Question 1

A supercritical fluid has a density that

Accepted Answer

A)  is lower than a liquid. 
B)  is lower than a gas. 
C)  is higher than a liquid. 
D)  is higher than a gas. 
E)  can be varied from gas-like to liquid-like. 
A)  is lower than a liquid. 
B)  is lower than a gas. 
C)  is higher than a liquid. 
D)  is higher than a gas. 
E)  can be varied from gas-like to liquid-like.

Question 2

Which do you think will have the highest surface tension?

Accepted Answer

A)  water 
B)  liquid N2 
C)  CCl4 
D)  CHCl3 
E)  molten NaCl 
A)  water 
B)  liquid N2 
C)  CCl4 
D)  CHCl3 
E)  molten NaCl

Question 3

The triple point of a compound is at 38.2°C and a pressure of 0.75 atm. A gaseous sample of the substance is held at a constant pressure of 0.79 atm. Initially the sample is at 50°C and is slowly cooled until it is -25°C. What if any phase transitions occur?

Accepted Answer

A)  condensation 
B)  deposition 
C)  condensation followed by freezing 
D)  simultaneous condensation and freezing 
E)  none of the above 
A)  condensation 
B)  deposition 
C)  condensation followed by freezing 
D)  simultaneous condensation and freezing 
E)  none of the above

Question 4

Which do you think has a higher boiling point, n-butanol or tert-butanol?

Accepted Answer

A)  n-butanol because it forms stronger hydrogen bonds. 
B)  tert-butanol because it forms stronger hydrogen bonds. 
C)  n-butanol because the linear molecule allows for greater dispersion forces. 
D)  tert-butanol because the tetrahedral molecule allows for greater dispersion forces. 
E)  they will be exactly the same. 
A)  n-butanol because it forms stronger hydrogen bonds. 
B)  tert-butanol because it forms stronger hydrogen bonds. 
C)  n-butanol because the linear molecule allows for greater dispersion forces. 
D)  tert-butanol because the tetrahedral molecule allows for greater dispersion forces. 
E)  they will be exactly the same.

Question 5

Generally if a liquid has stronger intermolecular attractions it will have

Accepted Answer

A)  a higher viscosity. 
B)  a higher vapor pressure. 
C)  a higher boiling point. 
D)  a & b 
E)  b & c
F) a & c
G) all of the above 
A)  a higher viscosity. 
B)  a higher vapor pressure. 
C)  a higher boiling point. 
D)  a & b 
E)  b & c
F) a & c
G) all of the above

Question 6

What types of intermolecular forces would you expect to find in CHCl3?

Accepted Answer

A)  dispersion 
B)  dipole-dipole 
C)  hydrogen bonding 
D)  a & b 
E)  all of the above 
A)  dispersion 
B)  dipole-dipole 
C)  hydrogen bonding 
D)  a & b 
E)  all of the above

Question 7

The process of a solid converting directly to a gas is called

Accepted Answer

A)  evaporation 
B)  condensation 
C)  deposition 
D)  sublimation 
E)  transformation 
A)  evaporation 
B)  condensation 
C)  deposition 
D)  sublimation 
E)  transformation

Question 8

At the triple point

Accepted Answer

A)  solid, liquid, and gas are all in equilibrium. 
B)  the vapor pressure of the solid is equal to the vapor pressure of the liquid. 
C)  the rate of sublimation is equal to the rate of evaporation. 
D)  a & b 
E)  all of the above 
A)  solid, liquid, and gas are all in equilibrium. 
B)  the vapor pressure of the solid is equal to the vapor pressure of the liquid. 
C)  the rate of sublimation is equal to the rate of evaporation. 
D)  a & b 
E)  all of the above

Question 9

In the phase diagram of water increasing pressure leads to lower melting temperatures.

Accepted Answer

A)  this is true for all compounds 
B)  this is true for all polar compounds 
C)  this is true for all hydrogen bonding compounds 
D)  this is true for compounds with solid phases that are less dense than their liquid phases 
E)  this is true only for H2O, HF, and NH3 
A)  this is true for all compounds 
B)  this is true for all polar compounds 
C)  this is true for all hydrogen bonding compounds 
D)  this is true for compounds with solid phases that are less dense than their liquid phases 
E)  this is true only for H2O, HF, and NH3

Question 10

Which do you predict will have the largest intermolecular attraction F2, Cl2, Br2, I2?

Accepted Answer

A)  F2 
B)  Cl2 
C)  Br2 
D)  I2 
E)  they will all be the same 
A)  F2 
B)  Cl2 
C)  Br2 
D)  I2 
E)  they will all be the same

Question 11

Dipole-dipole forces are

Accepted Answer

A)  larger than ion-ion forces. 
B)  about the same as all ion-ion forces. 
C)  much smaller than ion-ion forces. 
D)  between the force for °1 ions and °2 ions. 
E)  about a factor of two smaller the attraction of °1 ions. 
A)  larger than ion-ion forces. 
B)  about the same as all ion-ion forces. 
C)  much smaller than ion-ion forces. 
D)  between the force for °1 ions and °2 ions. 
E)  about a factor of two smaller the attraction of °1 ions.

Question 12

Which has the highest vapor pressure at room temperature?

Accepted Answer

A)  methanol 
B)  ethanol 
C)  propanol 
D)  butanol 
E)  there is no way to predict 
A)  methanol 
B)  ethanol 
C)  propanol 
D)  butanol 
E)  there is no way to predict

Question 13

At 20°C water has a vapor pressure of 0.0231 atm. If you bubble air through a container of water and collect 1 L of it at a total pressure of 1 atm, how many grams of water are in your sample of air (you can assume it is saturated)?

Accepted Answer

A)  9.6×10-4 
B)  3.0×10-4 
C)  3.0×10-3 
D)  1.1×10-2 
E)  1.7×10-2 
A)  9.6×10-4 
B)  3.0×10-4 
C)  3.0×10-3 
D)  1.1×10-2 
E)  1.7×10-2

A supercritical fluid has a density that

Which do you think will have the highest surface tension?

The triple point of a compound is at 38.2°C and a pressure of 0.75 atm. A gaseous sample of the substance is held at a constant pressure of 0.79 atm. Initially the sample is at 50°C and is slowly cooled until it is -25°C. What if any phase transitions occur?

Which do you think has a higher boiling point, n-butanol or tert-butanol?

Generally if a liquid has stronger intermolecular attractions it will have

What types of intermolecular forces would you expect to find in CHCl₃?

The process of a solid converting directly to a gas is called

At the triple point

In the phase diagram of water increasing pressure leads to lower melting temperatures.

Which do you predict will have the largest intermolecular attraction F₂, Cl₂, Br₂, I₂?

Dipole-dipole forces are

Which has the highest vapor pressure at room temperature?

At 20°C water has a vapor pressure of 0.0231 atm. If you bubble air through a container of water and collect 1 L of it at a total pressure of 1 atm, how many grams of water are in your sample of air (you can assume it is saturated)?

The Atom in Modern Chemistry

Chemical Formulas, Equations, and Reaction Yields

Chemical Bonding: the Classical Description

Introduction to Quantum Mechanics

Quantum Mechanics and Atomic Structure

Quantum Mechanics and Molecular Structure

Bonding in Organic Molecules

Binding in Transition Metal Compounds and Coordination Complexes

The Gaseous State

Solutions

Thermodynamic Processes and Thermochemistry

Spontaneous Processes and Thermodynamic Equilibrium

Chemical Equilibrium

Acid-Base Equilibria

Solubility and Precipitation Equilibria

Electrochemistry

Chemical Kinetics

Nuclear Chemistry

Molecular Spectroscopy and Photochemistry

Structure and Bonding in Solids

Inorganic Materials

Polymeric Materials and Soft Condensed Matter

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Exam 10: Solids, Liquids, and Phase Transitions

A supercritical fluid has a density that

Which do you think will have the highest surface tension?

The triple point of a compound is at 38.2°C and a pressure of 0.75 atm. A gaseous sample of the substance is held at a constant pressure of 0.79 atm. Initially the sample is at 50°C and is slowly cooled until it is -25°C. What if any phase transitions occur?

Which do you think has a higher boiling point, n-butanol or tert-butanol?

Generally if a liquid has stronger intermolecular attractions it will have

What types of intermolecular forces would you expect to find in CHCl3?

The process of a solid converting directly to a gas is called

At the triple point

In the phase diagram of water increasing pressure leads to lower melting temperatures.

Which do you predict will have the largest intermolecular attraction F2, Cl2, Br2, I2?

Dipole-dipole forces are

Which has the highest vapor pressure at room temperature?

At 20°C water has a vapor pressure of 0.0231 atm. If you bubble air through a container of water and collect 1 L of it at a total pressure of 1 atm, how many grams of water are in your sample of air (you can assume it is saturated)?

The Atom in Modern Chemistry

Chemical Formulas, Equations, and Reaction Yields

Chemical Bonding: the Classical Description

Introduction to Quantum Mechanics

Quantum Mechanics and Atomic Structure

Quantum Mechanics and Molecular Structure

Bonding in Organic Molecules

Binding in Transition Metal Compounds and Coordination Complexes

The Gaseous State

Solutions

Thermodynamic Processes and Thermochemistry

Spontaneous Processes and Thermodynamic Equilibrium

Chemical Equilibrium

Acid-Base Equilibria

Solubility and Precipitation Equilibria

Electrochemistry

Chemical Kinetics

Nuclear Chemistry

Molecular Spectroscopy and Photochemistry

Structure and Bonding in Solids

Inorganic Materials

Polymeric Materials and Soft Condensed Matter

Filters

What types of intermolecular forces would you expect to find in CHCl₃?

Which do you predict will have the largest intermolecular attraction F₂, Cl₂, Br₂, I₂?