Physical Properties of Homologous Series
Physical Properties of Homologous Series
In this lab you will look at how the physical properties of organic compounds depend on the functional group, molecular size, and resulting intermolecular forces. The steps below will take you through the required procedures. The overall method for this lab, though, is to choose a homologous series and make a chart that gives the structure and name of the first five member of your homologous series. Choose a physical property to investigate. Find data for each member of your homologous series. Graph and analyze trend. (This will count as a lab grade)
A homologous series is a set of organic compounds with the same functional group that vary only by a CH2 group.
1. Choose a functional group (aldehyde, carboxylic acid, ketone, amine, or alcohol). Each member of your lab group needs to choose a different functional group.
2. (2) Consider the functional group, what kind of intermolecular forces will most affect it?
3. (1) What kind of intermolecular forces increase with the size of the molecule?
4. Choose a physical property that will be relatively easy to find data for (melting point, boiling point, density, heat of fusion, heat of vaporization, etc.) All group members need to choose the same property.
5. (5) Draw the first five members of the homologous series you have chosen, starting with the molecule that has only one carbon atom and working your way up to the molecule that has 5 carbon atoms.
6. (5) Name each molecule using the rules below
7. (4)Look up the physical property value for each of your five compounds and put in a data table.
8. (3)Graph the data
9. (4 pts) Write an analysis that explains the relative values of the physical property (are the boiling points high or low and explains the trend.
10. (6 pts) Explain any similarities and differences between your functional group and the functional groups of at least two other people. Look not only at the trend, but the actual values. Are they lower or higher than your functional group’s? Why?
11. Turn in this sheet, the data table, the graph, and the analysis.
Prefixes for organic compounds
- Methan = 1 carbon
- Ethan = 2 carbons
- Propan = 3 carbons
- Butan = 4 carbons
- Pentan = 5 carbons
- Hexan = 6 carbons
- Heptan = 7 carbons
- Octan = 8 carbons
- Nonan = 9 carbons
- Decan = 10 carbons
Suffixes for functional groups
Alkane – ane
Aldehyde – al
Alcohol – ol
Carboxylic acid – oic acid
Ketone – one
Amine (NH2) -- amine
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