Chemistry: The Molecular Nature of Matter and Change (Silberberg), 7th Edition

Chapter 12: Intermolecular Forces: Liquids, Solids, and Phase Changes

Self-Assessment Quiz 1

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1
How many grams of 0oC ice can be converted into 0oC liquid water by the addition of 100. kJ of heat energy? (ΔH°fus= 6.02 kJ/mol)
A)299 g
B)2.46 g
C)18.6 g
D)44.2 g
E)23.9 g
2
The vapor pressure of ethanol is 100 mmHg at 34.9oC. Its molar heat of vaporization is 39.3 kJ/mol. What is the vapor pressure of ethanol in mmHg at 57.5oC?
A)623 mmHg
B)286 mmHg
C)173 mmHg
D)118 mmHg
E)none of the above
3
Supercooling is
A)the lowering of the boiling point of a liquid by adding a solute.
B)the lowering of the melting point of a liquid by adding a solute.
C)the lowering of the temperature of a liquid by adding a solute.
D)when a substance is in the liquid state despite being below its freezing point.
E)when a liquid is cooled at an accelerated rate.
4
Which of the following should have the highest boiling point?
A)CH4
B)CH3OH
C)NH3
D)CH3Br
E)Ne
5
Which of the following exhibits the most hydrogen bonding?
A)LiH
B)CH4
C)NH3
D)H2S
E)CH2F2
6
Formaldehyde (OCH2) can hydrogen bond with water. What is the maximum number of hydrogen bonds in which a single formaldehyde molecule can participate?
A)2
B)3
C)4
D)5
E)6
7
Which of the following carbon compounds has the highest melting point?
A)CF4
B)CCl4
C)CBr4
D)CI4
E)CH4
8
Which of the following liquids would have the highest viscosity at a particular temperature?
A)CH2Br2
B)C2H5OH
C)CH3Cl
D)HOCH2CH2OH
E)CH3OCH3
9
Water has such a high specific heat because
A)it has such a low molecular weight.
B)it is rather dense.
C)the O-H single bond has a high bond energy.
D)it has many relatively strong hydrogen bonds.
E)it dissolves both ionic and covalent compounds.
10
In a structure with a cubic unit cell, how many unit cells "share" each corner atom of the cube?
A)10
B)8
C)6
D)4
E)2
11
Calculate the volume effectively occupied by a single CsCl ion pair in the crystal given that the density of crystalline CsCl is 3.988 g/cm3.
A)0.251 cm3
B)7.01 × 10-23 cm3
C)3.93 × 10-26 cm3
D)42.2 cm3
E)none of the above
12
Vanadium crystallizes in a body-centered cubic lattice. What is the number of nearest neighbors (atoms that make contact) around each atom in this lattice?
A)2
B)4
C)6
D)8
E)It depends on whether the atom is a corner atom or a central atom.
13
In SiO2
A)the valence band is the same as the conduction band.
B)the two bands are filled with electrons.
C)the valence band and the conduction band are separated by a large energy gap.
D)the strong Si-O bond prevents the flow of electrons.
E)double bonds between Si and O are responsible for making it a semiconductor.
14
Which of the following has the greatest electrical conductivity?
A)Cu
B)Fe
C)Pure Ge
D)Ge doped with In
E)Al2O3
15
Which of the following correctly identifies the product formed when silicon is doped with a group 5A(15) element?
A)semiconductor
B)metal
C)n-type semiconductor
D)insulator
E)p-type semiconductor
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