Question 1

A safe method of removing caffeine from coffee is through the use of

Accepted Answer

A) supercritical carbon dioxide. 
B) benzene. 
C) methylene chloride. 
D) water. 
A) supercritical carbon dioxide. 
B) benzene. 
C) methylene chloride. 
D) water.

Question 2

A certain mineral,MS1U1B1xS1U1B0M'S1U1B1yS1U1B0AS1U1B1zS1U1B0,crystallizes in the cubic unit cell shown below.M and M' represent cations and A represents the anions.  
-How many cations M are in the unit cell?

Accepted Answer

A) 1 
B) 2 
C) 4 
D) 8 
A) 1 
B) 2 
C) 4 
D) 8

Question 3

Which of the following is an allotrope of carbon?

Accepted Answer

A) diamond 
B) glass 
C) coal 
D) carbon monoxide 
A) diamond 
B) glass 
C) coal 
D) carbon monoxide

Question 4

-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 5

Ethyl chloride,C2H5Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes.The heat of vaporization is 26.4 kJ/mol.How much heat could be removed by 60.0 g of ethyl chloride?

Accepted Answer

A) 24.6 kJ 
B) 1584 kJ 
C) 2.28 kJ 
D) 1703 kJ 
A) 24.6 kJ 
B) 1584 kJ 
C) 2.28 kJ 
D) 1703 kJ

Question 6

Which of the following is most likely to have the highest viscosity at 25°C?

Accepted Answer

A) C6H14 
B) HOCH2CH2OH 
C) C3H7OH 
D) C7H8 
A) C6H14 
B) HOCH2CH2OH 
C) C3H7OH 
D) C7H8

Question 7

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

Accepted Answer

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

Question 8

The cubic closest-packed arrangement of atoms is the same as which cubic unit cell?

Accepted Answer

The answer of The cubic closest-packed arrangement of atoms is...

Question 9

Which is classified as an amorphous solid?

Accepted Answer

A) palladium(II)bromide 
B) phosphorus tetrachloride 
C) plastic 
D) potassium iodide 
A) palladium(II)bromide 
B) phosphorus tetrachloride 
C) plastic 
D) potassium iodide

Question 10

.  
-If figure (1)represents the vapor pressure of water at 25°C in a 1 liter container,which figure represents the vapor pressure of water at 25°C in a 2 liter container?

Accepted Answer

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

Question 11

The wavelength of light used to observe an object must be ________ than the object itself.

Accepted Answer

A) larger 
B) smaller 
C) of higher energy 
D) of lower energy 
A) larger 
B) smaller 
C) of higher energy 
D) of lower energy

Question 12

A binary ionic compound,MxAy,crystallizes in a cubic structure that contains eight anions (A)entirely within its unit cell and a cation (M)on each corner and on each face.What is the empirical formula of this compound?

Accepted Answer

A) MA 
B) MA2 
C) M2A 
D) M4A8 
A) MA 
B) MA2 
C) M2A 
D) M4A8

Question 13

Barium has a radius of 224 pm and crystallizes in a body-centered cubic structure.What is the edge length of the unit cell?

Accepted Answer

A) 259 pm 
B) 317 pm 
C) 448 pm 
D) 517 pm 
A) 259 pm 
B) 317 pm 
C) 448 pm 
D) 517 pm

Question 14

Ni has a face-centered unit cell.The number of Ni atoms in the unit cell is ________.

Accepted Answer

The answer of Ni has a face-centered unit cell.The number...

Question 15

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 16

What phase changes occur when the pressure is held constant at 0.25 atm and the temperature increases from 100°C to 300°C?

Accepted Answer

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

Question 17

The picture shown below represents a two-dimensional lattice of atoms M and X.  
-What is the formula of the compound formed from M and X?

Accepted Answer

A) MX 
B) MX2 
C) MX3 
D) MX4 
A) MX 
B) MX2 
C) MX3 
D) MX4

Question 18

How much heat is released when 125.0 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) 91.3 kJ 
B) 325 kJ 
C) 380 kJ 
D) 413 kJ 
A) 91.3 kJ 
B) 325 kJ 
C) 380 kJ 
D) 413 kJ

Question 19

Solids having no ordered long-range structure are classified as

Accepted Answer

A) amorphous solids. 
B) crystalline solids. 
C) nonmetallic solids. 
D) covalent network solids. 
A) amorphous solids. 
B) crystalline solids. 
C) nonmetallic solids. 
D) covalent network solids.

Question 20

The normal boiling point for HBr is higher than the normal boiling point for HCl.This can be explained by

Accepted Answer

A) larger dipole-dipole forces for HBr. 
B) larger dispersion forces for HBr. 
C) larger hydrogen-bond forces for HBr. 
D) larger dipole-dipole forces,larger dispersion forces,and larger hydrogen-bond forces for HBr. 
A) larger dipole-dipole forces for HBr. 
B) larger dispersion forces for HBr. 
C) larger hydrogen-bond forces for HBr. 
D) larger dipole-dipole forces,larger dispersion forces,and larger hydrogen-bond forces for HBr.

Exam 11: Liquids, solids, and Phase Changes

A safe method of removing caffeine from coffee is through the use of

A certain mineral,MxM'yAz,crystallizes in the cubic unit cell shown below.M and M' represent cations and A represents the anions. -How many cations M are in the unit cell?

Which of the following is an allotrope of carbon?

-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?

Ethyl chloride,C2H5Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes.The heat of vaporization is 26.4 kJ/mol.How much heat could be removed by 60.0 g of ethyl chloride?

Which of the following is most likely to have the highest viscosity at 25°C?

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

The cubic closest-packed arrangement of atoms is the same as which cubic unit cell?

Which is classified as an amorphous solid?

. -If figure (1)represents the vapor pressure of water at 25°C in a 1 liter container,which figure represents the vapor pressure of water at 25°C in a 2 liter container?

The wavelength of light used to observe an object must be ________ than the object itself.

A binary ionic compound,MxAy,crystallizes in a cubic structure that contains eight anions (A)entirely within its unit cell and a cation (M)on each corner and on each face.What is the empirical formula of this compound?

Barium has a radius of 224 pm and crystallizes in a body-centered cubic structure.What is the edge length of the unit cell?

Ni has a face-centered unit cell.The number of Ni atoms in the unit cell is ________.

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

What phase changes occur when the pressure is held constant at 0.25 atm and the temperature increases from 100°C to 300°C?

The picture shown below represents a two-dimensional lattice of atoms M and X. -What is the formula of the compound formed from M and X?

Solids having no ordered long-range structure are classified as

The normal boiling point for HBr is higher than the normal boiling point for HCl.This can be explained by

Chemical Tools: Experimentation and Measurement

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Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Periodicity and the Electronic Structure of Atoms

Ionic Compounds: Periodic Trends and Bonding

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Covalent Compounds: Bonding Theories 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

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Transition Elements and Coordination Chemistry

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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. -How many cations M are in the unit cell?

-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?

Ethyl chloride,C₂H₅Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes.The heat of vaporization is 26.4 kJ/mol.How much heat could be removed by 60.0 g of ethyl chloride?

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

A binary ionic compound,M_xA_y,crystallizes in a cubic structure that contains eight anions (A)entirely within its unit cell and a cation (M)on each corner and on each face.What is the empirical formula of this compound?