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Exam 11: Intermolecular Forces and Liquids and Solids

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Question 61

Multiple Choice

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Which one of the following substances will have both dispersion forces and dipole-dipole forces?

A) HCl
B) BCl₃
C) Br₂
D) H₂
E) CO₂

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

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Question 62

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Which of the following constants is/are needed to calculate the amount of energy required to heat 30.5g of H₂O(s) at -25.0°C to H₂O(l) at 55.0°C? $\Delta$ H_fus (H₂O) II. $\Delta$ H_vap (H₂O) III.specific heat of H₂O(s) IV.specific heat of H₂O(l) V.specific heat of H₂O(g)

A) I, II, III, IV, and IV
B) III and IV
C) I, II, III, and IV
D) I, III, and IV
E) I only

F) A) and B)
G) D) and E)

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Question 63

Multiple Choice

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The intermolecular forces present in C₆H₆ include which of the following? I.dipole-dipole II.ion-dipole III.dispersion IV.hydrogen bonding

Each of the following substances is a liquid at -50°C.Place these liquids in order of increasing vapor pressure: dimethyl ether (CH₃OCH₃) , propane (C₃H₈) , and ethanol (CH₃CH₂OH) _.

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.

Which would be expected to have the higher boiling point NH₃ or PH₃?

The boiling points of propanol (CH₃CH₂CH₂OH) and pentanol (CH₃CH₂CH₂CH₂CH₂OH) are 97°C and 137°C, respectively.The boiling point of butanol (CH₃CH₂CH₂CH₂OH) is predicted to be:

Suppose the atoms in a two-dimensional crystal have the following arrangement: What is the coordination number of each atom in this crystal?

Which one of the following substances should exhibit hydrogen bonding in the liquid state?

Which would have the stronger intermolecular forces of attraction H₂S or H₂Se?

Indicate all the types of intermolecular forces of attraction in C₂H₆(g).

HOCH₂CH₂OH(s) is classified as which of the following?

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

How much energy (heat) is required to convert 25.5 g of H₂O(l) at 35.0°C to H₂O(g) at 115.0°C?

Based on the phase diagram shown below, which is more dense: the liquid phase or the solid phase?

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

What phase exists at the point labeled c?

Of the given pair of substances at room temperature, which is more viscous? Honey or Mustard

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

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