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WorksheetsCHEM 122 Test 1 (Ch 12 and 13)
Total questions: 20
Worksheet time: 30mins
Which of the following quantities is generally not obtainable from a single heating or cooling curve of a substance, measured at atmospheric pressure
melting point
boiling point
triple point
heat of fusion
heat of vaporization
The phase diagram for xenon has a solid-liquid curve with a positive slope. Which of the following is true?
solid xenon has a higher density than liquid xenon
solid xenon has the same density as liquid xenon
the phase diagram cannot be used to predict which phase of xenon is denser
freezing xenon is an endothermic process
Diethyl ether has a high vapor pressure which makes it a potential fire hazard in laboratories in which it is used. How much energy is released when 100.0 g is cooled from 53.0 oC to 10.0 oC
Boiling Point: 34.5 oC
Heat of vaporization: 351 J/g
specific heat capacity, (CH3)2O (l): 3.74 j/gK
specific heat capacity, (CH3)2O (g): 2.35 J/gK
10.1 kJ
13.1 kJ
16.1 kJ
45.2 kJ
48.6 kJ
Octane has a vapor pressure of 40 torr at 45.1 oC and 400 torr at 104.0 oC. What is its heat of vaporization?
39.0 kJ/mol
46.0 kJ/mol
590 kJ/mol
710 kJ/mol
Neon atoms are attracted to each other by
dipole-dipole forces
dispersion forces
hydrogen bonding
covalent bonding
In hydrogen iodide _____ are the most important intermolecular forces
dipole dipole
dispersion
hydrogen bonding
covalent bonds
Which of the following atoms should have the greatest polarizability?
F
Br
Po
Pb
The strongest intermolecular interactions between ethyl alcohol (CH3CH2OH) molecules arise from
dipole-dipole
dispersion
hydrogen bonding
ion-dipole
Which of the following should have the highest boiling point?
CF4
CCl4
CBr4
CI4
Which of the following should have the highest surface tension at a given temperature?
CH4
CF4
CCl4
CI4
Which of the following terms refers to the resistance of liquid to flow?
surface tension
capillary action
viscosity
adhesion
The energy gap between the conduction band and the valence band is large for
conductors
semiconductors
insulators
super conductors
Select the type of interaction that best describes the attraction between Mg2+ ions and water molecules.
dipole-dipole
dipole-induced dipole
ion-dipole
ion-induced dipole
Soda drinks bubble when the bottle is opened because
the temperature of the soda increases
exposure to atmospheric pressure squeezes the carbon dioxide from solution
the partial pressure of carbon dioxide above the solution is reduced
atmospheric nitrogen molecules displace carbon dioxide molecules
What is the molality of a solution prepared by dissolving 86.9 g of diethyl ether, C4H10O, in 425 g of benzene, C6H6
0.362 m
0.498 m
2.01 m
2.76 m
The mole fraction of potassium nitrate in an aqueous solution is 0.0194. The solution's density is 1.0627 g/mL. Calculate the molarity of the solution
0.0194 M
0.981 M
1.05 M
1.96 M
Colligative properties depend on
the chemical properties of the solute
the chemical properties of the solvent
the masses of the individual ions
the number of particles dissolved
From the following list of aqueous solutions and water, select the one with the lowest freezing point.
0.75 m (NH4)3PO4
1.0 m CaSO4
1.0 m LiClO4
1.5 m CH3OH
Human blood has a molar concentration of solutes of 0.30 M. What is the osmotic pressure of blood at 25 oC?
0.012 atm
0.62 atm
6.8 atm
7.3 atm
An emulsion is a dispersion consisting of a
solid in a liquid
liquid in a liquid
gas in a liquid
liquid in a solid
