Download Sample Exam 1

Quam 1
Name ______________________________
1. Which is the electronic configuration that describes Mg2+?
a) 1s2, 2s2
b) 1s2, 2s2, 2p6
c) 1s2, 2s2, 2p6, 3s2
d) 1s2, 2s2, 2p6, 3s2, 3p6
2. Which ion is described by the electronic configuration 1s22s22p63s23p2?
a) Mg+
b) Al+
c) Si+
d) P+
3. The spins of the electrons must be ________________ in an orbital.
4. Outer shell electrons are called _______________ electrons.
5. Which molecules contain both covalent and ionic bonds? (Circle all that apply)
CH3OH
Na2CO3
NH4Cl
NaCl
5. Arrange the bonds in increasing order of ionic character (least first, separate by commas)
C-C
Na-O
C-N
O-H
C-O
________________________________________________________
7. Draw the correct Lewis structure for the following molecules
a) hydrazine: H4N2
b) hydrogen cyanide, HCN
c) methoxide CH3O –
d) formaldehyde H2CO
8. Which molecules are polar? (Circle all that apply)
NH 3
CO2
H2 O
CH4
Br2
9. According to VSEPR model, what is your prediction for the arrangement of electron pairs for CH3¯ ?
a) linear
b) tetrahedral
c) bent
d) trigonal
10. Nitrogen has a negative formal charge in which of the following compounds?
a) NaNH2
b) N2
c) NH4Cl
d) HCN
11. What is the hybridization of carbon in each of the following molecules?
H 2C O
H 2C CH 2
CH 4
O C O
12. A __________ bond is characterized by the unequal sharing of electrons.
H OH H
F C C C NH2
13. The most polar bond in the following molecule is __________.
1
H H H
14. Which statement about orbitals is false?
a) Orbitals are regions of space where electrons are found.
b) Orbitals may contain up to two electrons.
c) Orbitals are filled in order of decreasing energy.
d) Orbitals of equivalent energy are half filled before adding two electrons to any one of them.
15. Which statement about resonance structures is false?
a) All contributing resonance structures must have the same number of valence electrons.
b) All contributing structures must obey the rules of covalent bonding.
c) The position of nuclei may change.
d) Third period atoms may have up to 12 electrons around them.
16. Which of the following are pairs of contributing resonance structures? (Circle all that are correct)
I
CH3
II
III
O
CH3
H2C O
H2C CH CH2
IV
N C O
CH3
CH2
OH
H2C O
H2C
CH CH2
N C O
17. Name each of the following functional groups:
O
C
H3 C
H
H C C CH3
H2 N
O
C
CH3
H 3C
18. Label each of the following as 1o, 2o, 3o or 4o alcohols or amines:
CH 3
OH
CH 3
N
H3 C
CH3
CH 3CHCH 3
CH3 CH2 CH 2CHNH 2
+ H3CCO2H
CH3NH3
+
I
C2H5OH
+
NaH
C2H5ONa
+
HCl
CH3OH2
V
2
H2
IV
III
CH3OH
CH3CO2
II
+
+
O
CH 3
CH 3
H 3C N CH 3
CH 3
19. Circle the conjugate bases in the following reactions.
CH3NH2
O
C
Cl
VI
20. Circle the conjugate acids in the following reactions.
CH3NH2
+ CH3CO2H
CH3NH3
+
CH3CO2
I
CH3OH
+
II
CH3OH2
HCl
+
IV
III
+
C2H5OH
C2H5ONa
NaH
Cl
+
H2
VI
V
21. Arrange the following in order of increasing basicity (weakest to strongest).
OH-
Cl-
H2O
NH3
___________________________________________________________________
22. Which statements about acid-base equilibria are true? (Circle all that apply)
I. The pKA is the negative log10 of the acid equilibrium constant.
II. A stronger acid has a pKA with a smaller value than a weaker acid.
III. A stronger base has a conjugate acid which has a pKA with a smaller value than a weaker base.
IV. The KA = K [HA].
23. Which ion is the strongest base?
O
a)
CH3CH2O
b)
CH3
C
O
c) Cl
d) CH3CH2
24. Which equilibria lie considerably toward the right? (Circle all that apply)
O
C
I.
H3C
O
OH
+
NH3
C
H3C
O
II.
C
H3C
O
+
NH4
O
O
+
C
H2O
H3C
OH
+
OH
III.
NH4
+
OH
NH3
+
H2O
IV.
HCN
+
OH
CN
+
H2O
3
25. Which equilibria lie considerably toward the left? (Circle all that apply)
O
O
C
I.
H3C
CN
+
OH
C
H3C
O
II.
C
+
O
NH4
C
NH4
+
OH
H3C
OH
NH3
O
IV.
HCN
O
H3C
III.
+
O
+
NH3
+
H2O
+
CH3OH
O
C
OH +
H3C
C
CH3
O
H3C
26. List the bonds in order of increasing acidity (least to most).
C H
O H
F H
N H
____________________________________________________________________
27. What is the stronger acid in the following reaction if the equilibrium constant is approximately 108.
HC
CH
+ NH2
a)
HC C
b)
+
NH3
c)
d)
28. Which is the order of decreasing acid strength of the following compounds (greatest first, use A-D to symbolize)?
O
C
O
A.
Cl
B.
C
Br
CH 2 OH
CH2
O
C. F
OH
D. H
C
CH 2 OH
O
C
CH 2 OH
________________________________________________________________________
29. The weaker the acid, the ________________ the conjugate base.
30. The higher concentration (reactants or products) at equilibrium will lie on the side of the ___________ acid.
31. Complete the following reaction.
O
CH3COH
O
+
CH3CO-
H2O
+
32. Complete the following reaction.
O
NH4Cl + CH3CONa
NH3 +
4
5