Ch. 1 & 2  chemical formula & measurement (in forensic chem textbook)  test    [50 points]                   Chem

For problems involving calculations, show your work in an organized manner, include any relevant equation (or formula and conversion factor(s)), put the proper units in your calculations / answer, and 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.  Identify by name (not symbol) the atoms and the number of each atom in the following compounds.  [18 points]

a.  CH3 (CH2 )4 CH2 OH:  _______________________________________

 

b.  Pb(NO3 )2 :  _______________________________________________

 

c.  (NH4 )2 S:  __________________________________________________

 

2.  Write the following numbers in scientific notation without changing the number of significant figures in the number.  [8 points]

a.  0.001030  =   _________________

b.  3501 =  _____________________

c.  371.27 =  ____________________

d.  0.00018 =  ___________________

 

3.  solve   [8 points]

a.  2.0  +  3.00  =  __________

b.  0.125  -  0.05  =  _________

c.  6  *  3.0  =  _____________

d.  3.00  ÷  4.000  =  _________


4.  solve  [6 points]

a.  25 mm2   =  __ cm2

b.  35 g / second  =  __  kg / minute

5.  A 45.0 gram cylinder with a density of 3.0 g / mL and a height of 1.5 meters has a radius of __ mm.  [10 points]

 

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Ch. 3, 4, & 5 atoms, molecules, & measurement  (in district adopted textbook"retest"           [50 points]                   Chem

For problems involving calculations, show your work in an organized manner, include any relevant equation (or formula and conversion factor(s)), put the proper units in your calculations / answer, and have the proper number of significant figures in your answer.  10 points per question._

1.  A 15.0 g object with a density of 2.6 g / mL was added to a graduated cylinder containing 7.5 mL water.  What is the volume of the graduated cylinder after completely immersing the object in the graduated cylinder ?

2.  fill-in the below table.

Chemical name

Chemical formula

 

N2 O6

 

K2 CO3

 

Pb(OH)4

Trisulfur octachloride

 

Iron (III) nitrate

 

 

3.  fill-in the below table.


symbol

# protons

# neutrons

# electrons

charge

Atomic mass

 

80

 

 

+ 2

198

32 P-3

 

 

 

 

 

4.  solve

a.  25 μm / second  =  __ cm / minute

b.  125 inch3   =  __  mL

 

5.  solve

a.  3.0  +  4.00  =  _________

b.  3.0 * 6.00  =  __________

c.  3.0  ÷  7.00  =  _________

d.   

e.  0.0125  -  0.009  =   ______