Identify the compounds that will have a net (nonzero) dipole moment. Justify your answer and show the direction of each.

(i) AsCl₅

(ii) Fluoromethane, CH₃F

(iii) SeCl₆

(iv) SF₂

Identify the polarity of each molecule.

i. H₂Se
ii. BI₃
iii. CH₃F
iv. NFCl₂

Identify the statement/s that explain why water is polar.

a. Oxygen is covalently bonded to two hydrogen molecules

b. Oxygen is more electronegative than Hydrogen and therefore pulls the electrons greater

c. Hydrogen and Oxygen are both highly electronegative. 

d. Hydrogen is more electronegative than Oxygen and therefore pulls the electrons greater

e. Electrons are not distributed uniformly between the Hydrogen and Oxygen atoms producing partial charges.

f.  There is a zero net dipole moment in molecule

Identify which statement/s describe or explain hydrogen bonding between H₂O molecules.

a. The partial negative charge of oxygen attracts the partial positive charge on hydrogen in another molecule. 

b. The partial negative charge of oxygen attracts the partial positive charge on hydrogen on the same molecule. 

c. Due to unequal sharing of electrons and bent structure, the H₂O  molecule is polar.

d. The hydrogen atoms in each water molecule attract each other making hydrogen bonds.

e. The positive charge of oxygen attracts the partial negative charge on hydrogen in another molecule. 

Arrange the compounds below in order of increasing strength of intermolecular forces

Br₂         

I₂          

NH(CH₃)₂

Identify the type of force involved in the situations below as either intermolecular or intramolecular

i. boiling of water

ii. the formation of H₂O in a fuel cell through the combination of H₂ and O₂

iii. vulcanization covalently bonds the rubber in tire

iv. coffee dissolves in water

v.  Liquid flowing in a narrow space due to capillary action

How are the following quantities affected by stronger intermolecular forces?

(a) vapor pressure
(b) boiling point

Identify the strongest intermolecular force present in each compound below:

a. CF₄        

b. CH₂Br₂     

c. HOCH₂OH

For each property below, Identify which compound would have the highest value for that property

a. molar heat of vaporization            

b. melting point

c. vapor pressure

d. viscosity         

Identify each of the following properties of liquids as it pertains to having either weak or strong intermolecular forces

i) low surface tension 

ii) high viscosity

iii) high boiling point

iv) low vapor pressure 

(i) Using the first two temperatures and vapor pressures in the table, calculate the ΔH_vap for benzene (C₆H₆) in kJ/mol. 

(ii) Plot the values in the table then determine the ΔH_vap for benzene (C₆H₆) in kJ/mol. 

(iii) Compare the values obtained using the two methods.

Calculate the temperature at which cyclooctane will boil at an external pressure of 565 torr. The heat of vaporization is 43.3 kJ/mol and the normal boiling point is 149 °C