Question 1

Layers of atoms having a spacing of 105 pm will diffract X-rays with d = 154.2 pm at an angle of ________ degrees.

Accepted Answer

The answer of Layers of atoms having a spacing of...

Question 2

Which covalent bond is the most polar?

Accepted Answer

A) N-F 
B) C-F 
C) Cl-F 
D) F-F 
A) N-F 
B) C-F 
C) Cl-F 
D) F-F

Question 3

The two most efficiently packed unit cells have the hexagonal closest-packed and the ________ the atomic arrangements.

Accepted Answer

cubic clos

Question 4

What phase changes occur when the temperature is held constant at 140°C and the pressure is increased from 0.25 atm to 1.4 atm?

Accepted Answer

A) gas → liquid → solid 
B) gas → solid → liquid 
C) liquid → solid → gas 
D) solid → liquid → vapor 
A) gas → liquid → solid 
B) gas → solid → liquid 
C) liquid → solid → gas 
D) solid → liquid → vapor

Question 5

When a substance melts at its normal melting point,the sign of ΔH is ________ and the sign of ΔS of this phase change is ________.

Accepted Answer

A) +,- 
B) -,+ 
C) +,+ 
D) -,- 
A) +,- 
B) -,+ 
C) +,+ 
D) -,-

Question 6

A certain mineral,MS1U1B1xS1U1B0M'S1U1B1yS1U1B0AS1U1B1zS1U1B0,crystallizes in the cubic unit cell shown below.M and M' represent cations and A represents the anions.  
-What is the empirical formula of the mineral?

Accepted Answer

A) MM'A 
B) MM'A3 
C) M2M'A3 
D) M8M'A6 
A) MM'A 
B) MM'A3 
C) M2M'A3 
D) M8M'A6

Question 7

Which type of bonding does Mg form upon solidification?

Accepted Answer

A) covalent network 
B) ionic 
C) metallic 
D) molecular 
A) covalent network 
B) ionic 
C) metallic 
D) molecular

Question 8

Which of the intermolecular forces is the most important contributor to the high surface tension shown by water?

Accepted Answer

A) dipole-dipole forces 
B) dispersion forces 
C) hydrogen bonding 
D) ion-dipole forces 
A) dipole-dipole forces 
B) dispersion forces 
C) hydrogen bonding 
D) ion-dipole forces

Question 9

Which transition could occur if a solid is heated at a pressure below the triple point pressure?

Accepted Answer

A) condensation 
B) deposition 
C) melting 
D) sublimation 
A) condensation 
B) deposition 
C) melting 
D) sublimation

Question 10

Which transition could occur if a solid is heated at a pressure above the triple point pressure?

Accepted Answer

A) condensation 
B) deposition 
C) melting 
D) sublimation 
A) condensation 
B) deposition 
C) melting 
D) sublimation

Question 11

Iron crystallizes in a body-centered cubic cell having an edge length of 287 pm.What is the density of iron in g/cm3.

Accepted Answer

A) 1)99 
B) 7)85 
C) 11.9 
D) 15.9 
A) 1)99 
B) 7)85 
C) 11.9 
D) 15.9

Question 12

-If figure (1)represents the vapor pressure of diethyl ether,CH3CH2OCH2CH3,at 25°C,which figure represents the vapor pressure of ethanol at 25°C?

Accepted Answer

A) figure (2) 
B) figure (3) 
C) figure (4) 
A) figure (2) 
B) figure (3) 
C) figure (4)

Question 13

Which has the smallest dipole-dipole forces?

Accepted Answer

A) CH3Cl  
B) HBr  
C) O2 
D) NO  
A) CH3Cl  
B) HBr  
C) O2 
D) NO

Question 14

Which is expected to have the highest surface tension at 25°?

Accepted Answer

A) C5H12 
B) C6H6 
C) C2H5OH 
D) C3H5(OH)3 
A) C5H12 
B) C6H6 
C) C2H5OH 
D) C3H5(OH)3

Question 15

Rubber is classified as an ________ solid,whereas diamond is classified as a ________ solid.

Accepted Answer

amorphous,

Question 16

Which is classified as an amorphous solid?

Accepted Answer

A) palladium(II)chloride 
B) phosphorus tetrachloride 
C) plastic 
D) platinum 
A) palladium(II)chloride 
B) phosphorus tetrachloride 
C) plastic 
D) platinum

Question 17

How much heat is released when 105 g of steam at 100.0°C is cooled to ice at -15.0°C? The enthalpy of vaporization of water is 40.67 kJ/mol,the enthalpy of fusion for water is 6.01 kJ/mol,the molar heat capacity of liquid water is 75.4 J/(mol ∙ °C),and the molar heat capacity of ice is 36.4 J/(mol ∙ °C).

Accepted Answer

A) 54.8 kJ 
B) 273 kJ 
C) 319 kJ 
D) 347 kJ 
A) 54.8 kJ 
B) 273 kJ 
C) 319 kJ 
D) 347 kJ

Question 18

Which of the following compounds exhibits only dispersion and dipole-dipole intermolecular interactions?

Accepted Answer

A) N2 
B) HBr 
C) CO2 
D) H2O 
A) N2 
B) HBr 
C) CO2 
D) H2O

Question 19

-In the drawing of acetaldehyde,CH3CHO,the largest partial negative charge (δ -)occurs on

Accepted Answer

A) atom (a). 
B) atom (b). 
C) atom (c). 
D) atom (d). 
A) atom (a). 
B) atom (b). 
C) atom (c). 
D) atom (d).

Question 20

Arrange the following in order of increasing boiling point.
CH3CH2OH CH3CH2CH3 H3C-O-CH3 CH3CH2NH2
I II III IV

Accepted Answer

A) IV < III < II < I 
B) II < III < IV < I 
C) I < IV < III < II 
D) II < III < I < IV 
A) IV < III < II < I 
B) II < III < IV < I 
C) I < IV < III < II 
D) II < III < I < IV

Exam 10: Liquids,solids,and Phase Changes

Layers of atoms having a spacing of 105 pm will diffract X-rays with d = 154.2 pm at an angle of ________ degrees.

Which covalent bond is the most polar?

The two most efficiently packed unit cells have the hexagonal closest-packed and the ________ the atomic arrangements.

What phase changes occur when the temperature is held constant at 140°C and the pressure is increased from 0.25 atm to 1.4 atm?

When a substance melts at its normal melting point,the sign of ΔH is ________ and the sign of ΔS of this phase change is ________.

A certain mineral,MxM'yAz,crystallizes in the cubic unit cell shown below.M and M' represent cations and A represents the anions. -What is the empirical formula of the mineral?

Which type of bonding does Mg form upon solidification?

Which of the intermolecular forces is the most important contributor to the high surface tension shown by water?

Which transition could occur if a solid is heated at a pressure below the triple point pressure?

Which transition could occur if a solid is heated at a pressure above the triple point pressure?

Iron crystallizes in a body-centered cubic cell having an edge length of 287 pm.What is the density of iron in g/cm3.

-If figure (1)represents the vapor pressure of diethyl ether,CH3CH2OCH2CH3,at 25°C,which figure represents the vapor pressure of ethanol at 25°C?

Which has the smallest dipole-dipole forces?

Which is expected to have the highest surface tension at 25°?

Rubber is classified as an ________ solid,whereas diamond is classified as a ________ solid.

Which is classified as an amorphous solid?

Which of the following compounds exhibits only dispersion and dipole-dipole intermolecular interactions?

-In the drawing of acetaldehyde,CH3CHO,the largest partial negative charge (δ -)occurs on

Arrange the following in order of increasing boiling point. CH3CH2OH CH3CH2CH3 H3C-O-CH3 CH3CH2NH2 I II III IV

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

When a substance melts at its normal melting point,the sign of ΔH is and the sign of ΔS of this phase change is .

A certain mineral,M_xM'_yA_z,crystallizes in the cubic unit cell shown below.M and M' represent cations and A represents the anions. -What is the empirical formula of the mineral?

Iron crystallizes in a body-centered cubic cell having an edge length of 287 pm.What is the density of iron in g/cm³.

-If figure (1)represents the vapor pressure of diethyl ether,CH₃CH₂OCH₂CH₃,at 25°C,which figure represents the vapor pressure of ethanol at 25°C?

Rubber is classified as an solid,whereas diamond is classified as a solid.

-In the drawing of acetaldehyde,CH₃CHO,the largest partial negative charge (δ -)occurs on

Arrange the following in order of increasing boiling point. CH₃CH₂OH CH₃CH₂CH₃ H₃C-O-CH₃ CH₃CH₂NH₂ I II III IV