Chem 1010 - General Chemistry 1 » Summer 2021 » Exam 2

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Question #1
How many of the following molecules are polar? PCl 5 COS XeO 3 SeBr 2
A.   0
B.   4
C.   1
D.   2
E.   3
Question #2
How many of the following molecules have sp hybridization on the central atom?  C 2Cl 2 CO 2 O 3 H 2O
A.   2
B.   1
C.   4
D.   0
E.   3
Question #3
How many of the following molecules are polar?  BrCl 3 CS 2 SiF 4 SO 3
A.   4
B.   3
C.   0
D.   2
E.   1
Question #4
Which of the following statements is TRUE?
A.   Part of the Bohr model proposed that electrons in the hydrogen atom are located in "stationary states" or particular orbits around the nucleus.
B.   The uncertainty principle states that we can never know both the exact location and speed of an electron and an orbital is the volume in which we are most likely to find an electron.
C.   An orbital is the volume in which we are most likely to find an electron.
D.   The uncertainty principle states that we can never know both the exact location and speed of an electron.
E.   The emission spectrum of a particular element is always the same and can be used to identify the element.
Question #5
How many valence electrons does an atom of Al possess?
A.   8
B.   3
C.   5
D.   1
E.   2
Question #6
According to the following reaction, how much energy is required to decompose 55.0 kg of Fe 3O 4? The molar mass of Fe 3O 4 is 231.55 g/mol.  Fe 3O 4(s) → 3 Fe(s) + 2 O 2(g) ΔH° rxn = +1118 kJ 
A.   1.10 × 106 kJ
B.   3.44 × 104 kJ
C.   2.38 × 102 kJ
D.   1.12 × 103 kJ
E.   2.66 × 105 kJ
Question #7
A piece of iron (C=0.449 J/g°C) and a piece of gold (C=0.128 J/g°C) have identical masses. If the iron has an initial temperature of 498 K and the gold has an initial temperature of 298 K, which of the following statements is TRUE of the outcome when the two metals are placed in contact with one another? Assume no heat is lost to the surroundings.
A.   Since the two metals have the same mass, the final temperature of the two metals will be 398 K, exactly halfway between the two initial temperatures.
B.   Since the two metals have the same mass, the thermal energy contained in each metal after equilibrium will be the same.
C.   Since the two metals have the same mass, but the specific heat capacity of gold is much smaller than that of iron, the final temperature of the two metals will be closer to 298 K than to 498 K.
D.   Since the two metals have the same mass, the thermal energy contained in the iron and gold after reaching thermal equilibrium will be the same.
E.   None of the above are true.
Question #8
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.   142
B.   27.6
C.   35
D.   102
E.   32.3
Question #9
Identify the number of bonding pairs and lone pairs of electrons in N 2.
A.   3 bonding pairs and 2 lone pairs
B.   6 bonding pair and 1 lone pair
C.   2 bonding pairs and 1 lone pair
D.   4 bonding pair and 2 lone pairs
E.   2 bonding pairs and 3 lone pairs
Question #10
Choose the bond below that is  most polar.
A.   C-N
B.   N-O
C.   C-C
D.   C-F
E.   Cl-Cl

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