Download chemistry 101 spring 2002 part 1

NAME _______________________________________________
CHEMISTRY 101
EXAM 3
FORM A
SPRING 2002
SECTIONS 501-509
DR. KEENEY-KENNICUTT
Directions: (1) Put your name, S.I.D. number and signature on the free response part of the exam where indicated.
(2) Each multiple choice question is actually 2 questions on your scanning sheet. If you are sure of an
answer, put the same answer down for both questions for 5 pts. If you cannot decide between two
answers, put one answer down for one question and the other answer down for the other question.
If you get one correct you'll get half credit for 2.5 pts. If there is an ambiguous multiple choice
question, use the last page to explain your answer.
(3) Do NOT write on the envelope.
(4) Bubble in OPTION A on the scanning sheet IF you want your grade posted.
(5) When finished, put the free response answers in the envelope with the scanning sheet. You can
keep the multiple choice part - the answers will be given to you as you leave.
(6) There are a total of 28 questions (16 actual questions).
PART 1
1&2. Which statement is correct?
(a) The atomic number of zinc is 65.
(b) The most stable ion of sulfur is S3−.
(c) A magnesium atom is larger than a sodium atom.
(d) The sodium cation is larger than the sodium atom.
(e) Fluorine has a more negative electron affinity than lithium.
3&4.In the reaction: HCO3− + H3O+ → H2CO3 + H2O
the two Bronsted acids are ....
(a) HCO3− and H2CO3
(b) HCO3− and H2O
(c) H3O+ and HCO3−
(d) H3O+ and H2CO3
(e) H3O+ and H2O
5&6. Arrhenius defined a base as:
(a) an electron pair donor
(b) a hydroxide ion source in water
(c) an electron pair acceptor
(d) a hydrogen ion source in water
(e) a proton acceptor
 Keeney-Kennicutt, 2002
A1
7&8 Consider the ion, 28Al3+. The number of fundamental particles in the ion is
(a) 28 protons, 31 electrons and 28 neutrons
(b) 13 protons, 13 electrons and 15 neutrons
(c) 13 protons, 16 electrons and 15 neutrons
(d) 15 protons, 12 electrons and 28 neutrons
(e) 13 protons, 10 electrons and 15 neutrons
9&10. Which of the following bonds is classified as nonpolar covalent?
(a) C-Cl
(b) Na-Cl
(c) C-P
(d) Sr-Cl
(e) C-I
11&12. Which of the following processes is associated with the ionization energy of an atom?
(a) Cl(g) → Cl+(g) + e−
(c) Cl2(g) → 2Cl(g)
(b) Cl−(g) → Cl(g) + e−
(d)
Cl+(g) + e− → Cl(g)
(e) Cl(g) + e− → Cl−(g)
13&14. In 1 mole of H3PO4, there are ______ equivalents of the acid.
(a) 3
 Keeney-Kennicutt, 2002
(b) 2
(c) 1
(d) 1/2
(e) 1/3
A2
15&16. Which of the following molecular shapes has 5 atoms and 1 lone pair of electrons located around the
central atom?
(a) see-saw
(b) square planar
(c) trigonal bipyramidal
(d) square pyramidal
(e) T-shaped
17&18. According to Valence Bond Theory and Valence Shell Electron Pair Repulsion Theory, if the hybridization
at an atom is sp2, the electronic geometry of the molecule at that atom is
(a) linear
(b) trigonal planar
(d) trigonal bipyramidal
(e) octahedral
(c) tetrahedral
19&20. Which of these three molecular species, if any, are polar?
NH3
XeF4
H2S
(a) NH3 only
(b) H2S and NH3 only
(d) all are polar
(e) none are polar
(c) H2S only
OVER ⇒
 Keeney-Kennicutt, 2002
A3
21&22. If 50.0 mL of 2.00 M HNO3 solution is added to 15.0 mL of 4.00 M Ba(OH)2, the resulting solution
will be _________ M in Ba(NO3)2.
(a) 0.065 M
(b) 0.31 M
(c) 0.77 M
(d) 0.42 M
(e) 0.55 M
23&24. What volume of 0.300 N H3PO4 is required to completely neutralize 0.400 g of Mg(OH)2?
(a) 24.0 mL
 Keeney-Kennicutt, 2002
(b) 12.0 mL
(c) 58.7 mL
(d) 45.7 mL
(e) 35.7 mL
A4
CHEMISTRY 101
SPRING 2002
NAME
EXAM 3
S 501-509
ID
Signature
Form A
PART 2
(24 pts) 25.
For each of species, draw the Lewis dot structure (2 pts and don't forget all the electrons). For the
central atom, give the number of regions of high electron density (2 pts), the hybridization (2 pts),
electronic geometry (2 pts), the molecular (or ionic) geometry (2 pts), and say if the species has a
dipole moment (is polar) or not (2 pt).
+
(a) SF3
(b) BrF3
+
SF3
BrF3
-
Regions of High e Density
Hybridization
Electronic Geometry
Molecular Geometry
Has dipole moment (yes/no)
(4 pts) Draw a 3-dimensional representation of these 2 species using wedges and dotted lines. Show all lone pairs
of electrons.
+
(a) SF3
(b) BrF3
OVER ⇒
 Keeney-Kennicutt, 2002
A5
26. Circle which acid is stronger (1 pts) and explain why? Use the concept of bond strength.(3 pts)
(4 pts)
HBrO3 and HClO3
27. Draw appropriate Lewis dot structures for all the resonance structures of the nitrite ion.
(4 pts)
28.
Consider the organic compound to the right. This is Claritin,
an antihistamine.
(2 pts)
(a)
How many sigma bonds are present? ___________
(2 pts)
(b)
How many pi bonds are present? _______________
(EXTRA
CREDIT
2 pts)
(c)
How many lone pairs of electrons are present
in the entire molecule? _____
 Keeney-Kennicutt, 2002
A6
SCRAP PAPER OR COMMENTS ON EXAM
CHEMISTRY 101
Spring 2002
EXAM 3 Form A
S 501-509
 Keeney-Kennicutt, 2002
NAME
A7