Chm 501
Practice Lab Quiz: Carbon

Instructions:  Circle the best answer for each question.

The Reagent Shelf.
These compounds are available as pure substances or in solution, as appropriate for your needs.
 
Acids  Bases  Boron  Carbon Halogens Hydrogen
H2SO4
H3PO4
HCl
HNO3
 

 

 Ca(OH)2
KOH
NaOH
 

 

 B(OH)3
B2O3
BF3
Na2B4O7.10 H2O
NaBH4
NaBO3.4 H2O 		 C(s) 
CaC2
CO 
CO2
Na2CO3
Na2CO3
NaHCO3		 Br2
Cl2
I2
KBr 
KI 
NaCl 		 CaH2
H2
LiAlH4
NaBH4
 

 

 
Metals, Metal Salts  Oxygen  Nitrogen  Phosphorus Silicon Sulfur
Cu
Cu(NO3)2
Mg
MgO
MnO2
Zn
Zn(NO3)2		 H2O
H2O2
Na2O
O2
O3
 

 

 KNO3
NaNO2
NH3(aq)
NH3(g)
 

 

 Ca3P2
H3PO3
H3PO4
P(red)
P4
P4O10

 

 Si
SiCl4
 
 
 
 
 

 

 H2S
FeS
Na2S
Na2SO3
NaHSO3
S8
SO2
SO3

Carbon

1. Which one of the following statements about 14C is FALSE?

A. Trace levels of 14C are found in all living matter.
B. The half-life of 14C  is approximately 5730 years.
C. 14C is produced by the bombardment of 14N with thermal neutrons in the upper atmosphere.
D. 14C has two neutrons more than the most stable isotope of carbon.
E. The ratio of 14C:12C in a 250 million year old sample of dolomite would be greater than in a sample of bone thought to be 500 years old.
2. Rank the allotropes of carbon in order of decreasing density.
A. diamond > graphite > buckminsterfullerane
B. diamond > buckminsterfullerane > graphite
C. graphite > buckminsterfullerane > diamond
D. graphite > diamond > buckminsterfullerane
E. buckminsterfullerane > diamond > graphite
F. buckminsterfullerane > graphite> diamond
3. Recall the differences between inorganic and organic carbon in order to select the one compound from these choices that would be considered 'organic'
A. calcium carbide    D. formaldehyde (methanal)
B. sodium bicarbonate   E. carbon tetrachloride
C. carbon monoxide    F. oxalic acid
4. What is the difference between the carbides 'methanide'  and 'acetylide'?
A. Methanide is C-4 and acetylide is C2-4.  B. Methanide is C-4 and acetylide is C2-2.
C. Methanide is C2-4 and acetylide is C-4.  D. Methanide is C2-4 and acetylide is C2-2.
E. Methanide is C-2 and acetylide is C2-2.  F. Methanide is C-2 and acetylide is C2-4.
5. How many s- and p-bonds are present in buckminsterfullerane :
A. 90 s-bonds and 30 p-bonds
B. 90 s-bonds and 60 p-bonds
C. 90 s-bonds and no p-bonds
D. 180 s-bonds and 60 p-bonds
E. 180 s-bonds and no p-bonds
6. Which of the following is NOT likely to be found in the combustion zone of a methane flame?
A. CH3O  B. OH   C. H  D. CH  E. CHO
7. Which one of the following important carbon-containing anions is correctly named?
A. C2O4-2, dicarbonate  B. HCO3-, carbonite  C. CN-, cyanide
D. C2H3O-2, methanoate  E. C2-2, carbate
8. The species C2-2, CN-, and CO all have the same Lewis dot structure.  What else do they have in common?
A.  The bond order is 2.0 for all three.
B.  All three are paramagnetic.
C.  They all have sp2 hybridization
D.  The formal charge on carbon is -1 in all three.
E.  They have more than one of the above in common.
F.  They have none of the above in common.
9. From what you observed of the physical properties of liquid carbon dioxide, which statement is FALSE?  Liquid carbon dioxide . . .
A.  is colorless.
B.  exists at room temperature at high pressure.
C.  has a very high surface tension.
D.  does not exist under standard conditions.
E.  can be prepared from dry ice.
10. What is one of the products of the reaction between NaOH(aq) and CO2(g)?
A.  sodium carbide     D.  sodium formic (sodium methanoate)
B.  carbon monoxide     E.  sodium carbonate
C.  hydrogen peroxide
11. The anion cyanamide, CN2-2 is connected as: [N-C-N]-2.  Sketch its Lewis dot structure(s) and assign formal charges to select the best structure.  Which of these statements is true regarding the best structure?
A.  The structure utilizes two double bonds.
B.  The formal charge on carbon is +1.
C.  The structure is bent.
D.  The formal charges on the nitrogens can never be the same.
E.  The hybridization on carbon is sp3.
12 and 13. Reagent shelf.  What are the two chemicals that you heated together in order to produce samples of CH4(g)?

14 and 15. Reagent shelf.  What are the two chemicals that you used in order to produce samples of C2H2(g)?

 

Answers:
 
1.  E
2.  A
3.  D
4.  B
5.  A
6.  D
7.  C
8.  D
9.  C
10. E
11. A
12/13.  NaC2H3O2 + NaOH
14/15 CaC2/H2O