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

One of the crystalline forms of zinc oxide is a structure where the oxygen atoms are at the lattice points in a face-centered cubic lattice. How many atoms are in each unit cell?

Octane is a liquid component of gasoline. Given the following vapor pressures of octane at various temperatures, estimate the boiling point of octane in Leadville, Colorado, where the atmospheric pressure is 496 mmHg. (R = 8.314 J/K • mol)

What is the name given for the attraction between unlike molecules involved in capillary action?

Polyethylene plastic consists of long chains of carbon atoms, each of which is also bonded to hydrogens as shown below: Water forms beads when placed on a polyethylene surface. Why?

If liquid bromine is cooled to form a solid, which type of solid does it form?

Which of the following is defined as the attractive forces between polar molecules?

What name is given to a quantitative measure of the elastic force in the surface of a liquid?

Vanadium crystallizes in a body-centered cubic lattice, and the length of the edge of a unit cell is 305 pm. What is the density of V?

How much energy (heat) is required to convert 52.0 g of ice at -10.0°C to steam at 100°C?

What is the intermolecular force that exists between a magnesium ion and hydrogen sulfide?

Which of the following pure substances has the strongest dispersion forces?

Octane, C₈H₁₈, boils at 125°C, whereas water boils at 100°C. This information suggests that the dispersion forces in nonpolar octane molecules are stronger than the dispersion forces and hydrogen bonding in water.

________ ________ are the attractions that hold particles together in condensed phases.

If a molecule at the surface of a liquid has enough kinetic energy to escape the liquid phase and enter the gas phase, then which of the following terms is used to describe this phenomenon?

Below is a representation of liquid water in equilibrium with its water vapor in a rigid container at 35ºC. The circles represent water vapor. Which diagram below best represents liquid water in equilibrium with its water vapor at 70ºC? The heat of vaporization of water is 40.7 kJ/mol. (R = 8.314 J/K • mol)

The triple point of iodine is at 0.12 atm and 115°C. Thus, liquid I₂

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

What is the attractive force between like molecules involved in capillary action?

Which would be expected to have the highest surface tension at room temperature?