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Chemistry
Q:
Which type of bonding does Sr form upon solidification?
A) covalent network
B) ionic
C) metallic
D) molecular
Q:
Which of the following forms a molecular solid?
A) NH4NO3
B) C6H4Cl2
C) SiO2
D) copper
Q:
How much heat is released when 105 g of steam at 100.0C is cooled to ice at -15.0C? 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).
A) 54.8 kJ
B) 273 kJ
C) 319 kJ
D) 347 kJ
Q:
Ethyl chloride, C2H5Cl, is used as a local anesthetic. It works by cooling tissue as it vaporizes; its heat of vaporization is 26.4 kJ/mol. How much heat could be removed by 20.0 g of ethyl chloride?
A) 8.18 kJ
B) 341 kJ
C) 528 kJ
D) 3410 kJ
Q:
The normal boiling point for H2Te is higher than the normal boiling point for H2Se. This can be explained by
A) larger dipole-dipole forces for H2Te.
B) larger dispersion forces for H2Te.
C) larger hydrogen-bond forces for H2Te.
D) larger dipole-dipole forces, larger dispersion forces, and larger hydrogen-bond forces for H2Te.
Q:
Which of the following compounds exhibits only dispersion and dipole-dipole intermolecular interactions?
A) H2
B) HI
C) CO2
D) CH3NH2
Q:
In liquid propanol,
CH3CH2CH2OH
which intermolecular forces are present?
A) Dispersion, hydrogen bonding and dipole-dipole forces are present.
B) Only dipole-dipole and ion-dipole forces are present.
C) Only dispersion and dipole-dipole forces are present.
D) Only hydrogen bonding forces are present.
Q:
Which of the following compounds exhibits hydrogen bonding?
A) CH3Cl
B) HI
C) CH3OCH3
D) NH3
Q:
Which is expected to have the largest dispersion forces?
A) C3H8
B) C12H26
C) F2
D) BeCl2
Q:
Which has the smallest dipole-dipole forces?
A) CH3Cl
B) HBr
C) O2
D) NO
Q:
Which of the following molecules does not have a dipole moment?
A) C2H2
B) H2O
C) CH3CH2OH
D) HI
Q:
Which of the following should have the largest dipole moment?
A) F2(g)
B) BCl3(g)
C) KBr(g)
D) CH3I(g)
Q:
Which covalent bond is the most polar?
A) N-F
B) C-F
C) Cl-F
D) F-F
Q:
What is the physical phase of the substance at T = 400 K and P = 2.0 atm?A) gasB) liquidC) solidD) supercritical fluid
Q:
What is the physical phase of the substance at T = 225 K and P = 1.1 atm?
A) gas
B) liquid
C) solid
D) supercritical fluid
Q:
What is the physical phase of the substance at T = 100 K and P = 0.1 atm?
A) gas
B) liquid
C) solid
D) supercritical fluid
Q:
The approximate normal melting point of this substance is
A) 100 K.
B) 190 K.
C) 300 K.
D) 430 K.
Q:
The phase diagram of a substance is shown below.The approximate normal boiling point of this substance isA) 180 K.B) 190 K.C) 300 K.D) 430 K.
Q:
What phase changes occur when the pressure is held constant at 0.25 atm and the temperature increases from 100C to 300C?A) liquid -> gasB) solid -> gasC) solid -> liquidD) solid -> liquid -> gas
Q:
What phase changes occur when the temperature is held constant at 140C and the pressure is increased from 0.25 atm to 1.4 atm?A) gas -> liquid -> solidB) gas -> solid -> liquidC) liquid -> solid -> gasD) solid -> liquid -> vapor
Q:
What phases can be present at 200C and 0.75 atm pressure?A) only the vapor phaseB) only the liquid phaseC) only the solid phaseD) both the solid and vapor phases
Q:
The normal boiling point of this substance is approximately
A) 25C.
B) 140C.
C) 300C.
D) 350C.
Q:
From the phase diagram above, the minimum pressure at which this substance can exist in the liquid phase is
A) 0.25 atm.
B) 0.45 atm.
C) 1.0 atm.
D) 1.2 atm.
Q:
The temperature and pressure at which all three phases can coexist in equilibrium is
A) 0.25 atm and 110C.
B) 1.0 atm and 140C.
C) 1.25 atm and 300C.
D) 0.45 atm and 130C.
Q:
The solid and liquid phases can exist in equilibrium along line
A) AC.
B) CB.
C) CD.
D) BD.
Q:
Melting occurs along the
A) AC line.
B) CB line.
C) CD line.
D) all of the above
Q:
Use the diagram below to answer the following questions.According to the diagram, the solid phase of this substanceA) has the same density as the liquid phase.B) is less dense than water.C) is less dense than the liquid phase.D) is more dense than the liquid phase.
Q:
Consider a compound that undergoes sublimation at 125C and a pressure of one atm. Which of the following could be a heating curve appropriate for heating the compound from 100C to 150C?A) see graph aB) see graph bC) see graph cD) see graph d
Q:
If cation M has a 2+ charge and anion A has a 2- charge, what is the oxidation state of cation M'?
A) +1
B) +2
C) +3
D) +4
Q:
What is the empirical formula of the mineral?
A) MM'A
B) MM'A3
C) M2M'A3
D) M8M'A6
Q:
How many anions are in the unit cell?
A) 1
B) 2
C) 3
D) 6
Q:
How many cations M are in the unit cell?
A) 1
B) 2
C) 4
D) 8
Q:
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?A) MAB) MA2C) M2AD) M4A4
Q:
How many cations and how many anions are in the unit cell?
A) 4 cations and 4 anions
B) 4 cations and 8 anions
C) 4 cations and 14 anions
D) 8 cations and 4 anions
Q:
A certain mineral crystallizes in the cubic unit cell shown below.What kind of packing do the anions adopt?A) body-centered cubicB) cubic closest packed (face-centered cubic)C) hexagonal closest packedD) simple cubic
Q:
Identify the packing in the figure shown below.A) body-centered cubicB) cubic closest packed (face-centered cubic)C) hexagonal closest packedD) simple cubic
Q:
Identify the packing in the figure shown below. A) body-centered cubic
B) cubic closest packed (face-centered cubic)
C) hexagonal closest packed
D) simple cubic
Q:
Identify the packing in the figure shown below. A) body-centered cubic
B) cubic closest packed (face-centered cubic)
C) hexagonal closest packed
D) simple cubic
Q:
Identify the packing in the figure shown below. A) body-centered cubic
B) cubic closest packed (face-centered cubic)
C) hexagonal closest packed
D) simple cubic
Q:
What is the formula of the compound formed from M and X?
A) MX
B) MX2
C) MX3
D) MX4
Q:
The picture shown below represents a two-dimensional lattice of atoms M and X.Which of the areas designated A, B, and C are smallest repeating units, analogous to two-dimensional unit cells?A) only AB) only BC) only CD) A, B, or C
Q:
From the plot of vapor pressure as a function of temperature shown below, the normal boiling point for tert-butyl alcohol is approximatelyA) 0C.B) 40C.C) 85C.D) 100C.
Q:
Based on the relative strengths of the intermolecular forces of attraction of each substance, which is the most likely vapor pressure vs. temperature curve for water?
A) curve (a)
B) curve (b)
C) curve (c)
D) curve (d)
Q:
Based on the relative strengths of the intermolecular forces of attraction of each substance, which is the most likely vapor pressure vs. temperature curve for mercury?
A) curve (a)
B) curve (b)
C) curve (c)
D) curve (d)
Q:
Based on the relative strengths of the intermolecular forces of attraction of each substance, which is the most likely vapor pressure vs. temperature curve for ethanol?
A) curve (a)
B) curve (b)
C) curve (c)
D) curve (d)
Q:
The plots below represent vapor pressure vs. temperature curves for diethyl ether, ethanol, mercury, and water, not necessarily in that order.Based on the relative strengths of the intermolecular forces of attraction of each substance, which is the most likely vapor pressure vs. temperature curve for diethyl ether?A) curve (a)B) curve (b)C) curve (c)D) curve (d)
Q:
If figure (1) represents the vapor pressure of water, at 25C, which figure represents the vapor pressure of mercury at 25C?A) figure (2)B) figure (3)C) figure (4)
Q:
If figure (1) represents the vapor pressure of diethyl ether, CH3CH2OCH2CH3, at 25C, which figure represents the vapor pressure of ethanol at 25C?
A) figure (2)
B) figure (3)
C) figure (4)
Q:
If figure (1) represents the vapor pressure of water at 25C, which figure represents the vapor pressure of ethanol, CH3CH2OH at 25C?A) figure (2)B) figure (3)C) figure (4)
Q:
If figure (1) represents the vapor pressure of water at 25C in a 1 liter container, which figure represents the vapor pressure of water at 25C in a 2 liter container?A) figure (2)B) figure (3)C) figure (4)
Q:
If figure (1) represents the vapor pressure of water at 25C, which figure represents the vapor pressure of water at 45C?A) figure (2)B) figure (3)C) figure (4)
Q:
Which drawing best represents hydrogen bonding in methylamine, CH3NH2?A) drawing (1)B) drawing (2)C) drawing (3)D) drawing (4)
Q:
Which drawing below best represents hydrogen bonding methanol, CH3OH? A) drawing (1)
B) drawing (2)
C) drawing (3)
D) drawing (4)
Q:
Which drawing best represents hydrogen bonding? A) drawing (1)
B) drawing (2)
C) drawing (3)
D) drawing (4)
Q:
Which best indicates the direction of the dipole moment in acetone, (CH3)2C=O? A) drawing (1)
B) drawing (2)
C) drawing (3)
D) drawing (4)
Q:
Which best indicates the direction of the dipole moment in formaldehyde, H2C=O? A) drawing (1)
B) drawing (2)
C) drawing (3)
D) drawing (4)
Q:
Which drawing best shows the direction of the dipole moment in H2C=CCl2? A) drawing (1)
B) drawing (2)
C) drawing (3)
D) drawing (4)
Q:
Which drawing best shows the molecular polarity of methylamine, CH3NH2, 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)
Q:
Which drawing best accounts for the polarity of methanol, CH3OH, 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)
Q:
Which drawing best accounts for the polarity of water, H2O, 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)
Q:
In the drawing of acetic acid, CH3CO2H, a partial negative charge (-) occurs onA) only atom (a).B) only atom (b).C) atoms (a) and (c).D) atoms (b) and (d).
Q:
In the drawing of acetic acid, CH3CO2H, a partial positive charge (δ+) occurs onA) only atom (a).B) only atom (b).C) atoms (a) and (c).D) atoms (b) and (d).
Q:
In the drawing of acetaldehyde, CH3CHO, the largest partial negative charge ( -) occurs onA) atom (a).B) atom (b).C) atom (c).D) atom (d).
Q:
In the drawing of acetaldehyde, CH3CHO, the largest partial positive charge (+) occurs onA) atom (a).B) atom (b).C) atom (c).D) atom (d).
Q:
The liquid crystal stateA) is a liquid in which the molecules tend to assume an overall orientation with respect to each other.B) occurs when a supercritical fluid is rapidly cooled below the critical point.C) occurs when an amorphous solid first begins to melt.D) occurs when the first crystals form in the liquid during freezing.
Q:
A supercritical fluid refers to a substance
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.
Q:
Which transition could occur if a solid is heated at a pressure above the triple point pressure?
A) condensation
B) deposition
C) melting
D) sublimation
Q:
Which transition could occur if a solid is heated at a pressure below the triple point pressure?
A) condensation
B) deposition
C) melting
D) sublimation
Q:
The critical temperature of a substance is the
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.
Q:
Pencil lead is actually
A) fullerene.
B) graphite.
C) lead.
D) silica.
Q:
Diamond is held together by
A) covalent bonds.
B) dipole-dipole forces.
C) London dispersion forces.
D) all of the above
Q:
The layers of graphite are held together by
A) covalent bonds.
B) dipole-dipole forces.
C) London dispersion forces.
D) all of the above
Q:
Which of the following is not an allotrope of carbon?
A) coal
B) diamond
C) fullerene
D) graphite
Q:
O2 and O3 are ________ of oxygen.
A) allotropes
B) isomers
C) isotopes
D) stereomers
Q:
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?
A) MA
B) MA2
C) M2A
D) M4A8
Q:
How many Cl- ions are around each K+ ion in KCl, which has a cubic unit cell with Cl- ions on each corner and each face?
A) 1
B) 4
C) 6
D) 8
Q:
The edge length of a face-centered cubic lattice of NaCl is 564 pm. What is the density of NaCl in g/cm3?
A) 0.720
B) 1.08
C) 2.16
D) 4.32
Q:
An ionic compound crystallizes in a unit cell having a face-centered cubic array of metal ions, Mn+, and all of the tetrahedral holes occupied by anions, X-. The empirical formula of this ionic compound isA) MX.B) MX2.C) M2X.D) M7X4.
Q:
An ionic compound crystallizes in a unit cell having a face-centered cubic array of anions, X-, and half of the tetrahedral holes filled with metal ions, Mn+ The empirical formula of this ionic compound isA) MX.B) MX2.C) M2X.D) M2X7.
Q:
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?
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