Ch. 1, 2, & 25  test                                          65 points

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.

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:  ___________________

1. A 25 mm long cylinder has a mass of 15.0 g and density of 7.55 g / mL.  What is the radius (in cm) ?  [10 points]

2.  Solve for k (in terms of mol, liter, and seconds), where   .    [10 points]

3. Fill-in the below table.  [15 points]

symbol

# protons

# neutrons

# electrons

charge

Atomic mass (amu)

90Sr2+

 

 

 

 

 

 

 

44

 

- 3

77

 

 

54

83

+ 3

 

 

4. Fill-in the below table.  [10 points]

Chemical formula

Chemical name

NaHCO3

 

Hg2Cl2

 

 

Aluminum sulfide

 

Triphosphorus hepta-oxide

S2F6

 

5. Biochemistry  [10 points]

a. Alanine is an amino acid with a methyl group as its side chain; sketch the structural formula of alanine. 

b. Briefly, describe the ___  structure of a protein  (4 points)

i. primary

ii. Secondary

iii. Tertiary

iv. Quandary

7. Sketch 5 isomers of an alcohol with a butyl group.  [10 points]