CHEM 102 Test Review (TopHat and Recitations)

Arrange the following in order of increasing boiling point. CH3CH2OH CH3CH2CH3 H3C-O-CH3 CH3CH2NH2 I II III IV A) II < III < I < IV B) IV < III < II < I C) I < IV < III < II D) II < III < IV < I

D) II < III < IV < I

The phase diagram of a substance is shown, what is the physical phase of the substance at T = 250 K and P = 1.1 atm? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Solid b Gas c Liquid d Solution

c Liquid

Which of the following forms an ionic solid? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Fe b CuZn c MgCl2 d CO2

c MgCl2

Which of the following contains ion-dipole forces? swer. a HCl(aq) b NaCl(s) c NaCl(aq) d NH3

c NaCl(aq)

Which of the following forms a covalent network solid? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Cu b H2O c SiO2 d NaCl

c SiO2

Which of the following molecules does not have a dipole moment? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a CH2=CH2 b NH3 c CH3NH2 d HCl

a CH2=CH2

The phase diagram of a substance is shown, the approximate normal boiling point of this substance is Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a 180 K. b 300 K. c 190 K. d 430 K.

b 300 K.

The approximate normal melting point of this substance is... A) 190 K. B) 430 K. C) 300 K. D) 100 K.

A) 190 K.

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 ̇Hvap of chloroform? A) 30.1 kJ/mol B) 15.3 kJ/mol C) 57.6 kJ/mol D) 86.7 kJ/mol

A) 30.1 kJ/mol

Which compound, shown with its dipole moment, is expected to exhibit the smallest percent ionic character? A) HCl, 1.11 D B) LiF, 6.28 D C) LiH, 6.00 D D) HF, 1.83 D

A) HCl, 1.11 D

Which substance in each of the following pairs is expected to have the larger dispersion forces? A) I2 in set I and n-butane in set II B) Br2 in set I and isobutane in set II C) I2 in set I and isobutane in set II D) Br2 in set I and n-butane in set II

A) I2 in set I and n-butane in set II

Which of the following compounds exhibits hydrogen bonding? A) NH3 B) HI C) H3C-O-CH3 D) CH3Cl

A) NH3

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)

A) curve (a)

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)

B) drawing (2)

If figure (1) represents the vapor pressure of water at 25°C, which figure represents the vapor pressure of water at 45°C? A) figure (2) B) figure (3) C) figure (4)

B) figure (3)

Which of the following forms a molecular solid? A) SiO2 B) NH4NO3 C) C6H4Cl2 D) copper

C) C6H4Cl2

In liquid methanol, CH3OH, which intermolecular forces are present? A) Only dipole-dipole and ion-dipole forces are present. B) Only dispersion and dipole-dipole forces are present. C) Dispersion, hydrogen bonding and dipole-dipole forces are present. D) Only hydrogen bonding forces are present.

C) Dispersion, hydrogen bonding and dipole-dipole forces are present.

Which of the following exhibits ion-dipole forces? A) Cl2(g) B) Na(s) C) NaCl(aq) D) NaCl(s)

C) NaCl(aq)

Which of the following forms an ionic solid? A) SO3 B) Ag C) RbI D) C7H15NH2

C) RbI

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

C) above both its critical temperature and its critical pressure.

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)

C) drawing (3)

Which of the following is most likely to have the highest viscosity at 25°C? A) C8H18 B) C2H5NH2 C) C4H10 D) HOCH2CH2OH

D) HOCH2CH2OH

Which is expected to have the largest dispersion forces? A) N2 B) CO2 C) C2H6 D) C8H18

D) C8H18

Which type of bonding does Sr form upon solidification? A) ionic B) molecular C) covalent network D) metallic

D) metallic

Molecules of a liquid can pass into the vapor phase only if the... A) vapor pressure of the liquid is high. B) liquid has little surface tension. C) temperature of the liquid is near its boiling point. D) molecules have sufficient kinetic energy to overcome the intermolecular forces in the liquid.

D) molecules have sufficient kinetic energy to overcome the intermolecular forces in the liquid.

Which transition could occur if a solid is heated at a pressure below the triple point pressure? A) condensation B) melting C) deposition D) sublimation

D) sublimation

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 CH3-O-CH3? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a curve (a) b curve (b) c curve (c) d curve (d)

a curve (a)

Consider a compound that undergoes sublimation at 125°C and a pressure of one atm. Which of the following could be a heating curve appropriate for heating the compound from 100°C to 150°C? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a A b B c C d D

b B

Which is expected to have the largest dispersion forces? a C2H6 b C8H18 c N2 d CO2

b C8H18

Which of the following compounds has the highest boiling point? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a CH3CH2OH b HOCH2CH2OH c H3C—O—CH3 d CH3CH2CH2CH3

b HOCH2CH2OH

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

b II < III < IV < I

A kitchen pressure cooker operates at 1.50 atm. The ΔHvap of water is 40.7 kJ/mol. What is the boiling point of water in the pressure cooker? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a 362 K b 373 K c 385 K d 410 K

c 385 K

Which of the following forms a metallic solid? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a NaCl b SiO2 c Cu d CO2

c Cu

Which of the following forms a molecular solid? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a SiO2 b Ni c H2O d Diamond

c H2O

If figure (1) represents the vapor pressure of water at 25°C, which figure represents the vapor pressure of ethanol, CH3CH2OH at 25°C? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a figure (1) b figure (2) c figure (3) d figure (4)

c figure (3)

Which of the following best explains why ΔHvap is usually higher than ΔHfusion? a Vaporization occurs at high temperature. b Vaporization involves the breaking of bonds within molecules. c Vaporization involves the breaking of all I.M.F between molecules. d None of them

c Vaporization involves the breaking of all I.M.F between molecules.

The vapor pressure of a pure liquid increases as the Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a average kinetic energy of the molecules in the liquid phase decreases. b intermolecular attractive forces increase. c temperature of the liquid phase decreases. d temperature of the liquid phase increases.

d temperature of the liquid phase increases.

The magnitude of the heats of vaporization, fusion and sublimation of a substance reflect the a) density of the substance. b) magnitudes of the boiling and melting points of the substance. c) strength of the covalent bonds between atoms in each molecule of the substance. d) strength of the intermolecular forces of the substance.

d) strength of the intermolecular forces of the substance.