Question 1

Solids having no ordered long-range structure are classified as

Accepted Answer

A)  amorphous
B)  crystalline
C)  metallic
D)  molecular

Question 2

The critical temperature of a substance is the

Accepted Answer

A)  highest temperature at which the liquid phase can exist in equilibrium with the gas phase.
B)  temperature above which the compound decomposes.
C)  temperature at which all three phases can exist in equilibrium.
D)  temperature at which sublimation occurs.

Question 3

The intermolecular forces formed when NaCl is dissolved in water are ________ forces.

Accepted Answer

The answer of The intermolecular forces formed when NaCl is...

Question 4

Which best indicates the direction of the dipole moment in formaldehyde,H2C=O? 2C=O?   A) drawing (1)  B) drawing (2)  C) drawing (3)  D) drawing (4) " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  drawing (1) 
B)  drawing (2) 
C)  drawing (3) 
D)  drawing (4)

Question 5

What is the physical phase of the substance at T = 400 K and P = 2.0 atm?

Accepted Answer

A)  gas
B)  liquid
C)  solid
D)  supercritical fluid

Question 6

What is the physical phase of the substance at T = 225 K and P = 1.1 atm?

Accepted Answer

A)  gas
B)  liquid
C)  solid
D)  supercritical fluid

Question 7

Which has the smallest dipole-dipole forces?

Accepted Answer

A)  CH3F
B)  HCl
C)  N2
D)  CO

Question 8

A certain mineral crystallizes in the cubic unit cell shown below.M represents the cations and A represents the anions.What is the empirical formula of the mineral? 2 C) M2A D) M4A4" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  MA
B)  MA2
C)  M2A
D)  M4A4

Question 9

For the process: HNO3(g) ⇌ HNO3(l) 
ΔH° is -39.04 kJ/mol and ΔS° is -111.74 J/(mol ∙ K) .What is the normal boiling point of pure HNO3?

Accepted Answer

A)  2) 86°C
B)  76.2°C
C)  270.3°C
D)  349.4°C

Question 10

The vapor pressure of liquid chloroform,CHCl3,is 400.0 torr at 24.1°C and 100.0 torr at -6.3°C.What is ΔHvap of chloroform?

Accepted Answer

A)  15.3 kJ/mol
B)  30.1 kJ/mol
C)  57.6 kJ/mol
D)  86.7 kJ/mol

Question 11

KCl crystallizes in a cubic unit cell with Cl- ions on each corner and each face.How many K+ ions and Cl- ions are in each unit cell of KCl?

Accepted Answer

A)  1 K+ ion and 1 Cl- ion
B)  2 K+ ions and 2 Cl- ions
C)  4 K+ ions and 4 Cl- ions
D)  8 K+ ions and 8 Cl- ions

Question 12

A supercritical fluid refers to a substance

Accepted Answer

A)  above both its critical temperature and its critical pressure.
B)  at its triple point.
C)  that is in the liquid crystal state.
D)  with a viscosity of zero.

Question 13

Which drawing below best represents hydrogen bonding methanol,CH3OH? 3OH?   A) drawing (1)  B) drawing (2)  C) drawing (3)  D) drawing (4) " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  drawing (1) 
B)  drawing (2) 
C)  drawing (3) 
D)  drawing (4)

Question 14

Which of the following molecules does not have a dipole moment?

Accepted Answer

A)  C2H2    
B)  H2O
C)  CH3CH2OH
D)  H I

Question 15

Which drawing best accounts for the polarity of methanol,CH3OH,and the bond polarities that make a major contribution to the overall molecular polarity? 3OH,and the bond polarities that make a major contribution to the overall molecular polarity?   A) drawing (1)  B) drawing (2)  C) drawing (3)  D) drawing (4) " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  drawing (1) 
B)  drawing (2) 
C)  drawing (3) 
D)  drawing (4)

Question 16

The phase diagram of a substance is shown below. 
-The approximate normal melting point of this substance is

Accepted Answer

A)  100 K.
B)  190 K.
C)  300 K.
D)  430 K.

Question 17

The Br-Cl bond has 5.05% ionic character and a dipole moment of 0.518 D.What is the distance between atoms in BrCl?

Accepted Answer

The answer of The Br-Cl bond has 5.05% ionic character...

Question 18

Which of the following exhibits ion-dipole forces?

Accepted Answer

A)  NaCl(s) 
B)  NaCl(aq) 
C)  Na(s) 
D)  Cl2(g)

Question 19

In the molecule BF3 there is a δ+ charge on the ________ atom and a δ- charge on the ________ atom.

Accepted Answer

Question 20

Which of the following compounds exhibits hydrogen bonding?

Accepted Answer

A)  CH3Cl
B)  HI 
C)  CH3OCH3
D)  NH3

Exam 10: Liquids,solids,and Phase Changes

In the molecule BF3 there is a δ+ charge on the ________ atom and a δ- charge on the ________ atom.

Correct AnswerverifiedShow Answer

Which of the following compounds exhibits hydrogen bonding?

Correct AnswerverifiedShow Answer

Which has the smallest dipole-dipole forces?

Correct AnswerverifiedShow Answer

A supercritical fluid refers to a substance

Correct AnswerverifiedShow Answer

Which drawing below best represents hydrogen bonding methanol,CH3OH?

Correct AnswerverifiedShow Answer

Which best indicates the direction of the dipole moment in formaldehyde,H2C=O?

Correct AnswerverifiedShow Answer

Which of the following exhibits ion-dipole forces?

Correct AnswerverifiedShow Answer

Solids having no ordered long-range structure are classified as

Correct AnswerverifiedShow Answer

What is the physical phase of the substance at T = 225 K and P = 1.1 atm?

Correct AnswerverifiedShow Answer

The critical temperature of a substance is the

Correct AnswerverifiedShow Answer

The vapor pressure of liquid chloroform,CHCl3,is 400.0 torr at 24.1°C and 100.0 torr at -6.3°C.What is ΔHvap of chloroform?

Correct AnswerverifiedShow Answer

Which of the following molecules does not have a dipole moment?

Correct AnswerverifiedShow Answer

KCl crystallizes in a cubic unit cell with Cl- ions on each corner and each face.How many K+ ions and Cl- ions are in each unit cell of KCl?

Correct AnswerverifiedShow Answer

The intermolecular forces formed when NaCl is dissolved in water are ________ forces.

Correct AnswerverifiedShow Answer

What is the physical phase of the substance at T = 400 K and P = 2.0 atm?

Correct AnswerverifiedShow Answer

The Br-Cl bond has 5.05% ionic character and a dipole moment of 0.518 D.What is the distance between atoms in BrCl?

Correct AnswerverifiedShow Answer

The phase diagram of a substance is shown below. -The approximate normal melting point of this substance is

Correct AnswerverifiedShow Answer

A certain mineral crystallizes in the cubic unit cell shown below.M represents the cations and A represents the anions.What is the empirical formula of the mineral?

Correct AnswerverifiedShow Answer

For the process: HNO3(g) ⇌ HNO3(l) ΔH° is -39.04 kJ/mol and ΔS° is -111.74 J/(mol ∙ K) .What is the normal boiling point of pure HNO3?

Correct AnswerverifiedShow Answer

Which drawing best accounts for the polarity of methanol,CH3OH,and the bond polarities that make a major contribution to the overall molecular polarity?

Correct AnswerverifiedShow Answer

In the molecule BF₃ there is a δ+ charge on the atom and a δ- charge on the atom.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which drawing below best represents hydrogen bonding methanol,CH₃OH?

Correct Answer
verified

Which best indicates the direction of the dipole moment in formaldehyde,H₂C=O?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The vapor pressure of liquid chloroform,CHCl₃,is 400.0 torr at 24.1°C and 100.0 torr at -6.3°C.What is ΔH_vap of chloroform?

Correct Answer
verified

Correct Answer
verified

KCl crystallizes in a cubic unit cell with Cl^- ions on each corner and each face.How many K⁺ ions and Cl^- ions are in each unit cell of KCl?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

For the process: HNO₃(g) ⇌ HNO₃(l) ΔH° is -39.04 kJ/mol and ΔS° is -111.74 J/(mol ∙ K) .What is the normal boiling point of pure HNO₃?

Correct Answer
verified

Which drawing best accounts for the polarity of methanol,CH₃OH,and the bond polarities that make a major contribution to the overall molecular polarity?

Correct Answer
verified