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• CHEM101_MH_V4
• Topic 9: Properties of Gases
Started on Friday, April 15, 2022, 7:51 PM
State Finished
Completed on Friday, April 15,
... [Show More] 2022, 8:09 PM
Time taken 17 mins 47 secs
Grade 115.00 out of 115.00 (100%)
Question 1
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The nineteenth century chemists arranged elements in the periodic table according to increasing
Select one:
a. atomic number.
b. number of electrons.
c. atomic mass.
d. number of neutrons.
e. nuclear binding energy.
Question 2
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Which one of these ions is not isoelectronic with Kr?
Select one:
a. As3+
b. Se2–
c. Rb+
d. Sr2+
e. Br–
Question 3
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Elements with ________________ first ionization energies and ___________ electron affinities generally form cations.
Select one:
a. low, very negative
b. high, positive or slightly negative
c. low, positive or slightly negative
d. high, very negative
e. None of these is generally correct.
Question 4
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Which ground-state ion does not have an electron configuration described by the following orbital diagram?
[Ar] ↿ ↿ ↿ ↿
4s 3d
Select one:
a. V+
b. Cr2+
c. Mn3+
d. Co5+
e. Fe4+
Question 5
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An element with the electron configuration [noble gas]ns2(n – 1)d8 has ___________ valence electrons.
Select one:
a. 2
b. 6
c. 8
d. 10
e. None of these choices is correct.
Question 6
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Which pair of ions exhibits the greatest attractive force between them?
Select one:
a. Na+ and Cl–
b. Ca2+ and Cl–
c. Na+ and S2–
d. Al3+ and Mg2+
e. Mg2+ and O2–
Question 7
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Which of the following is an amphoteric oxide?
Select one:
a. Na2O
b. MgO
c. Al2O3
d. SO2
e. Cl2O7
Question 8
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In the best Lewis structure for the fulminate ion, CNO–, what is the formal charge on the central nitrogen atom?
Select one:
a. +2
b. +1
c. 0
d. –1
e. –2
Question 9
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Which of the following contains ionic bonding?
Select one:
a. CO
b. SrF2
c. Al
d. OCl2
e. HCl
Question 10
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What is the formal charge on phosphorus in a Lewis structure for the phosphate ion that satisfies the octet rule?
Select one:
a. –2
b. –1
c. 0
d. +1
e. +2
Question 11
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How many dots does the Lewis dot symbol for sodium have around it?
Select one:
a. 1
b. 2
c. 0
d. 3
e. 7
Question 12
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What formal charge resides on the carbon of CO32–?
Select one:
a. 0
b. +1
c. +2
d. +3
e. +4
Question 13
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Which of these compounds is most likely to be ionic?
Select one:
a. NCl3
b. BaCl2
c. CO
d. SO2
e. SF4
Question 14
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Which is true concerning the dipole moment of a CO2 molecule?
Select one:
a. The dipole moment is zero because the C–O bond is nonpolar.
b. The dipole moment is zero because the molecule is linear.
c. The dipole moment is zero because the molecule is bent.
d. The dipole moment is nonzero because the molecule is linear.
e. The dipole moment is nonzero because the molecule is bent.
Question 15
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What is the total number of electron domains around the central atom for a molecule having a trigonal pyramidal molecular geometry, such as NH3?
Select one:
a. 5
b. 2
c. 3
d. 4
e. 6
Question 16
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What is the molecular geometry of SiF62– as predicted by the VSEPR model?
Select one:
a. trigonal bipyramidal
b. octahedral
c. tetrahedral
d. seesaw
e. square pyramidal
Question 17
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Using the VSEPR model, what is the predicted molecular geometry of the PCl3 molecule?
Select one:
a. linear
b. bent
c. trigonal planar
d. trigonal pyramidal
e. tetrahedral
Question 18
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The nitrosonium ion, NO+, forms a number of interesting complexes with nickel, cobalt, and iron. According to molecular orbital theory, which statement about NO+ is correct?
Select one:
a. NO+ has a bond order of 2 and is paramagnetic.
b. NO+ has a bond order of 2 and is diamagnetic.
c. NO+ has a bond order of 3 and is paramagnetic.
d. NO+ has a bond order of 3 and is diamagnetic.
e. NO+ has a bond order of 2.5 and is neither paramagnetic nor diamagnetic.
Question 19
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What is the molecular geometry of HOF as predicted by the VSEPR model?
Select one:
a. trigonal pyramidal
b. bent
c. tetrahedral
d. linear
e. trigonal planar
Question 20
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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 21
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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 22
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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 23
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A gas sample occupies 8.76 L at a temperature of 37°C. What is the volume if the temperature is lowered to 0°C at constant pressure?
Select one:
a. 9.95 L
b. 0 L
c. 4.22 L
d. 74.1 L
e. 7.71 L
Question 24
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The Kelvin temperature scale is useful when comparing
Select one:
a. various gas samples at different densities.
b. volume of a gas sample with temperature at constant pressure.
c. pressure of gas samples at different volumes and constant temperature.
d. various liquids at constant pressure.
Question 25
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A sample of gas occupies 24.5 L at a pressure of 1.57 atm. What is the pressure if the volume is increased to 48.3 L at constant temperature?
Select one:
a. 0.796 atm
b. 1.26 atm
c. 3.10 atm
d. 5.38 × 10–4 atm
e. 1.86 × 103 atm [Show Less]