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Chem Lab Review

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Chemistry Quiz on Chem Lab Review, created by Princess Stark on 27/11/2018.
Princess Stark
Quiz by Princess Stark, updated more than 1 year ago
Princess Stark
Created by Princess Stark almost 6 years ago
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Resource summary

Question 1

Question
Give the number of nonbonding lone pairs electrons in H2NOH
Answer
  • 0
  • 1
  • 2
  • 3
  • 4

Question 2

Question
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 ?
Answer
  • slightly positive
  • -1
  • +1
  • unchanged
  • slightly negative

Question 3

Question
Which of the compounds below have bonds that are predominantly ionic?
Answer
  • NH3
  • KCl
  • CF4
  • both a and B
  • both b and c

Question 4

Question
What type of bonding is most important in CH3CH2CH2CH2CH2CH3?
Answer
  • covalent
  • ionic
  • hydrogen
  • polar

Question 5

Question
Which of the following contains polar covalent bonds ?
Answer
  • NH2
  • Na2O
  • KF
  • H2
  • both a and c

Question 6

Question
Which of the following covalent bonds has the largest dipole moment ?
Answer
  • H-N
  • C-O
  • H-F
  • C-C
  • C-H

Question 7

Question
Which of the following elements does this electronic configuration represent 1s2 2s2 2p5?
Answer
  • C
  • Al
  • N
  • F
  • O

Question 8

Question
The formal charge on the nitrogen in the compound below is
Image:
Screen Shot 2018 11 26 At 10.49.33 Pm (binary/octet-stream)
Answer
  • +2
  • +1
  • -2
  • 0
  • -1

Question 9

Question
which of the following is the most likely electronic structure for C2H2 ?
Answer

Question 10

Question
Which of the following structures, including formal charges, is correct for diazomethane, CH2N2?
Answer

Question 11

Question
What are the formal charge on nitrogen and the starred oxygen atom in the following molecule ?
Image:
Screen Shot 2018 11 26 At 11.00.33 Pm (binary/octet-stream)
Answer
  • N=+1 , O=0
  • N=-1, O=0
  • N=-1, O=-1
  • N=+1, O=-1
  • N=+1 , O=+1

Question 12

Question
How many unpaired electrons are present in the isolated carbon atom (atomic number =6) ?
Answer
  • none
  • one
  • two
  • three
  • four

Question 13

Question
Give the formal charge on nitrogen in NH4.
Answer
  • -2
  • -1
  • 0
  • +1
  • +2

Question 14

Question
Which of the following is the electronic configuration of the element Fe?
Answer
  • 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

Question 15

Question
The atomic number of boron is 5. The correct electronic configuration of boron is
Answer
  • 2s2 2p3
  • 1s2 2s3
  • 1s2 2p3
  • 1s2 2s2 2p1
  • 1s2 2s2 3s1

Question 16

Question
Give the electronic configuration of N-3
Answer
  • 1s2 2s2 2p6
  • 1s2 2s2 2p3
  • 1s2 2s2
  • 1s2 2s2 2p6 3s1
  • 1s2 2s2 2p4

Question 17

Question
Convert the model below into skeletal structure
Image:
Screen Shot 2018 11 26 At 11.18.27 Pm (binary/octet-stream)
Answer
  • 1
  • II
  • III
  • IV
  • V

Question 18

Question
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?
Image:
Screen Shot 2018 11 26 At 11.23.59 Pm (binary/octet-stream)
Answer
  • 0
  • 1
  • 2
  • 3
  • 4

Question 19

Question
Which of the following is not a conjugate acid-base pair?
Answer
  • H2SO4-, H2SO4
  • H2O, HO-
  • -OH, O2-
  • H2O, H3O+
  • NO3-, NO2-

Question 20

Question
Which of the following is the strongest acid ?
Answer
  • CH3NH3+
  • CH3NH2
  • CH3OH
  • CH3OH2+
  • H2N-

Question 21

Question
The pKa of CH3COOH is a 4.8 and the pKa of HCOOH is 3.8. Given the information, one knows that
Answer
  • 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-

Question 22

Question
Identify the compound with the highest pKa
Answer
  • CH3NH2
  • CH3NH3+
  • CH3OH
  • CH3COOH
  • H2O

Question 23

Question
what is the product formed from the following acid-base reaction when ammonia functions as a base? The equilibrium lies far to the reactants
Image:
Screen Shot 2018 11 26 At 11.49.33 Pm (binary/octet-stream)
Answer
  • CH2OH + +NH3
  • CH4 +NH2OH
  • CH3NH2 +H2O
  • CH3O- + +NH4
  • CH3OH2+ + -NH2

Question 24

Question
Identify the compound with the highest pKa
Answer
  • HCCN
  • CH3NH2
  • CH2CH2
  • CH3CH3
  • CH3OH

Question 25

Question
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 ______.
Answer
  • ether; CH3(CH2)4CO2H
  • water; CH3(CH2)4CO2-
  • ether; CH3(CH2)4CO2-
  • water; CH3(CH2)4CO2H
  • none of the above

Question 26

Question
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 ______.
Answer
  • water; CH3(CH2)4CO2-
  • water; CH3(CH2)4CO2H
  • ether; CH3(CH2)4CO2-
  • ether; CH3(CH2)4CO2H
  • none of the above

Question 27

Question
The conjugate acid of H2O is
Answer
  • H3O+
  • HO-
  • H2O+
  • H3O-
  • H3O

Question 28

Question
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?
Answer
  • 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-.

Question 29

Question
Which of the following ions is the strongest acid?
Answer
  • H30+
  • HSO4-
  • HO-
  • H-
  • H2)

Question 30

Question
What would be the conjugate base in the following acid base reaction
Image:
Screen Shot 2018 11 27 At 12.15.14 Am (binary/octet-stream)
Answer
  • CH3S-
  • H2O
  • CH2O
  • CH3SH2+
  • CH3OH

Question 31

Question
What would be the conjugate acid in the following acid base reactions
Image:
Screen Shot 2018 11 27 At 12.15.14 Am (binary/octet-stream)
Answer
  • CH3S-
  • CH2O
  • CH3OH
  • H2O
  • CH3SH2+

Question 32

Question
Which of the following species cannot function as a lewis Acid ?
Answer
  • H2O
  • TiCl4
  • AlCl3
  • NH4+
  • H+

Question 33

Question
What is the conjugate acid of NH3 ?
Answer
  • +NH4
  • -NH
  • -NH2
  • +NH2
  • +NH3

Question 34

Question
What is the conjugate acid of CH3NH2?
Answer
  • CH3NH-
  • CH3NH3+
  • NH4+
  • NH2-

Question 35

Question
What is the conjugate base of CH3NH2?
Answer
  • NH4+
  • CH3NH-
  • NH2-
  • CH3NH3+

Question 36

Question
Ar there any conditions under which a student may work alone ?
Answer
  • maybe
  • yes
  • no
  • students may work unrestricted at their convenience

Question 37

Question
In case of an emergency in the lab, who should be notified ?
Answer
  • instructor
  • anybody
  • SOuthern University Police
  • a friend

Question 38

Question
What precautions are needed with long hair and breads?
Answer
  • 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

Question 39

Question
What should be the very last function performed in the laboratory before you leave?
Answer
  • make sure that your locker is secure
  • wash your hands
  • bid the instructor farewell
  • arrange a time with you laboratory partner for lunch

Question 40

Question
What should be worn in a laboratory at all times?
Answer
  • contact lenses
  • mask
  • a cap
  • safety glasses

Question 41

Question
When adding a solid metal to water, the metal will:
Answer
  • dissolve
  • displace its volume
  • lower the liquid volume
  • form a homogenous mixture

Question 42

Question
Why is smoking not permitted in the lab ?
Answer
  • 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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