1. Aim: How can we name and draw hydrocarbons?
Do Now:
Take out a calculator and reference tables.
Write the chemical formula and draw an example of one molecule of the following:
Methane, ethane, propane, butane, pentane, hexane, heptane, octane, nonane, decane.
3. What makes this a homologous series?

2. Answer to Do Now Methane Ethane Propane Butane Pentane Hexane Heptane
Octane
Nonane
Decane

3. Alkenes Contain at least one double bond.
We can use tables P and Q to name and draw alkenes as well. The general formula for alkenes is:
Example: What is the molecular formula for ethene?
Draw a molecule of ethene.

4. How can we tell where the double bond is when there are more than two carbon atoms?
Example: Draw a molecule of butene.
How many ways can butene be drawn?
Molecules that have the same molecular compositions but different structural formulas are called isomers.
We can determine where the double bond is by numbering the carbon atoms. The carbons are numbered so that the double bond is at the lowest number. Example: 2-hexene

5. More Examples
Write the formula for each of the following alkenes. Draw a molecule of each of the following.
propene
3-Pentene
5-Heptene

6. Alkynes Contain at least one triple bond.
Also use tables P and Q to name and draw. The molecular formula for alkynes is:
Example: What is the chemical formula for ethyne?
Draw a molecule of ethyne.

7. More Examples
Write the formula for the following alkynes. Draw an example of a molecule for each of the following alkynes.
3-pentyne
5-octyne

8. Activity/Homework
Review Book pages Copy and answer questions 1-4, 8-12,