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Chem 110 Fall 2011 Exam II Whelan
SID Last Key First Answer
Question 1 To answer the questions, interpret the following Lewis diagram for SO 2 8 Points (^) a) The number of lone pair on central atom b) The number of single bond c) The number of double bond d) The number of equivalent Lewis structures Question 2 8 Points
Draw a Lewis structure for each of the following where the central atom obeys the octet rule. CN -^ F 2 CO
ClO 3 -^ NH (^3)
Question 3 6 Points
On the rough work paper provided – draw a Lewis structure for CO 2 in which the central C atom obeys the octet rule, and answer the questions on the right based on your drawing.
a) The number of unshared pairs ( lone pairs ) on the central C atom is: b) The central C atom forms single bonds. c) The central C atom forms double bonds.
Question 4 Draw a Lewis structure for each of the following organic molecules. 8 Points (^) CH 3 OCH 2 CH 3 HCOOH
CH 3 CONH 2 C 3 H 6
Question 5 NO 2 Cl has resonance structures – draw them. 6 Points
Question 6 8 Points
What is the name of the compound with the formula: a) NF 3 b) P 4 O 10
What is the formula for: a) sulfur hexafluoride b) Nitrogen monoxide
Question 7 6 Points
What is the bond angle about: a) 1 : b) 2 : c) 3 :
Question 8 6 Points
What is the bond angle about the following atoms? C O N
Question 9 4 Points
HNO 2 (aq) + OH - (aq) NO 2 - (aq) + H 2 O(l) K = 4.50x10 10 at 298K. Assuming you start with equal concentrations of HNO 2 and OH - , and no NO 2 -^ is initially present, circle those of the following that best describes the equilibrium system? a) The forward reaction is favored at equilibrium. b) Appreciable quantities of all species are present at equilibrium. c) The reverse reaction is favored at equilibrium. d) Very little OH -^ will be present at equilibrium. e) The concentration of NO 2 -^ will be approximately equal to the HNO (^2) concentration at equilibrium.
Question 15 6 Points
Consider the following system at equilibrium at 573 K: 2 NO(g) + Cl 2 (g) 2 NOCl(g) + 18.4 kcal If the temperature of the equilibrium system is suddenly decreased : The reaction must: a) Run in the forward direction. b) Run in the reverse direction. c) Remain the same.
The concentration of Cl 2 will: a) Increase b) Remain the same c) Decrease
Question 16 4 Points
In our discussion on the consequences of molecular polarity , the depiction below was used to discuss:
a) Fabric softeners b) Micelle actions c) Membranes d) The dissolution process
e) Detergents f) EDTA use in salad dressings g) Lead poisoning h) Chelating therapy.
Exam II Score
