Chem 210 - Exam #1 Sample

Sample Exams are designed to give you an idea of the types of questions you can expect.  Exam numbers may not exactly agree with currently assigned material, so you may need to examine other sample exams to see questions that might be similar to the upcoming exam.  Be aware, that this sample exam does NOT cover some of the material that will be on the upcoming exam.  Use these sample exams to see the types of problems that will be on your exam.  Study your homework and in text questions primarily. Answers for Sample Exam #1 are now available.

1. Give the definition of an acid and a base using either the Lowry-Bronsted and Lewis definitions.  Give one example for each.

2. Draw three (3) structural isomers for a  saturated molecule containing the empirical formula: C₃H₈O.

3. Starting with Cl₂ and CH₄, show how you would produce CH₃Cl. Be sure to include all reaction conditions, including those necessary to initiate the reaction. This type of reaction is a substitution reaction using a ___________________ intermediate. Why is this reaction sequence considered to be a chain reaction?

4. Draw the four (4) reaction products you would get in #3 above. Name each.

5. What is an inhibitor? For the halogenation reactions, show why O₂ is an inhibitor. What is the formula for the inhibition product which stops this chain reaction.

6. Draw the nine (9) structural isomers of heptane (C₇H₁₆). Include only the C-C bonds, you don't need to show every H.

7. Give names for alkanes having the number of carbons shown. Also, give the generic (empirical) formula for each showing the number of C's and H's.

2 ______________________________ __________________

4 ______________________________ __________________

9 ______________________________ __________________

10 ______________________________ __________________

12 ______________________________ __________________

20 ______________________________ __________________

8. Define and give an example of:

ionic bond

covalent bond

dipole

van der Waals interaction

free radical

9. Show a reaction to convert an alkene into an alkane. Include reactants, catalysts, conditions, etc. required. Then give an example, for a 4-carbon alkene, including names.

10. For the following compound, please indicate each carbon as being either 1^o, 2^o, 3^o, or 4^o.

11. Show the structural formula for:

1-iodo-2-methylpropane

3,3-Diethyl-5-isopropyl-4-methyloctane

3,4,4,5-tetramethylheptane

5-t-butyl-4,6-diethyl-5-isopropyl-2,2,8-trimethylnonane

12. For each of the following, give the correct IUPAC name, redrawing the structure, if necessary to present the longest carbon change in straight horizontal.

C-C-C-C-C-C-C-C-C-C
    |         |
    C-C-C-C   C-C

(CH₃)₂CHCH₂CH₂CH₃

(CH₃)₂CHC(C₂H₅)CH₂CH₂CH₃

(CH₃)₃CCH₂C(CH₃)₃

13. You have a priceless radioactive alkane that you accidentally converted into a mono-bromo derivative. You want to convert it back into an alkane. Show how you could do this using the Grignard reaction. Use *R- as your priceless alkane, since you don't need to show the complete structure. Be sure to include all reactants, requirement for anhydrous reagents, structures for intermediate components. Start with *R-Br and end with *R-H.

EXTRA CREDIT (5 points; solve either A or B, but not both):

(A) Show the Newman projections for n-butane in the Anti, Gauche (2 are possible), and eclipsed positions.

(B) Show the Potential energy plot as you go from Anti to Gauche to Gauche positions for n-butane. Remember, there will be two (2) different eclipsed positions to plot as energy maximums.