Biology Midterm Exam
CHEMISTRY 140A NAME (please print) â y
MIDTEHM EXAM FrRsT ' ` LAST
OCT 29, 2012
Sofomons 10”’ ed (Cp 1 - 4)
SIGNATURE v_ _
ID NUMBER g
LAST NAME OF PERSON SEAIE'D T0 YOUR RIGHT: __
LAST NAME OF PERSON SEATED T0 YOUR LEFT.'
no NOT OPEN THE EXAM UNTIL You ARE TOLD To Do so.
- Please sign your name on the top of pages 1 through 4.
- Please check that you have 5 pages (including this one; page 5 is blank for your scratch work).
- Answer only in the space provided. Do not write answers on the back ola page.
Question Points Score
I. 35
2. 20
3. 45
Total 100
H He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
K CaSCTiV CrMnFeCoNiCuZnGaGeASSeBrKr
RbSrY ZrNbMoTcRuRhPdAgCdInSnSbTeI Xe …show more content…
(5 pts) Draw 3-D Lewis structures for the two most significant resonance contńbutors of
O3 (OOO connectivity)
1b. (5 pts) Which of the following is a correct electron'dot (Lewis structure) representation of the nitrite
ion, N02- (ONO connectivity)? E
1c. (5 pts) Which of the following species ìs/are not a resonance form(s) of the anionic species in the
box? D
1d. (10 pas) Draw a single 3-Dimensional Lewis structure for the following molecule represented by a condensed formula CHBCDQOCHCHE. Be sure that the structure you draw corresponds to the major
resonance contributor.
AD ú H (91 vé
if l f’ …show more content…
Be sure to show the resonance structure(s) of the product(s) that would arise directly from the indicated movement of' electrons.
2a. (5 pts) Which of the following species is a resonance form of compound
LA YM
NAME:
2b. (3 pts) Identify the atomic orbitals in the C-N sigma bond in the oxime shown below? É
A)(zsp2,2sp2) B)(2Sp3,2sp3) C)(25p,2sp) D)(2sp2,2sp3) E) (25p, ls)
2c. (2 pts) Identify the atomic orbital that_ the lone pair electrons on N atom are contained in for
the oXime shown in problem 2b?
A) 2592 B) 25133 C) 23p D) 2s E) 2p
2d. (3 pts) Which of the following is the strongest base: _â
2e. (5 pts) For the following acid f base reaction which statement is true taking AG“ into
consideration? E
A) The reaction is an exothermic reaction and AG“ is zero.
B) The reaction is an endothermic reaction and AG” is negative.
C) The reaction is an exothermic reaction and AG“ is negative.
D) The reaction is an exothermic reaction and AGD is positive.
E) None of the above
2f. (2 pts) Which of these bases is thçâtrongest one which can be used (and retains its basic
character) in aqueous solution?
MIDTEHM EXAM FrRsT ' ` LAST
OCT 29, 2012
Sofomons 10”’ ed (Cp 1 - 4)
SIGNATURE v_ _
ID NUMBER g
LAST NAME OF PERSON SEAIE'D T0 YOUR RIGHT: __
LAST NAME OF PERSON SEATED T0 YOUR LEFT.'
no NOT OPEN THE EXAM UNTIL You ARE TOLD To Do so.
- Please sign your name on the top of pages 1 through 4.
- Please check that you have 5 pages (including this one; page 5 is blank for your scratch work).
- Answer only in the space provided. Do not write answers on the back ola page.
Question Points Score
I. 35
2. 20
3. 45
Total 100
H He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
K CaSCTiV CrMnFeCoNiCuZnGaGeASSeBrKr
RbSrY ZrNbMoTcRuRhPdAgCdInSnSbTeI Xe …show more content…
(5 pts) Draw 3-D Lewis structures for the two most significant resonance contńbutors of
O3 (OOO connectivity)
1b. (5 pts) Which of the following is a correct electron'dot (Lewis structure) representation of the nitrite
ion, N02- (ONO connectivity)? E
1c. (5 pts) Which of the following species ìs/are not a resonance form(s) of the anionic species in the
box? D
1d. (10 pas) Draw a single 3-Dimensional Lewis structure for the following molecule represented by a condensed formula CHBCDQOCHCHE. Be sure that the structure you draw corresponds to the major
resonance contributor.
AD ú H (91 vé
if l f’ …show more content…
Be sure to show the resonance structure(s) of the product(s) that would arise directly from the indicated movement of' electrons.
2a. (5 pts) Which of the following species is a resonance form of compound
LA YM
NAME:
2b. (3 pts) Identify the atomic orbitals in the C-N sigma bond in the oxime shown below? É
A)(zsp2,2sp2) B)(2Sp3,2sp3) C)(25p,2sp) D)(2sp2,2sp3) E) (25p, ls)
2c. (2 pts) Identify the atomic orbital that_ the lone pair electrons on N atom are contained in for
the oXime shown in problem 2b?
A) 2592 B) 25133 C) 23p D) 2s E) 2p
2d. (3 pts) Which of the following is the strongest base: _â
2e. (5 pts) For the following acid f base reaction which statement is true taking AG“ into
consideration? E
A) The reaction is an exothermic reaction and AG“ is zero.
B) The reaction is an endothermic reaction and AG” is negative.
C) The reaction is an exothermic reaction and AG“ is negative.
D) The reaction is an exothermic reaction and AGD is positive.
E) None of the above
2f. (2 pts) Which of these bases is thçâtrongest one which can be used (and retains its basic
character) in aqueous solution?