles:

109.5

Angles distorted?

yes

Is the molecule polar?

n/a

24)

25)

26)

I3-

N3-

BHCl2

ED geometry:

trigonal bipyramidal

Molecular geometry:

linear

Bond angles:

180

Angles distorted?

no

Is the molecule polar?

n/a

ED geometry:

linear

Molecular geometry:

linear

Bond angles:

180

Angles distorted?

no

Is the molecule polar?

n/a

ED geometry:

trigonal planar

Molecular geometry:

trigonal planar

Bond angles:

120

Angles distorted?

yes

Is the molecule polar?

yes...