Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

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

Accepted Answer

hydrogen b

Question 3

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

Accepted Answer

dipole-dip

Question 4

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

Accepted Answer

Question 5

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

Accepted Answer

A) C2H6 
B) CH3OCH3 
C) NO2 
D) H2S 
E) CaNO3 
A) C2H6 
B) CH3OCH3 
C) NO2 
D) H2S 
E) CaNO3

Question 6

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.

Accepted Answer

A) 230 pm 
B) 328 pm 
C) 523 pm 
D) 656 pm 
E) 780 pm 
A) 230 pm 
B) 328 pm 
C) 523 pm 
D) 656 pm 
E) 780 pm

Question 7

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.

Accepted Answer

A) 3.081 g/cm3 
B) 1.023 g/cm3 
C) 4.091 g/cm3 
D) 2.046 g/cm3 
E) 2.032 g/cm3 
A) 3.081 g/cm3 
B) 1.023 g/cm3 
C) 4.091 g/cm3 
D) 2.046 g/cm3 
E) 2.032 g/cm3

Question 8

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

Accepted Answer

A) viscosity 
B) surface tension 
C) density 
D) specific heat 
E) triple point 
A) viscosity 
B) surface tension 
C) density 
D) specific heat 
E) triple point

Question 9

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

Accepted Answer

A) CH4 
B) O2 
C) CO2 
D) NH3 
E) Ne 
A) CH4 
B) O2 
C) CO2 
D) NH3 
E) Ne

Question 10

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

Accepted Answer

The answer of Indicate all the types of intermolecular forces...

Question 11

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

Accepted Answer

dipole-dip

Question 12

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?

Accepted Answer

Water is highly polar and poly

Question 13

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

Accepted Answer

A) 1. 
B) 2. 
C) 3. 
D) 4. 
E) 8. 
A) 1. 
B) 2. 
C) 3. 
D) 4. 
E) 8.

Question 14

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

Accepted Answer

Question 15

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

Accepted Answer

Question 16

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

Accepted Answer

The answer of Sodium iodide, NaI, melts at 651°C. In...

Question 17

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?

Accepted Answer

A) 42.7 kJ 
B) 49.5 kJ 
C) 179 kJ 
D) 1970 kJ 
E) 6840 kJ 
A) 42.7 kJ 
B) 49.5 kJ 
C) 179 kJ 
D) 1970 kJ 
E) 6840 kJ

Question 18

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

Accepted Answer

Question 19

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

Accepted Answer

A) Kr 
B) Br2 
C) S8 
D) Ca 
E) K 
A) Kr 
B) Br2 
C) S8 
D) Ca 
E) K

Question 20

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.)

Accepted Answer

A) 76.5°C 
B) 69.9°C 
C) 10.0°C 
D) 77.9°C 
E) 74.6°C 
A) 76.5°C 
B) 69.9°C 
C) 10.0°C 
D) 77.9°C 
E) 74.6°C

Exam 12: Intermolecular Forces and Liquids and Solids

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

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

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

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

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

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

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

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

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

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

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

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

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?

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

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

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.)

Introduction

Atoms, Molecules, and Ions

Stoichiometry

Reactions in Aqueous Solution

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

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

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

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

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

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?

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