anonymous
  • anonymous
draw structural formula for 2,2-dimethyloctane. then give a chemical formula for the molecule
Chemistry
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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JoannaBlackwelder
  • JoannaBlackwelder
Step 1: draw the base molecule.
JoannaBlackwelder
  • JoannaBlackwelder
Do you know what octane is?
JoannaBlackwelder
  • JoannaBlackwelder
(leave off any hydrogens for now)

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Ciarán95
  • Ciarán95
Let's look at what we have to draw here: 2,2-dimethyloctane The easiest thing to do first is to consider the type of organic functional group to which the compound belongs to. At the end of the molecule name is "-ane" meaning that it is an alkane. This is a type of saturated hydrocarbon with only C-C single bonds (no double or triple bonds). Now, we can move further along by considering the type of alkane which the molecule is based around. This can be identified from the "-oct-" or "-octane" segment of the molecule. Thus, or compound will contain eight carbon atoms in a open chain, each connected by a single bond. The structure of octane can be shown as: |dw:1432985994570:dw| Obviously all the C-C and the C-H bond lengths should be the same here! Now we can move on to dealing with the substituents that are bonded to this chain of carbon atoms. These will essentially replace the hydrogen atoms shown above and we can identify them from looking at the "2,2-dimethyl-" part of the molecule name. So, we can see from "dimethyl" that there will be two methyl (CH3) substituents bonded to the carbon chain at some point. Carbon is tetravalent, meaning that it will tend to form no more than four single bonds to atoms around itself. So, we must try to identify where these CH3 groups will 'replace' the hydrogens drawn above in the octane structure. To, do this, we can number our carbons across the chain from 1 to 8. For an alkane, it does not matter which side we start at (working left to right or right to left), but we must be consistent with whatever method of numbering we use. "2,2-dimethyl-" indicates that there will be two CH3 substituents, each bonded to the carbon labelled with the number 2 ("2,2-"). From this, you should be able to now draw the final molecule structure. As for the chemical formula, there are two ways of writing this. One method is to simply count up all the carbon atoms (x) and hydrogen atoms (y) in your final structure and write the formula in the form: \[C _{x}H _{y}\] However, the more common and perhaps better way of writing it is to count up all the carbons in the main chain (x), all the hydrogen atoms bonded directly to this main chain (y) and then the number of CH3 substituents bonded to this main chain (z). This would give us a slightly more intuitive formula from which it would be easier to understand the structure of the molucule: \[C _{x}H _{y}(CH _{3})_{z}\]

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