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Chem 2045 practice exam 3 Flashcards | StudBud
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Chem 2045 practice exam 3
Chem 2045 practice exam 3
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1
Use VSEPR theory to predict the molecular geometry of IF5.
see-saw
tetrahedral
square-pyramidal
trigonal-bipyramidal
2
Which of the following is a correct Lewis structure for N2O?
1
4
3
2
3
Which of the following orbitals might have ml = -2?
s and p
s
p and d
d and f
4
Place the following atoms in order of increasing atomic radii: Se, O, S, and As.
O < S < Se < As
Se < As < S < O
As < Se < S < O
O < S < As > Se
5
Which one of the following sets of quantum numbers is NOT allowed?
n = 6, l = 0, ml = 0, ms = +1/2
n = 5, l = 3, ml = 1, ms = +1/2
n = 4, l = 2, ml = -3, ms = -1/2
n = 3, l = 1, ml = -1, ms = +1/2
6
What 2+ ion has the following ground state electron configuration?
Ca^2+
Cu^2+
Co^2+
Ni^2+
7
Rank K, Li, and Cs in order of increasing first ionization energy.
Li < Cs < K
K < Cs < Li
Cs < K < Li
Cs < Li < K
8
Which of the following molecules or ions are isoelectronic: SO2, CO2, NO2-, ClO2-?
SO2 and CO2
CO2 and ClO2^-
SO2 and NO2^-
NO2^- and ClO2^-
9
One resonance structure for thiocyanate ion is drawn below. What is the formal charge on each atom?
S = 0, C = -1, N = 0
S = 0, C = +2, N = -3
S = 0, C = 0, N = -1
S = -1, C = 0, N = 0
10
Which element has the electron configuration 1s^2 2s^2 2p^6 3s^2 3p^4?
Se
Mg
Si
S
11
Use VSEPR theory to predict the molecular geometry of CS2.
linear
tetrahedral
bent
trigonal-planar
12
What is a possible set of quantum numbers for the unpaired electron in the orbital box diagram below?
n = 3, l = 1, ml = -1, ms = +1/2
n = 3, l = 2, ml = -1, ms = -1/2
n = 3, l = 2, ml = -2, ms = +1/2
n = 4, l = 1, ml = -1, ms = +1/2
13
What is the total number of valence electrons in a carbonate ion?
20
26
22
24
14
A silicon atom has ____ valence electrons.
4
0
6
2
15
Which one of the following molecules has a dipole moment (it is polar)?
SO3
PF5
CI4
NCl3
16
Which element has the following electron configuration?
O
N
P
S
17
Which of the following diagrams represent p-orbitals?
(IV) only
(I) only
(II) only
(III) only
18
How many orbitals have the following set of quantum numbers: n = 6, l = 3, ml = -2?
6
3
0
1
19
Which of the following sets of quantum numbers refers to a 4p orbital?
n = 1, l = 1, ml = -1
n = 4, l = 1, ml = 0
n = 4, l = 2, ml = -1
n = 1, l = 2, ml = -1
20
Predict which of the following compounds will have the most polar covalent bond(s).
H2S
HCl
NH3
CBr4
21
Which of the following is a correct Lewis structure for ozone, O3?
1
2
5
3
22
Which element has the electron configuration [Ar]3d^10 4s^1?
Cu
Ag
Zn
Ga
23
What is the expected number of valence electrons for an atom of a group 6A element?
2
0
1
6
