HW: Making Scent (p. 120)

Handwrite in your notebook the conclusion to the lab report. The directions are below. This will be your rough draft grade to the lab report.

HW DUE: Thursday (A/5th) and Friday (B), Nov. 8-9, 2012

Final Lab Report Instructions: Create a Smell

Use notebook pages 116-120 for reference

Final DUE: Tuesday (A/5th) and Wednesday (B), Nov. 13-14, 2012.

Please note: This is an independent report. You may not work on this report with any other chemistry student (even though you did this with your team). If more than one student turns in the same report, all students will receive zeros for this assignment. It is an independent assignment. If you need help, come and see me during office hours in the morning or lunch. Also, late reports will receive partial credit.

These are the items (in order) you must include in your typed lab report (there are computers in the library you can use if you are having computer problems at home and you may email the lab report to if you having printer problems.)

Title of the Experiment (you do not need a title page)

Purpose of the lab: 1 sentence and must be in your own words

Materials and Procedure: Please copy and paste the procedures below.

Materials:

50-mL beaker boiling stones hot plate

2 microscale test tubes plastic pipettes organic acids and alcohols (see below)

Procedure:

1. Fill a 50-mL beaker with 30 mL of water.

2. Drop in a boiling stone.

3. Place the beaker of water on a hot plate and bring the water to a gentle boil.

4. Label your test tubes 2 and 3.

5. Add 5 drops of the appropriate carboxylic acid to each tube. Check the table below to see which acid should go in which tube. Make sure that you carefully smell the acids by wafting and record the smells in the data table in your notebook.

6. Add 10 drops of the appropriate alcohol to each tube. Check the table below to see which alcohol should go in which tube. Make sure that you carefully smell the alcohols by wafting and record the smells in the data table in your notebook.

Test Tube Organic Acid Alcohol

2 Acetic acid Butyl alcohol

3 Butyric acid Ethyl alcohol

7. Add 1 drop of the concentrated sulfuric acid, H2SO4, to each tube.

8. Drop a boiling stone into the mixture in each tube.

9. Carefully smell each mixture by wafting and record the smells in the data table in your notebook.

10. Cut a plastic pipette so that it is shorter than the length of the test tube. Put it in the test tube with the stem down, such that the bulb makes a loose seal.

11. Place the tubes into the boiling water and heat for 5 minutes.

12. After 5 minutes, remove the tubes from the water.

13. Remove the pipette from the test tube.

14. Carefully squeeze the pipette near your nose so that you can waft and smells the vapors. Record the smell in the data table in your notebook.

Data: In this section, you will type your data into a table identical to your data table pg. 116 in your notebook.

Results:

-1. What evidence do you have that a chemical reaction took place?

-2. Draw out the two chemical reactions you did in the lab using structural formulas (this will need to be done by hand or typed). See your notebook pages 119. Clearly label the name of each chemical under its structural formula in the equation.

-3. In general, what smell do carboxylic acids have? Label each chemical in your equations above with their smell classifications.

-4. In general, what smell do alcohols have? Label each chemical in your equations above with their smell classifications.

-5. In general, what smell do esters have? Label each chemical in your equations above with their smell classifications.

-6. What are the reactants in each chemical reaction? What are the products?

-7. Why is sulfuric acid, H2SO4 shown above the arrow?

-8. What did the catalyst do?

-9. What bonds are broken in this type of a reaction? Where is the location of broken bond?

-10. Where did the energy come from to break these bonds?

-11. What type of bond is formed in these reactions?

Conclusion (4 to 5 sentences)

-Explain how a chemical reaction took place. Then explain how it is possible to turn a putrid smelling substance into a sweet smelling substance.