Question 1

Examine the following phase diagram and determine what phase exists at point F.

Accepted Answer

A) vapor + liquid 
B) vapor 
C) liquid 
D) solid 
E) supercritical fluid 
A) vapor + liquid 
B) vapor 
C) liquid 
D) solid 
E) supercritical fluid

Question 2

Examine the phase diagram for the substance Bogusium (Bo)and select the correct statement.

Accepted Answer

A) Bo(s)has a lower density than Bo(l). 
B) The triple point for Bo is at a higher temperature than the melting point for Bo. 
C) Bo changes from a solid to a liquid as one follows the line from C to D. 
D) Bo changes from a liquid to a gas as one follows the line from C to D. 
E) Point B represents the critical temperature and pressure for Bo. 
A) Bo(s)has a lower density than Bo(l). 
B) The triple point for Bo is at a higher temperature than the melting point for Bo. 
C) Bo changes from a solid to a liquid as one follows the line from C to D. 
D) Bo changes from a liquid to a gas as one follows the line from C to D. 
E) Point B represents the critical temperature and pressure for Bo.

Question 3

The surface tension of water is lowered when a detergent is present in solution.

Accepted Answer

A) True 
 B)False

Question 4

Iron crystallizes in the body-centered cubic lattice.What is the coordination number for Fe?

Accepted Answer

A) 4 
B) 6 
C) 8 
D) 10 
E) 12 
A) 4 
B) 6 
C) 8 
D) 10 
E) 12

Question 5

A temperature increase causes __________________ in the conductivity of a conductor.

Accepted Answer

A) a decrease 
B) an increase 
C) an increase or decrease (depending on the conductor) 
D) a modulation 
E) no change 
A) a decrease 
B) an increase 
C) an increase or decrease (depending on the conductor) 
D) a modulation 
E) no change

Question 6

In cubic closest packing,the unit cell is body-centered cubic.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following terms refers to the resistance of a liquid to flow?

Accepted Answer

A) surface tension 
B) capillary action 
C) viscosity 
D) adhesion 
E) cohesion 
A) surface tension 
B) capillary action 
C) viscosity 
D) adhesion 
E) cohesion

Question 8

Chlorine trifluoride is used in processing nuclear reactor fuel.It has a vapor pressure of 29.1 torr at -47.0°C and its heat of vaporization is 30.61 kJ/mol.At what temperature would its vapor pressure be 107.7 torr?

Accepted Answer

The answer of Chlorine trifluoride is used in processing nuclear...

Question 9

How do the electrical properties of semiconductors differ from those of metals?

Accepted Answer

Metals are good conductors who

Question 10

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

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) e 
A) a 
B) b 
C) c 
D) d 
E) e

Question 11

Pentane,C5H12,boils at 35°C.Which of the following is true about kinetic energy,Ek,and potential energy,Ep,when liquid pentane at 35°C is compared with pentane vapor at 35°C?

Accepted Answer

A) Ek(g)k(l);Ep(g)$\approx$ Ep(l) 
B) Ek(g)> Ek(l);Ep(g) $\approx$ Ep(l) 
C) Ep(g)p(l);Ek(g) $\approx$ Ek(l) 
D) Ep(g)> Ep(l);Ek(g) $\approx$ Ek(l) 
E) Ep(g)$\approx$ Ep(l);Ek(g)$\approx$ Ek(l) 
A) Ek(g)k(l);Ep(g)$\approx$ Ep(l) 
B) Ek(g)> Ek(l);Ep(g) $\approx$ Ep(l) 
C) Ep(g)p(l);Ek(g) $\approx$ Ek(l) 
D) Ep(g)> Ep(l);Ek(g) $\approx$ Ek(l) 
E) Ep(g)$\approx$ Ep(l);Ek(g)$\approx$ Ek(l)

Question 12

The vapor pressure of 1-butene is 1.268 atm at 273.15 K and its heat of vaporization is 22.9 kJ/mol.What is the normal boiling point of 1-butene?

Accepted Answer

The answer of The vapor pressure of 1-butene is 1.268...

Question 13

Liquid ammonia boils at -33.4°C and has a heat of vaporization of 23.5 kJ/mol.Calculate its vapor pressure at -50.0°C.

Accepted Answer

The answer of Liquid ammonia boils at -33.4°C and has...

Question 14

Which of the following should have the lowest boiling point?

Accepted Answer

A) C5H12 
B) C6H14 
C) C8H18 
D) C10H22 
E) C12H26 
A) C5H12 
B) C6H14 
C) C8H18 
D) C10H22 
E) C12H26

Question 15

Octane is a component of fuel used in internal combustion engines.The dominant intermolecular forces in octane are

Accepted Answer

A) dipole-dipole forces. 
B) London dispersion forces. 
C) hydrogen bonding. 
D) covalent bonds. 
E) carbon-hydrogen bonds. 
A) dipole-dipole forces. 
B) London dispersion forces. 
C) hydrogen bonding. 
D) covalent bonds. 
E) carbon-hydrogen bonds.

Question 16

a.Explain what is meant by the term "unit cell".
b.Copper metal has a face-centered cubic unit cell.The edge length of the unit cell is 361 pm,and the atomic weight of copper is 63.55 amu.Calculate the density of the copper in g/cm3.
(1 amu = 1.661 $\times$ 10-24 g. )
c.From the data in (b),calculate the radius of a copper atom in pm.

Accepted Answer

a.A unit cell is the smallest repeating

Question 17

In hydrogen iodide __________________ are the most important intermolecular forces.

Accepted Answer

A) dipole-dipole forces 
B) London dispersion forces 
C) hydrogen bonding 
D) covalent bonds 
E) polar covalent bonds 
A) dipole-dipole forces 
B) London dispersion forces 
C) hydrogen bonding 
D) covalent bonds 
E) polar covalent bonds

Question 18

Mercury melts at -39°C and boils at 357°C.Draw a diagram of the heating curve of mercury.Label all lines and axes,and clearly indicate the melting and boiling points on your diagram.

Accepted Answer

The answer of Mercury melts at -39°C and boils at...

Question 19

Assuming that atoms are spherical,calculate the fraction of space which is occupied by atoms (i.e. ,the packing efficiency)in a metal with a face-centered cubic unit cell.

Accepted Answer

The answer of Assuming that atoms are spherical,calculate the fraction...

Question 20

Which of the following liquid substances would you expect to have the lowest surface tension?

Accepted Answer

A) Pb 
B) CH3OCH3 
C) HOCH2CH2OH 
D) H2O 
E) CH3CH2OH 
A) Pb 
B) CH3OCH3 
C) HOCH2CH2OH 
D) H2O 
E) CH3CH2OH

Exam 12: Intermolecular Forces: Liquids,solids,and Phase Changes

Examine the following phase diagram and determine what phase exists at point F.

Examine the phase diagram for the substance Bogusium (Bo)and select the correct statement.

The surface tension of water is lowered when a detergent is present in solution.

Iron crystallizes in the body-centered cubic lattice.What is the coordination number for Fe?

A temperature increase causes __________________ in the conductivity of a conductor.

In cubic closest packing,the unit cell is body-centered cubic.

Which of the following terms refers to the resistance of a liquid to flow?

Chlorine trifluoride is used in processing nuclear reactor fuel.It has a vapor pressure of 29.1 torr at -47.0°C and its heat of vaporization is 30.61 kJ/mol.At what temperature would its vapor pressure be 107.7 torr?

How do the electrical properties of semiconductors differ from those of metals?

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

Pentane,C5H12,boils at 35°C.Which of the following is true about kinetic energy,Ek,and potential energy,Ep,when liquid pentane at 35°C is compared with pentane vapor at 35°C?

The vapor pressure of 1-butene is 1.268 atm at 273.15 K and its heat of vaporization is 22.9 kJ/mol.What is the normal boiling point of 1-butene?

Liquid ammonia boils at -33.4°C and has a heat of vaporization of 23.5 kJ/mol.Calculate its vapor pressure at -50.0°C.

Which of the following should have the lowest boiling point?

Octane is a component of fuel used in internal combustion engines.The dominant intermolecular forces in octane are

In hydrogen iodide __________________ are the most important intermolecular forces.

Mercury melts at -39°C and boils at 357°C.Draw a diagram of the heating curve of mercury.Label all lines and axes,and clearly indicate the melting and boiling points on your diagram.

Assuming that atoms are spherical,calculate the fraction of space which is occupied by atoms (i.e. ,the packing efficiency)in a metal with a face-centered cubic unit cell.

Which of the following liquid substances would you expect to have the lowest surface tension?

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

The Properties of Solutions

The Main-Group Elements: Applying Principles of Bonding and Structure

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Pentane,C₅H₁₂,boils at 35°C.Which of the following is true about kinetic energy,E_k,and potential energy,E_p,when liquid pentane at 35°C is compared with pentane vapor at 35°C?