Question 1

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

Question 2

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

Accepted Answer

Question 3

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 
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 4

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

Question 5

Solids having no ordered long-range structure are classified as

Accepted Answer

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

Question 6

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

Accepted Answer

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

Question 7

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

Question 8

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

Accepted Answer

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

Question 9

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

Question 10

Which of the following exhibits ion-dipole forces?

Accepted Answer

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

Question 11

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 12

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

Accepted Answer

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

Question 13

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 14

Which has the smallest dipole-dipole forces?

Accepted Answer

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

Question 15

Which drawing below best represents hydrogen bonding methanol,CH3OH?

Accepted Answer

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

Question 16

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

Question 17

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. 
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 18

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?

Accepted Answer

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

Question 19

Which of the following compounds exhibits hydrogen bonding?

Accepted Answer

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

Question 20

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. 
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.

Exam 10: Liquids,solids,and Phase Changes

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

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

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?

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?

Solids having no ordered long-range structure are classified as

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

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?

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

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

Which of the following exhibits ion-dipole forces?

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?

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

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

Which has the smallest dipole-dipole forces?

Which drawing below best represents hydrogen bonding methanol,CH3OH?

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

The critical temperature of a substance is the

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?

Which of the following compounds exhibits hydrogen bonding?

A supercritical fluid refers to a substance

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

Filters

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

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?

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?

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

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?

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

Which drawing below best represents hydrogen bonding methanol,CH₃OH?