ch. 1, 2, 22, & MS  chem foundation; atoms, molecules, ions; organic- / bio- chem             60 points                               AP chemistry

Academic Honesty:   The answers on this test are my own and I am using only the allowed set of notes as described in the syllabus.  I have not discussed the test questions with anyone before or during the test nor have I seen the test questions prior to the exam.  If you violate any of the preceding items or do not sign, your semester grade is a F.

                                                                                                Signature:  ___________________

In problems involving any calculation, show your work in an organized manner, include (i) any relevant equation (or formula), (ii) conversion factor(s), (iii) put the proper units in your calculations and answer, and (iv) have the proper number of significant figures in your answer.

1. In regards to mass spectroscopy,  [10 points; hint:  it’s your weekly quiz problem]

2. Briefly describe how the mass spectrometer works.  [4 points]

3. Determine the average atomic mass of zinc based on the below information.  [6 points]

ms     ms_data table

4. Sketch the structural formula of __  with a methyl group(s).  [8 points]

a. Carboxylic acid

b. Amine

c. Ether

d. Aldehyde

5. Sketch a dipeptide  [10 points]

a. point out the peptide bond [4 points]

b. label the side chains in the amino acids as R1 and R2, which corresponds to the amino- and carboxyl- ends, respectively.  [6 points]

6. Fill-in the below table; [21 points; it’s your weekly quiz problem]

a. chemical name / chemical formula  [8 points]

 

Chemical name

Chemical formula

Barium phosphate

 

 

Sn(OH)4

Ammonium sulfide

 

 

P3F6

b. atom / ion composition [13 points]

 

symbol

# protons

# neutrons

# electrons

charge

Atomic mass

57Fe+2

 

 

 

 

 

 

98

 

 

0

198

 

 

15

18

- 2

 

7. Fill-in the blank.  [10 points; it’s your weekly quiz]

a. 275 cm  =  ___ m

b. rate 

c. 275 °C =  ___ K

d. 785 K  =  ____  °C

8.  Write the number, 0.0003010, in scientific notation:  __________________   [1 points]