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• CHEM101_MH_V4
• Topic 9: Properties of Gases
Started on Thursday, March 17, 2022, 6:27 PM
State Finished
Completed on Thursday, March
... [Show More] 17, 2022, 7:27 PM
Time taken 59 mins 46 secs
Grade 101.20 out of 115.00 (88%)
Question 1
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What elements and groups have properties that are most similar to those of chlorine?
Select one:
a. F, Br, I, and nonmetals in Group 7A
b. Cl, K, C, and metals in Group 1B
c. N, P, As, and lanthanides
d. He, Ne, Xe, and nonmetals in Group 7A
e. O, S, and P
Question 2
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Which species have the most similar atomic radii?
Select one:
a. S2– and Cl–
b. Ar and As
c. Rb+ and K+
d. I– and Br –
e. Br and Cs
Question 3
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Which of these elements has the smallest first ionization energy?
Select one:
a. Cl
b. Na
c. Be
d. K
e. As
Question 4
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Which of these choices is the electron configuration for the chloride ion?
Select one:
a. [Ne]3s23p4
b. [Ne]3s23p7
c. [Ar]
d. [Ar]4s1
e. [Ne]3s23p5
Question 5
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The general electron configuration for noble gas atoms is
Select one:
a. ns2np6.
b. ns2np5.
c. ns2np4.
d. ns2np3.
e. ns2.
Question 6
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Which of the following most accurately describes the trend in metallic character?
Select one:
a. Increases from left to right across a period because the number of valence electrons increases
b. Decreases from left to right across a period because the electronegativity increases
c. Increases from top to bottom in a group because the ionization energy decreases
d. Decreases from top to bottom because the nuclear charge increases
Question 7
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Which of the following elements will form an acidic compound with hydrogen?
Select one:
a. Sodium
b. Carbon
c. Fluorine
d. Nitrogen
e. Boron
Question 8
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The Lewis dot symbol consists of the symbol for the element surrounded by dot(s). What does the dot or dots represent?
Select one:
a. Electron configuration
b. Valence electrons
c. Atomic number
d. Atomic mass
e. Core electrons
Question 9
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How many dots does the Lewis dot symbol for oxygen have around it?
Select one:
a. 4
b. 2
c. 6
d. 3
e. 7
Question 10
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The number of resonance structures for the sulfur dioxide molecule that satisfy the octet rule is
Select one:
a. 1.
b. 2.
c. 3.
d. 4.
e. none of these
Question 11
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The Lewis dot symbol consists of the symbol for the element surrounded by dot(s). What does the dot or dots represent?
Select one:
a. Electron configuration
b. Valence electrons
c. Atomic number
d. Atomic mass
e. Core electrons
Question 12
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Select the compound with the highest (i.e., most negative) lattice energy.
Select one:
a. CaS(s)
b. BaO(s)
c. NaI(s)
d. LiBr(s)
e. MgO(s)
Question 13
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The Lewis structure for CS2 is:
Select one:
a.
b.
c.
d.
Question 14
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The PCl5 molecule has
Select one:
a. nonpolar bonds, and is a nonpolar molecule.
b. nonpolar bonds, but is a polar molecule.
c. polar bonds, and is a polar molecule.
d. polar bonds, but is a nonpolar molecule.
Question 15
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Which statement is not true of molecular orbitals?
Select one:
a. The number of molecular orbitals formed is always equal to the number of atomic orbitals combined.
b. A molecular orbital can accommodate up to two electrons.
c. When electrons are added to orbitals of the same energy, the most stable arrangement is predicted by Hund's rule.
d. Low-energy molecular orbitals fill before high-energy molecular orbitals fill.
e. Antibonding molecular orbitals are higher in energy than all of the bonding molecular orbitals.
Question 16
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What is the predicted O–C–O bond angle in CO2?
Select one:
a. 60°
b. 90°
c. 109.5°
d. 120°
e. 180°
Question 17
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Using the VSEPR model, predict the molecular geometry around the central atom in PO43–.
Select one:
a. trigonal planar
b. trigonal pyramidal
c. tetrahedral
d. trigonal bipyramidal
e. octahedral
Question 18
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The hybridization of the central nitrogen atom in the molecule N2O is
Select one:
a. sp.
b. sp2.
c. sp3.
d. sp3d.
e. sp3d2.
Question 19
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Using the VSEPR model, predict the molecular geometry around the central atom in SO32–.
Select one:
a. trigonal planar
b. trigonal pyramidal
c. tetrahedral
d. trigonal bipyramidal
e. octahedral
Question 20
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What is the temperature in Celsius at 4 K, which is the normal boiling point of liquid helium?
Select one:
a. –269°C
b. 269°C
c. 277°C
d. 68.3°C
e. –277°C
Question 21
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What is the Kelvin temperature at 24°C?
Select one:
a. 249 K
b. 11.4 K
c. –297 K
d. –249 K
e. 297 K
Question 22
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What is the temperature in Celsius at 77 K, which is the normal boiling point of liquid nitrogen?
Select one:
a. –350°C
b. –196°C
c. 350°C
d. 196°C
e. 3.55°C
Question 23
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A sample of nitrogen gas is confined to a 14.0-L container at 375 torr and 37.0°C. How many moles of nitrogen are in the container?
(R = 0.08206 L • atm/K • mol, 1 atm = 760 torr)
Select one:
a. 0.272 mol
b. 2.27 mol
c. 3.69 mol
d. 206 mol
e. 227 mol
Question 24
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What is the density of carbon dioxide gas at –25.2°C and 98.0 kPa? (R = 0.08206 L • atm/K • mol, 1 atm = 101,325 Pa)
Select one:
a. 0.232 g/L
b. 0.279 g/L
c. 0.994 g/L
d. 1.74 g/L
e. 2.09 g/L
Question 25
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In the van der Waals equation, the constant a is a constant that is part of a correction factor for _________.
Select one:
a. the volume of the gas
b. the temperature of the gas
c. the pressure of the gas
d. the ideal gas constant [Show Less]