Homework Course Outline Case Study 9.1 Questions * Please hand-in to the hand-in box *

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Homework Course Outline Case Study 9.1 Questions * Please hand-in to the hand-in box *

Organic Chemistry – 9.2 Alkanes

Hydrocarbons which the carbon-carbon bonds are only single bonds Saturated hydrocarbons Table 3 on pg. 366 *memorize*

Drawing Alkanes Draw methane, ethane, propane…. Up to decane

Structural Isomers Same molecular formula but with different structure Have different physical and chemical properties Need to write isomers differently to indicate the shape

Example C 4 H 10 can be: – Butane – Methylpropane

Naming isomers The name of the compound indicates whether there are branches on a carbon chain Branch= any group of atoms that is no part of the main structure of the molecule A branch with only carbon and hydrogen is known as an alkyl branch In the names of alkyl branches, the prefixes are followed by a –yl suffix.

Naming Branched Alkane STEPS (pg. 368) 1.Identify the longest continuous chain of carbon atoms-the parent chain and number the carbon atoms from the end closest to the branches 2.Identify any branches and their location number on the parent chain 3.Write the complete IUPAC name following this format: (number of location)-(branch name)(parent chain) If the branch is right in the middle, the number is not necessary.

Example

2-methyl, 3-ethylbutane OR… 2,3 dimethlybutane

Drawing Branched Alkane Structure 1.Draw a straight chain containing the number of carbon atoms represented by the name of the parent chain and number the carbon atoms from left to right 2.Attach the branches to their numbered locations on the parent chain 3.Add enough hydrogen atoms to show that each carbon has four single bonds.

Drawing Isomers dimethylpropane (2,2-dimethylpropane) 2-methlypentane 2,3-dimethlyhexane 3-ethly-2,4-dimethylpentane 2,3,4-trimethylpentane tetramethylbutane

Cycloalkanes All carbon-carbon bonds in a single bonded cyclic hydrocarbon

Naming cycloalkanes Named by placing the prefix cyclo in front of the alkane name If branches are present, treat the cycloalkane as the parent chain and identify the branches

Spangler science nlQ

Pg. 370 #7-11 Pg. 373 #6-8 Memorize table #3 pg. 366