16167632
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Quiz von Princess Stark, aktualisiert more than 1 year ago
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Erstellt von Princess Stark
vor fast 6 Jahre
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Frage 1
Frage
Give the number of nonbonding lone pairs electrons in H2NOH
Antworten
-
0
-
1
-
2
-
3
-
4
Frage 2
Frage
The compound methyl amine, CH3NH2, contains a C-N bond. In this bond, which of the following best describes the change on the nitrogen atom ?
Antworten
-
slightly positive
-
-1
-
+1
-
unchanged
-
slightly negative
Frage 3
Frage
Which of the compounds below have bonds that are predominantly ionic?
Antworten
-
NH3
-
KCl
-
CF4
-
both a and B
-
both b and c
Frage 4
Frage
What type of bonding is most important in CH3CH2CH2CH2CH2CH3?
Antworten
-
covalent
-
ionic
-
hydrogen
-
polar
Frage 5
Frage
Which of the following contains polar covalent bonds ?
Antworten
-
NH2
-
Na2O
-
KF
-
H2
-
both a and c
Frage 6
Frage
Which of the following covalent bonds has the largest dipole moment ?
Antworten
-
H-N
-
C-O
-
H-F
-
C-C
-
C-H
Frage 7
Frage
Which of the following elements does this electronic configuration represent 1s2 2s2 2p5?
Antworten
-
C
-
Al
-
N
-
F
-
O
Frage 8
Frage
The formal charge on the nitrogen in the compound below is
Antworten
-
+2
-
+1
-
-2
-
0
-
-1
Frage 9
Frage
which of the following is the most likely electronic structure for C2H2 ?
Antworten
-
H-C-C-H
Frage 10
Frage
Which of the following structures, including formal charges, is correct for diazomethane, CH2N2?
Antworten
Frage 11
Frage
What are the formal charge on nitrogen and the starred oxygen atom in the following molecule ?
Antworten
-
N=+1 , O=0
-
N=-1, O=0
-
N=-1, O=-1
-
N=+1, O=-1
-
N=+1 , O=+1
Frage 12
Frage
How many unpaired electrons are present in the isolated carbon atom (atomic number =6) ?
Antworten
-
none
-
one
-
two
-
three
-
four
Frage 13
Frage
Give the formal charge on nitrogen in NH4.
Antworten
-
-2
-
-1
-
0
-
+1
-
+2
Frage 14
Frage
Which of the following is the electronic configuration of the element Fe?
Antworten
-
1s2 2s2 2p6 3s2 3p6 4s2 4d6
-
1s2 2s2 2p6 3s2 3p8 3d6
-
1s2 2s2 2p6 3s2 3p6 4s2 3d6
-
1s2 2s2 2p8 3s2 3p6 4s2 3d6
Frage 15
Frage
The atomic number of boron is 5. The correct electronic configuration of boron is
Antworten
-
2s2 2p3
-
1s2 2s3
-
1s2 2p3
-
1s2 2s2 2p1
-
1s2 2s2 3s1
Frage 16
Frage
Give the electronic configuration of N-3
Antworten
-
1s2 2s2 2p6
-
1s2 2s2 2p3
-
1s2 2s2
-
1s2 2s2 2p6 3s1
-
1s2 2s2 2p4
Frage 17
Frage
Convert the model below into skeletal structure
Antworten
-
1
-
II
-
III
-
IV
-
V
Frage 18
Frage
Propanol is a compound detected on the surface of comet 67P by the Philae Lander. How many hydrogen atoms are present at the indicated Carbon?
Antworten
-
0
-
1
-
2
-
3
-
4
Frage 19
Frage
Which of the following is not a conjugate acid-base pair?
Antworten
-
H2SO4-, H2SO4
-
H2O, HO-
-
-OH, O2-
-
H2O, H3O+
-
NO3-, NO2-
Frage 20
Frage
Which of the following is the strongest acid ?
Antworten
-
CH3NH3+
-
CH3NH2
-
CH3OH
-
CH3OH2+
-
H2N-
Frage 21
Frage
The pKa of CH3COOH is a 4.8 and the pKa of HCOOH is 3.8. Given the information, one knows that
Antworten
-
CH3COOH completely ionizes in water
-
CH3COOH reacts with HO- while HCOOH does not
-
HCOOH is a weaker acid than CH2COOH
-
HCOOH reacts with HO- CH3COOH does not
-
HCOO- is a weaker base than CH3COO-
Frage 22
Frage
Identify the compound with the highest pKa
Antworten
-
CH3NH2
-
CH3NH3+
-
CH3OH
-
CH3COOH
-
H2O
Frage 23
Frage
what is the product formed from the following acid-base reaction when ammonia functions as a base? The equilibrium lies far to the reactants
Antworten
-
CH2OH + +NH3
-
CH4 +NH2OH
-
CH3NH2 +H2O
-
CH3O- + +NH4
-
CH3OH2+ + -NH2
Frage 24
Frage
Identify the compound with the highest pKa
Antworten
-
HCCN
-
CH3NH2
-
CH2CH2
-
CH3CH3
-
CH3OH
Frage 25
Frage
When a small amount of hexanoic acid [CH3(CH2)4CO2H, pka -4.8], is added to a separator funnel which contains the organic solvent diethyl ether and water with a pH of 2.0, it is found mainly in the ____ phase as ______.
Antworten
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ether; CH3(CH2)4CO2H
-
water; CH3(CH2)4CO2-
-
ether; CH3(CH2)4CO2-
-
water; CH3(CH2)4CO2H
-
none of the above
Frage 26
Frage
When a small amount of hexanoic acid [CH3(CH2)4CO2H, pka -4.8], is added to a separate funnel which contains the organic solvent diethyl ether and water with a pH of 12.0, it is found mainly in the ____ phase as ______.
Antworten
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water; CH3(CH2)4CO2-
-
water; CH3(CH2)4CO2H
-
ether; CH3(CH2)4CO2-
-
ether; CH3(CH2)4CO2H
-
none of the above
Frage 27
Frage
The conjugate acid of H2O is
Antworten
-
H3O+
-
HO-
-
H2O+
-
H3O-
-
H3O
Frage 28
Frage
H-A is an acid with a pka of 4.5. Which of the following statements about an aqueous solution of H-A is true?
Antworten
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at pH= 5.5, the solution contains about 90% A- and 10% H-A.
-
At pH= 3.5, the solution contains about 90% A- and 10% H-A
-
At pH= 6.5, the solution contains about 80% A- and 20% H-A.
-
at pH=4.5, the solution contains much more A- than H-A.
-
at pH= 4.5, the solution contains much more H-A than A-.
Frage 29
Frage
Which of the following ions is the strongest acid?
Antworten
-
H30+
-
HSO4-
-
HO-
-
H-
-
H2)
Frage 30
Frage
What would be the conjugate base in the following acid base reaction
Antworten
-
CH3S-
-
H2O
-
CH2O
-
CH3SH2+
-
CH3OH
Frage 31
Frage
What would be the conjugate acid in the following acid base reactions
Antworten
-
CH3S-
-
CH2O
-
CH3OH
-
H2O
-
CH3SH2+
Frage 32
Frage
Which of the following species cannot function as a lewis Acid ?
Antworten
-
H2O
-
TiCl4
-
AlCl3
-
NH4+
-
H+
Frage 33
Frage
What is the conjugate acid of NH3 ?
Antworten
-
+NH4
-
-NH
-
-NH2
-
+NH2
-
+NH3
Frage 34
Frage
What is the conjugate acid of CH3NH2?
Antworten
-
CH3NH-
-
CH3NH3+
-
NH4+
-
NH2-
Frage 35
Frage
What is the conjugate base of CH3NH2?
Antworten
-
NH4+
-
CH3NH-
-
NH2-
-
CH3NH3+
Frage 36
Frage
Ar there any conditions under which a student may work alone ?
Antworten
-
maybe
-
yes
-
no
-
students may work unrestricted at their convenience
Frage 37
Frage
In case of an emergency in the lab, who should be notified ?
Antworten
-
instructor
-
anybody
-
SOuthern University Police
-
a friend
Frage 38
Frage
What precautions are needed with long hair and breads?
Antworten
-
must be shampooed
-
keep long hair tied back/ keep hair away from flames
-
no precautions are necessary
-
no long hair and/ or beards allowed in laboratory
Frage 39
Frage
What should be the very last function performed in the laboratory before you leave?
Antworten
-
make sure that your locker is secure
-
wash your hands
-
bid the instructor farewell
-
arrange a time with you laboratory partner for lunch
Frage 40
Frage
What should be worn in a laboratory at all times?
Antworten
-
contact lenses
-
mask
-
a cap
-
safety glasses
Frage 41
Frage
When adding a solid metal to water, the metal will:
Antworten
-
dissolve
-
displace its volume
-
lower the liquid volume
-
form a homogenous mixture
Frage 42
Frage
Why is smoking not permitted in the lab ?
Antworten
-
it is bad for your health
-
the laboratory could be blown up
-
it is inconvenient
-
there are no ash trays in the lab
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