Exam 11: Intermolecular Forces and the Physical Properties of Liquids and Solids

Octane has a vapor pressure of 40. torr at 45.1°C and 400. torr at 104.0°C. What is its heat of vaporization? (R = 8.314 J/K • mol)

Identify the dominant (strongest) type of intermolecular force present in RbCl(s).

Select the pair of substances in which the one with the higher vapor pressure at a given temperature is listed first.

Which are considered van der Waals forces?

The zincblende structure of ZnS has the relatively large sulfide ions arranged at the lattice points of a face-centered cubic structure. The edge length of this cubic unit cell is 540.9 pm. Determine the density of zincblende.

The surface tension of water is lowered when a detergent is present in solution.

In which of the following compounds will the molecules not form hydrogen bonds with each other?

a. Name the two unit cells which occur in close packing of identical atoms. b. Briefly explain how the two types of close-packed lattices of identical atoms differ, in terms of atomic arrangements.

Which one of the following involves ion-dipole interactions?

Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm³. What is the radius of a platinum atom?

Choose the response that lists the member of each of the following pairs that has the higher boiling point. I. H₂O or KI, II. HF or HI, III. Cl₂ or Br₂

Krypton has a higher melting point than argon because of its

Which one of the following substances does not exist in the indicated solid type?

At what temperature does ethanol boil on a day in the mountains when the barometric pressure is 547 mmHg? The heat of vaporization of ethanol is 39.3 kJ/mol and its normal boiling point is 78.3°C. (R = 8.314 J/K • mol)

The vapor pressure of ethanol is 400. mmHg at 63.5°C. Its molar heat of vaporization is 39.3 kJ/mol. What is the vapor pressure of ethanol, in mmHg, at 34.9°C? (R = 8.314 J/K • mol)

Which of the following atoms does not participate in hydrogen bonding?

Poor conductor of heat and electricity, soft, and low melting point are properties which describe a(n) ________ crystal.

Based on the phase diagram of a pure substance given below, what phase exists at point F?

Which of the following factors can contribute to the viscosity for a liquid?

Below is the phase diagram for sulfur. Which phase is present at 100°C and 1 atm?