See Syllabus for Date

Mid-Term Exam See Syllabus for date

The Mid-Term Exam covers the experiments covered in labs 1-6. You will turn in Lab 7 on the week following your Mid-Term Exam. You should be able to write equations for all of the experimental reactions and calculate theoretical and percent yields for them. Given a chemical reaction, you should be able to write an equation for the reaction, balance the equation, and make calculations involving the stoichiometry of the reaction. You should be able to answer any of the questions that were part of your lab reports. Likewise, you should be able to answer questions that are very similar to the homework questions. You should be able to answer questions about the experiments. On the next page is a sample of a Mid-Term Exam. The points would be doubled to make 100 points.

Topic for Lab 11-Oral or Written Presentation is due for 5 points credit.

Study Outline For the Mid-Term Exam

1. Questions typical of those on the Lab 1 Evaluation. a. How many hybrid orbitals does the C3 carbon of 1-propyne have? b. What is the functional group in CH3CO2H?

2. Questions about the major reactions studied. a. Write an equation for the Diels-Alder reaction you performed in lab. b. What reagent did you use to acetylate salicylic acid?

3. Questions on calculating theoretical yield and percent yield. a. Given the quantities of starting materials, calculate the theoretical yield. (Note: you must find molecular weights, covert them to moles, use the mol-to-mol relationship between limiting reagent and product to determine moles of product and covert moles of product into grams (the theoretical yield). b. Given an actual yield, calculate a percent yield using your theoretical yield calculated above. 4. Any questions you had as part of your 10 weekly questions. 5. Show the mechanism of any lab reaction (part of your weekly reports).

Lab 8 1 Prince George's Community College Mid-term Exam CHM 204 Night Fall 2002 50 Points Organic Chemistry II Lab Name ______K__e_y______

1. (6 pts) Name the three functional groups (organic families) in the following compound. b O CHO O c (acid) amide ether and aldehyde CH3CNa a b c Complete the equations in questions 2-5 by drawing in the structure of the major organic product. O 2. (6 pts) NaBH CH 4 CH OH Ethanol 2

O O O HNO3 (conc) 3. (6 pts) Heat HO OH O O O O O CH H2NNHCNH2 CH NNHCNH2 4. (6 pts)

O O O 5. (6 pts) ( 1 ) N a O H P h C=CHCCH=CPh CH3CCH3 + 2 C (2) Heat 2 2

6. (6 pts) Write an equation for the Diels-Alder reaction between 1,3-cyclohexadiene and ethene. +

7. (6 pts) Write an equation for the hydrolysis of acetic anhydride. O O O

CH3COCCH3 + H2O CH3COH 8. a. (6 pts) Given the following equation and data, what is the theoretical yield in grams of Compound C when g of Compound A is allowed to react with g of Compound B? O O

CH3COH + CH3CH2OH CH3COCH2CH3 + H2O A B C D Mol Wt (g/mol) 60 46 88 18 Formula C2H4O2 C2H6O C4H8O2

If A is LR: 30 g A x 1 mol A x 1 mol C x 88 g C = 44 g C The LR A gives the 60 g A 1 mol A 1 mol C smaller amount, which is the theoretical yield. If B is LR: 24 g B x 1 mol B x 1 mol C x 88 g C = 46 g C 46 g B 1 mol B 1 mol C

8. b. (2 pts) What is the limiting reagent (LR) in the reaction? Circle one: A B C D

Lab 8 2