16167632
Descripción
Test por Princess Stark, actualizado hace más de 1 año
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Creado por Princess Stark
hace casi 6 años
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Pregunta 1
Pregunta
Give the number of nonbonding lone pairs electrons in H2NOH
Respuesta
-
0
-
1
-
2
-
3
-
4
Pregunta 2
Pregunta
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 ?
Respuesta
-
slightly positive
-
-1
-
+1
-
unchanged
-
slightly negative
Pregunta 3
Pregunta
Which of the compounds below have bonds that are predominantly ionic?
Respuesta
-
NH3
-
KCl
-
CF4
-
both a and B
-
both b and c
Pregunta 4
Pregunta
What type of bonding is most important in CH3CH2CH2CH2CH2CH3?
Respuesta
-
covalent
-
ionic
-
hydrogen
-
polar
Pregunta 5
Pregunta
Which of the following contains polar covalent bonds ?
Respuesta
-
NH2
-
Na2O
-
KF
-
H2
-
both a and c
Pregunta 6
Pregunta
Which of the following covalent bonds has the largest dipole moment ?
Respuesta
-
H-N
-
C-O
-
H-F
-
C-C
-
C-H
Pregunta 7
Pregunta
Which of the following elements does this electronic configuration represent 1s2 2s2 2p5?
Respuesta
-
C
-
Al
-
N
-
F
-
O
Pregunta 8
Pregunta
The formal charge on the nitrogen in the compound below is
Respuesta
-
+2
-
+1
-
-2
-
0
-
-1
Pregunta 9
Pregunta
which of the following is the most likely electronic structure for C2H2 ?
Respuesta
-
H-C-C-H
Pregunta 10
Pregunta
Which of the following structures, including formal charges, is correct for diazomethane, CH2N2?
Respuesta
Pregunta 11
Pregunta
What are the formal charge on nitrogen and the starred oxygen atom in the following molecule ?
Respuesta
-
N=+1 , O=0
-
N=-1, O=0
-
N=-1, O=-1
-
N=+1, O=-1
-
N=+1 , O=+1
Pregunta 12
Pregunta
How many unpaired electrons are present in the isolated carbon atom (atomic number =6) ?
Respuesta
-
none
-
one
-
two
-
three
-
four
Pregunta 13
Pregunta
Give the formal charge on nitrogen in NH4.
Respuesta
-
-2
-
-1
-
0
-
+1
-
+2
Pregunta 14
Pregunta
Which of the following is the electronic configuration of the element Fe?
Respuesta
-
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
Pregunta 15
Pregunta
The atomic number of boron is 5. The correct electronic configuration of boron is
Respuesta
-
2s2 2p3
-
1s2 2s3
-
1s2 2p3
-
1s2 2s2 2p1
-
1s2 2s2 3s1
Pregunta 16
Pregunta
Give the electronic configuration of N-3
Respuesta
-
1s2 2s2 2p6
-
1s2 2s2 2p3
-
1s2 2s2
-
1s2 2s2 2p6 3s1
-
1s2 2s2 2p4
Pregunta 17
Pregunta
Convert the model below into skeletal structure
Respuesta
-
1
-
II
-
III
-
IV
-
V
Pregunta 18
Pregunta
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?
Respuesta
-
0
-
1
-
2
-
3
-
4
Pregunta 19
Pregunta
Which of the following is not a conjugate acid-base pair?
Respuesta
-
H2SO4-, H2SO4
-
H2O, HO-
-
-OH, O2-
-
H2O, H3O+
-
NO3-, NO2-
Pregunta 20
Pregunta
Which of the following is the strongest acid ?
Respuesta
-
CH3NH3+
-
CH3NH2
-
CH3OH
-
CH3OH2+
-
H2N-
Pregunta 21
Pregunta
The pKa of CH3COOH is a 4.8 and the pKa of HCOOH is 3.8. Given the information, one knows that
Respuesta
-
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-
Pregunta 22
Pregunta
Identify the compound with the highest pKa
Respuesta
-
CH3NH2
-
CH3NH3+
-
CH3OH
-
CH3COOH
-
H2O
Pregunta 23
Pregunta
what is the product formed from the following acid-base reaction when ammonia functions as a base? The equilibrium lies far to the reactants
Respuesta
-
CH2OH + +NH3
-
CH4 +NH2OH
-
CH3NH2 +H2O
-
CH3O- + +NH4
-
CH3OH2+ + -NH2
Pregunta 24
Pregunta
Identify the compound with the highest pKa
Respuesta
-
HCCN
-
CH3NH2
-
CH2CH2
-
CH3CH3
-
CH3OH
Pregunta 25
Pregunta
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 ______.
Respuesta
-
ether; CH3(CH2)4CO2H
-
water; CH3(CH2)4CO2-
-
ether; CH3(CH2)4CO2-
-
water; CH3(CH2)4CO2H
-
none of the above
Pregunta 26
Pregunta
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 ______.
Respuesta
-
water; CH3(CH2)4CO2-
-
water; CH3(CH2)4CO2H
-
ether; CH3(CH2)4CO2-
-
ether; CH3(CH2)4CO2H
-
none of the above
Pregunta 27
Pregunta
The conjugate acid of H2O is
Respuesta
-
H3O+
-
HO-
-
H2O+
-
H3O-
-
H3O
Pregunta 28
Pregunta
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?
Respuesta
-
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-.
Pregunta 29
Pregunta
Which of the following ions is the strongest acid?
Respuesta
-
H30+
-
HSO4-
-
HO-
-
H-
-
H2)
Pregunta 30
Pregunta
What would be the conjugate base in the following acid base reaction
Respuesta
-
CH3S-
-
H2O
-
CH2O
-
CH3SH2+
-
CH3OH
Pregunta 31
Pregunta
What would be the conjugate acid in the following acid base reactions
Respuesta
-
CH3S-
-
CH2O
-
CH3OH
-
H2O
-
CH3SH2+
Pregunta 32
Pregunta
Which of the following species cannot function as a lewis Acid ?
Respuesta
-
H2O
-
TiCl4
-
AlCl3
-
NH4+
-
H+
Pregunta 33
Pregunta
What is the conjugate acid of NH3 ?
Respuesta
-
+NH4
-
-NH
-
-NH2
-
+NH2
-
+NH3
Pregunta 34
Pregunta
What is the conjugate acid of CH3NH2?
Respuesta
-
CH3NH-
-
CH3NH3+
-
NH4+
-
NH2-
Pregunta 35
Pregunta
What is the conjugate base of CH3NH2?
Respuesta
-
NH4+
-
CH3NH-
-
NH2-
-
CH3NH3+
Pregunta 36
Pregunta
Ar there any conditions under which a student may work alone ?
Respuesta
-
maybe
-
yes
-
no
-
students may work unrestricted at their convenience
Pregunta 37
Pregunta
In case of an emergency in the lab, who should be notified ?
Respuesta
-
instructor
-
anybody
-
SOuthern University Police
-
a friend
Pregunta 38
Pregunta
What precautions are needed with long hair and breads?
Respuesta
-
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
Pregunta 39
Pregunta
What should be the very last function performed in the laboratory before you leave?
Respuesta
-
make sure that your locker is secure
-
wash your hands
-
bid the instructor farewell
-
arrange a time with you laboratory partner for lunch
Pregunta 40
Pregunta
What should be worn in a laboratory at all times?
Respuesta
-
contact lenses
-
mask
-
a cap
-
safety glasses
Pregunta 41
Pregunta
When adding a solid metal to water, the metal will:
Respuesta
-
dissolve
-
displace its volume
-
lower the liquid volume
-
form a homogenous mixture
Pregunta 42
Pregunta
Why is smoking not permitted in the lab ?
Respuesta
-
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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