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Lewis Structures, Molecular Geometry, and Intermolecular Forces

Total questions: 40

Worksheet time: 24mins

Name
Class
Date
1.

How many total valence electrons are present in the Lewis structure of CO2?

a)

16

b)

20

c)

24

d)

32

2.

Which of the following molecules will have a Lewis structure with a double bond?

a)

O2

b)

H2O

c)

NH3

d)

CH4

3.

In drawing the Lewis structure for SF4 how many lone pairs of electrons are around the central sulfur atom?

a)

0

b)

1

c)

2

d)

3

4.

Which element typically does NOT follow the octet rule in its compounds?

a)

Carbon

b)

Oxygen

c)

Hydrogen

d)

Nitrogen

5.

How many valence electrons should be represented in the Lewis structure of ammonium ion NH4+?

a)

8

b)

9

c)

18

d)

20

6.

What is the molecular geometry of CH4, which Lewis structure is depicted in the picture?

a)

Tetrahedral

b)

Trigonal planar

c)

Linear

d)

Bent

7.

The molecule SF6 exhibits which type of molecular geometry?

a)

Octahedral

b)

Tetrahedral

c)

Trigonal bipyramidal

d)

Square planar

8.

What is the molecular geometry of water H2O?

a)

Linear

b)

Bent

c)

Tetrahedral

d)

Trigonal planar

9.

Which of the following molecules has a trigonal planar shape?

a)

BF3

b)

NH3

c)

CH4

d)

H2O

10.

In CO2 what is the shape around each carbon atom?

a)

Linear

b)

Bent

c)

Tetrahedral

d)

Trigonal planar

11.

Which type of intermolecular force is primarily responsible for the high boiling point of water?

a)

London dispersion forces

b)

Dipole-dipole interactions

c)

Hydrogen bonding

d)

Ionic bonding

12.

In the picture attached you have depicted the molecular shape of an I2 molecule. What type of intermolecular forces exist between I2 molecules in the solid phase?

a)

Hydrogen bonding

b)

Dipole-dipole interactions

c)

London dispersion forces

d)

Ionic bonding

13.

Which of the following molecules would exhibit dipole-dipole interactions?

a)

O2

b)

CO2

c)

HF

d)

N2

14.

In which of the following substances would you expect the weakest intermolecular forces?

a)

Ne

b)

MgCl2

c)

NH3

d)

H2O

15.

What is the predominant intermolecular force in a sample of CH3OH (methanol)?

a)

London dispersion forces

b)

Dipole-dipole interactions

c)

Hydrogen bonding

d)

Ionic bonding

16.

What is the main intermolecular force within a sample of pure Hydrofluoric acid HF, at liquid state?

a)

LDF's

b)

Dipole-dipole

c)

Hydrogen bond

d)

Dipole-induced dipole

17.

Choose the sentence that best describes the molecule of N2.

a)

There is a triple covalent bond between the Nitrogen atoms, and they are bonding to each other by means of dipole-induced dipole intermolecular force.

b)

There is strong covalent bond between the Nitrogen atoms, and they are bonding to each other by means of London Dispersion Forces intermolecular force.

c)

There is a weak intramolecular force between the Nitrogen atoms, and a very strong intermolecular force.

18.

True or false: "The CO2 molecule is a nonpolar molecule".

a)

TRUE

b)

FALSE

19.

Choose the sentence that best describes the O2 molecule.

a)

Intramolecular force is covalent bond and Intermolecular force is dipole-dipole.

b)

Intramolecular force is ionic bond and Intermolecular force is dipole-dipole.

c)

Intermolecular force is ionic bond and Intramolecular force is dipole-dipole.

d)

Intramolecular force is a double bond with 4 electrons being shared and Intermolecular force is London Dispersion Force.

20.

What type of intermolecular force is depicted in the picture attached?

a)

London Dispersion Forces

b)

Dipole- Dipole

c)

Dipole-Induced diploe

d)

Hydrogen bond

21.

Choose a sentence that is true.

a)

Fluorine atom in the BF3 molecule has an expanded octet.

b)

Boron octet in the BF3 molecule has 6 electrons only.

c)

The number of valence electrons in the molecule of BF3 is 22.

22.

TRUE or FALSE: " Compounds whit strong intermolecular forces have lower boiling points than those with weak intermolecular forces".

a)

TRUE

b)

FALSE

23.

What type of Intermolecular force is present among Cl2 molecules?

a)

London Dispersion forces

b)

Dipole-Dipole

c)

Ion-dipole

d)

Hydrogen bond

24.

What type of intermolecular force is depicted in the picture?

a)

Ion-dipole

b)

Ionic bond

c)

Dipole-dipole

d)

Ion-induced-dipole

25.

What type of Intermolecular force is holding the molecules of water to each other in the solid phase or in the liquid phase?

a)

Dipole-dipole

b)

London Dispersion Forces

c)

Hydrogen bond

d)

Covalent bond

26.

What type of intermolecular force is depicted in the picture?

a)

Ion-dipole

b)

Ion-induced dipole

c)

Ionic bond

d)

Covalent bond and ionic bond

27.

Choose the answer that best describes the interactions present in a sample of liquid Hydrochloric acid:

a)

The intramolecular force is dipole-dipole and the intermolecular force is dipole-induced dipole.

b)

The intramolecular force is covalent bond and the intermolecular force is ion-dipole.

c)

The intramolecular force is a single bond with 2 electrons being shared and the intermolecular force is hydrogen bond.

d)

The intramolecular force is a single bond with 2 electrons being shared and the intermolecular force is dipole-dipole.

28.

Which one of the following molecules would present a trigonal pyramidal molecular shape?

a)

CH4

b)

NH3

c)

NH4+

d)

BeH2

29.

What is the name of the molecular geometry depicted in the picture?

a)

Tetrahedral

b)

Trigonal planar

c)

Trigonal pyramid

d)

See saw

30.

Choose the sentence that best represents the SO2 molecule.

a)

SO2 has a bent molecular geometry with 2 bonding areas and 5 lone pairs of electrons around the central atom.

b)

SO2 has a trigonal planar molecular geometry with 2 bonding areas and 1 lone pairs of electrons around the central atom.

c)

SO2 has a bent molecular geometry with 2 bonding areas and 1 lone pairs of electrons around the central atom.

31.

TRUE or FALSE: "The molecule of water is bent"

a)

True

b)

False

32.

What is the molecular shape of the SeF4 molecule?

a)

Square planar

b)

See saw

c)

Square pyramidal

d)

T-shape

33.

What is the molecular geometry of the molecule of ClF3?

a)

T-shape

b)

See saw

c)

Trigonal planar

d)

Trigonal bypiramidal

34.

What is the name of the molecular geometry depicted in the picture?

a)

Tetrahedral

b)

Trigonal pyramidal

c)

T shape

d)

Square pyramidal

35.
Does HCl have hydrogen bonding?
a)
yes
b)
no
36.
What explains the very high melting and boiling point of water
a)
Strong dipole-dipole bonds between water molecules
b)
Strong hydrogen bonds between water molecules
c)
Dispersion forces which are present in all molecules
d)
Asymmetrical shape of the polar bonds.
37.
All molecules have London forces between them, but dipole-dipole and hydrogen bonding are so much stronger that when they are present we can ignore London forces.  Which of these has ONLY London forces?
a)
I2
b)
NH3
c)
OCl2
d)
SH2
38.

Which substance would have the weakest intermolecular forces of attraction?

a)

CH4

b)

NaCl

c)

H2O

d)

MgF2

39.

Intermolecular forces for: NH3

a)

Dispersion Force

b)

Dipole dipole

c)

Hydrogen bonding

40.

Which substance has the weakest intermolecular forces?

a)

Substance A, boiling point of 75 °C

b)

Substance B, boiling point of 105 °C

c)

Substance C, boiling point of 25 °C

d)

Substance d, boiling point of 45 °C

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