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S20 Unit A: Chemistry Organic ChemAssignment
Name: ____________
Date: ____________
1. Complete the following table. (0.5 marks for each space)
IUPAC name
molecular
formula
condensed structural formula
propane
CH3CH2CH3
1-butene
CH2CHCH2CH3
2,4-dimethylpentane
C7H16
CH3CCCH2CH2CH3
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line diagram
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2. Define the following terms: (0.5 marks each)
a) Aliphatic hydrocarbon:
b) Alkyne:
c) Alkane:
d) Alkene:
3. Explain the difference between a saturated and unsaturated hydrocarbon. Draw an example of
a structural diagram of each type of hydrocarbon. (4 marks)
Saturated:
structure
Unsaturated:
structure
4. An unknown straight-chain hydrocarbon contains 27 carbon atoms. Determine how many
hydrogen atoms would be present if the hydrocarbon is a: (3 marks)
a) alkane
b) alkene
c) alkyne
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Hint: Remember
Alkane - CnHn+2
Alkene - CnHn
Alkyne - CnHn-2
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5. The following compounds are named incorrectly. Draw a complete structural diagram of the
compound, then name it correctly. (2 marks each)
a) 2-ethyl-pentane
Correct name: _______________________
b) 4-butyl-2-methyl-hexane
Correct name: _______________________
c) 3-ethyl-2-propyl-5-hexyne
Correct name: _______________________
6. In the combustion of octane in a car engine, 6.5 moles of octane are used up.
a) Determine the balanced chemical formula for the combustion of octane. (1 mark)
b) Determine the number of moles of carbon dioxide produced in this reaction. (1 mark)
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3/4/2009
7. In order to produce plastics, the organic molecule ethene is needed. This compound is created
by refining crude petroleum from a fractional distillation tower in a cracking container. In this
container, long chain hydrocarbons such as octane are cracked to form ethene and other
compounds according to the balanced chemical formula below:
C8H18(l)  2 C2H4(g) + _________
octane

ethene
+ unknown hydrocarbon
+ CH4(g)
+ methane
Determine the identity of the unknown hydrocarbon. Give both it’s IUPAC name and condensed
structural formula. (2 marks)
Name: ___________________________
structure
8. Draw a diagram of a fractional distillation column. Include in your diagram labels showing the
size of each hydrocarbon produced and the common use for each hydrocarbon. (Hint: use your
worksheet from the computer lab or your textbook). (4 marks)
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3/4/2009
9. Write the balanced chemical equation for the following reactions: (2 marks each)
a) The combustion of 5,5-diethyl-2,2-dimethyl-octane
b) The hydrogenation of 2-butene
c) The hydrogenation of 2-methyl-3-hexyne
d) The cracking of hexane into two three-carbon molecules
10. Starting with propene (shown below), show the polymerization of polypropene. (2 marks)
Bonus Questions: Answer only ONE!!!
Fair Bonus Question: Name the organic molecule shown in the title of this assignment.
Unfair Bonus Question: Science fiction tells us that some space-creatures may not be carbon-based life-forms, like we are. What element are
these alien’s based on?
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