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Exam 11: Intermolecular Forces and Liquids and Solids

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Question 61

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

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Question 62

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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. 400 mmHg @ 104°C, 500 mmHg @ 111°C, 600 mmHg @ 117°C, 700 mmHg @ 122°C, 760 mmHg @ 125°C

A) 125°C
B) 120°C
C) 115°C
D) 110°C
E) 105°C

F) A) and B)
G) A) and C)

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Question 63

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Given the following compound and its boiling point, identify whether it is polar or nonpolar: F₂, -188.1°C.

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

Boron nitride, BN₃, melts at approximately at 3,000°C under high pressure.This materal is almost as hard as diamond.What kind of crystal is this?

Krypton has a higher melting point than argon because of its

Identify the dominant (strongest)type of intermolecular force present in H₂S(g).

What phase exists at the point labeled c?

Indicate all the types of intermolecular forces of attraction in CHCl₃(l).

Which of the following properties indicates the presence of strong intermolecular forces in a liquid?

Calculate the amount of heat needed to melt 2.00 kg of iron at its melting point (1,809 K) , given that $\Delta$ H_fus = 13.80 kJ/mol.

Indicate all the types of intermolecular forces of attraction in SF₆(g).

A liquid boils when its

Which of the following would be expected to have the lowest vapor pressure at room temperature?

For which of the following species are the dispersion forces strongest?

Which one of the following substances crystallizes as a molecular solid?

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.)

The atomic planes in a graphite crystal are separated by 335 pm. At what angle would you find the first-order (n = 1) diffraction of 0.154 nm X-rays from a graphite crystal?

Which one of the following substances is expected to have the highest boiling point?

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