Chem 131
Mixon
Name________________________________
Exam 3 – Take Home Portion
Due November 15th , 2004 in class
TAKE-HOME EXAM STATEMENT OF ACADEMIC HONESTY
(this statement MUST be signed and turned in with the exam in order to receive credit for this exam)
I declare that the answers contained within this exam are mine and mine alone. I agree that
while I may work on this exam with text resources, I may NOT seek help or guidance from any
other person. This includes current students, former students, students in other classes,
scientists, relatives, industry personnel, and anybody else in the universe. The only person I
may ask questions of is my instructor, April Mixon, however I understand that she reserves the
right to not provide me with answers to my questions. I understand that the answers that I put
down on this exam must be my own, in my own words, created by me.
I further understand that if I submit answers that are too similar to another person’s in
this class, or are downright plagiarized from any other person or source (printed or electronic),
that I will receive a zero on this exam (which will be included, in the total score, with my grade
on the in-class portion of the final exam). I also understand that if I fail to show my work, I will
receive no credit for my answers. This means that if a number is NOT given to me on the exam,
I understand that I need to show where my calculated number came from.
Signed:_____________________________________________________________________
Exam 3 – CH131
1
Note: structures means plural!!!
1.) Draw the Lewis resonance structures for H2CO3 (no O-O bonds, no H-C bonds). Using formal
charge, expanded valence shells, and resonance where applicable, choose the structure(s) that
contribute more to the overall resonance hybrid. (4 pts)
2.) Draw the Lewis resonance structures for H2SO4 (no H-S bonds, no O-O bonds). Using formal
charge, expanded valence shells, and resonance where applicable, choose the structure(s) that
contribute most to the overall resonance hybrid. (7.5 pts)
Exam 3 – CH131
2
3.) Fill in the table with the appropriate information/values:
Formula
PCl5
P:
Valence e(3.5 pts)
H3PO4 (follow octet)
(no H-P bonds,
no O-O bonds)
H3PO4 (violate octet)
(no H-P bonds,
no O-O bonds)
H:
same
Cl:
P:
O:
Total:
Total:
Lewis structure
(13 pts)
P:
H:
Cl:
P:
-
e configurations
(2.5 pts)
same
O:
Identify which bonds are
polar bonds
(1.5 pts)
Formal charge calc
(4 pts)
Exam 3 – CH131
Same
P:
H:
H:
Cl1:
Cl2:
Cl3:
Cl4:
Cl5:
P:
P:
O1:
O2:
O3:
O4:
O1:
O2:
O3:
O4:
3
Oxidation # calc
(4 pts)
P:
H:
H:
Cl1:
Cl2:
Cl3:
Cl4:
Cl5:
P:
P:
O1:
O2:
O3:
O4:
O1:
O2:
O3:
O4:
BONUS:
Name
(2 pts)
Exam 3 – CH131
same
4