Chem 1010 - General Chemistry 1 » Summer 2021 » Exam 2 (B)

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Question #1
What is the molecular geometry of TeCl 4?
A.   square pyramidal
B.   seesaw
C.   square planar
D.   tetrahedral
Question #2
How many of the following molecules have sp 3 hybridization on the central atom? XeCl 4 CH 4 SF 4 C 2H 2
A.   1
B.   2
C.   4
D.   3
E.   0
Question #3
How many of the following molecules have sp 3d hybridization on the central atom? SiCl 4 BrF 5 AsF 5 BrF 3
A.   2
B.   1
C.   3
D.   0
E.   4
Question #4
In the best Lewis structure for NO   +, what is the formal charge on the N atom?
A.   +2
B.   +1
C.   0
D.   -1
Question #5
Choose the bond below that is the  weakest.
A.   K-Br
B.   C=O
C.   C≡O
D.   C-I
E.   N≡N
Question #6
How many valence electrons does an atom of Al possess?
A.   2
B.   8
C.   5
D.   1
E.   3
Question #7
Choose the statement that is TRUE.
A.   Core electrons are the easiest of all electrons to remove.
B.   Valence electrons are most difficult of all electrons to remove, and outer electrons efficiently shield one another from nuclear charge.
C.   Outer electrons efficiently shield one another from nuclear charge.
D.   Core electrons effectively shield outer electrons from nuclear charge.
E.   Valence electrons are most difficult of all electrons to remove.
Question #8
Which of the following processes is endothermic?
A.   the condensation of water
B.   an atom emits a photon
C.   the electron affinity of a fluorine atom
D.   an atom absorbs a photon
E.   None of the above processes are endothermic.
Question #9
A 50.0-g sample of liquid water at 25.0°C is mixed with 29.0 g of water at 45.0°C. The final temperature of the water is __________°C.
A.   32.3
B.   102
C.   142
D.   27.6
E.   35
Question #10
Which statement is FALSE?
A.   An exothermic reaction gives heat off heat to the surroundings.
B.   Enthalpy is the sum of a system's internal energy and the product of pressure and volume.
C.   ΔErxn is a measure of heat.
D.   ΔHrxn is the heat of reaction.
E.   Endothermic has a positive ΔH.

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