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Isomers and polymers Structural Isomers 1.Pentane and 2-methylbutane are both C 5 H 12. 2. 3.C 4 H 10 has 2 isomers (2-methylpropane, butane). C 4 H.

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Presentation on theme: "Isomers and polymers Structural Isomers 1.Pentane and 2-methylbutane are both C 5 H 12. 2. 3.C 4 H 10 has 2 isomers (2-methylpropane, butane). C 4 H."— Presentation transcript:

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2 Isomers and polymers

3 Structural Isomers 1.Pentane and 2-methylbutane are both C 5 H 12. 2. 3.C 4 H 10 has 2 isomers (2-methylpropane, butane). C 4 H 8 has more isomers because the position of the double affects the name and because ring structures can be drawn. 1-butene 2-butene 2-methylpropene cyclobutane methylcyclopropane

4 Geometric Isomers 4.cis = same side, trans = opposite sides 5.1,2-dichloroethene requires cis or trans. 1,2-dichloroethane does not require cis or trans because they would both represent the same molecule (to move chlorine from the same side to opposite sides only requires that the C – C single bond be rotated). 6. trans-1,2-dimethylcyclopentane cis-1,2-dimethylcyclopentane

5 7.1,1-dimethylcyclopentane 8.A molecule is relatively inflexible when a multiple (double or triple) bond is present or if a ring structure (including benzene) exists. 9.a) not isomers (they dont have the same chemical formula: C 5 H 12 vs. C 5 H 10 ) b) structural isomers (same as question #1) c) geometric isomers d) not isomers (both diagrams represent the exact same molecule)

6 11.Monomer: the smallest repeating unit of a polymer (propene in polypropylene). Polymer: a long chain molecule made up of many small identical units (monomers). Addition polymerization: a reaction in which unsaturated monomers combine with each other to form a polymer. 12.Teflon, polypropylene, polyester, polyethylene (pop bottles, grocery bags), polystyrene (packing material), Plexiglas, polyvinyl chloride (vinyl), natural rubber, etc. Polymers

7 Geometric Isomers cis-1,2-dichlorocyclopentane trans-1,2-dichlorocyclopentane cis-1,2-dichloroethene trans-1,2-dichloroethene For more lessons, visit www.chalkbored.com www.chalkbored.com


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