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Exam 12: Intermolecular Forces and Liquids and Solids

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Question 41

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Sodium iodide, NaI, melts at 651°C. In its liquid state NaI conducts electricity. What kind of crystal is this?

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Question 42

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Which is expected to have a higher boiling point, C₈H₁₈ or C₄H₁₀?

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Question 43

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Identify the dominant (strongest)type of intermolecular force present in Cl₂(l).

Potassium bromide, KBr, crystallizes like NaCl in a face-centered lattice. The ionic radii of K⁺ and Br^- ions are 133 pm and 195 pm, respectively. Assuming that all Br^- ions are positioned in the face and corners of the unit cell, while the K⁺ ions are positioned along the edge alternating between anions, calculate the length of a unit cell edge.

Indicate all the types of intermolecular forces of attraction in He(l).

Find the temperature at which ethanol boils on a day in the mountains when the barometric pressure is 547 mmHg. (Given: The heat of vaporization of ethanol is 39.3 kJ/mol; the normal boiling point of ethanol is 78.3°C.)

Indicate all the types of intermolecular forces of attraction in HCl(g).

Indicate all the types of intermolecular forces of attraction in CF₄(g).

For which of the following species are the intermolecular interactions entirely due to dispersion forces?

The number of atoms in a face-centered cubic unit cell is

Indicate all the types of intermolecular forces of attraction in F₂(l).

Which of the following gases would have the highest critical temperature?

Which property of water allows a razor blade to float on it without sinking?

Indicate all the types of intermolecular forces of attraction in HF(l).

The specific heat of liquid ethanol, C₂H₅OH(l) , is 2.46 J/g·°C and the heat of vaporization is 39.3 kJ/mol. The boiling point of ethanol is 78.3 °C. What amount of enthalpy is required to heat 50.0 g of liquid ethanol from 23.0 °C to ethanol vapor at 78.3 °C?

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.

Indicate all the types of intermolecular forces of attraction in SF₄(g).

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?

The fact that the density of ice is less than the density of liquid water is due to the formation of hydrogen bonds.

Which one of the following elements would have the lowest melting point?