Ch. 3 & 4 atom & molecules               test                  40 points                                              chemistry

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

symbol

# protons

# neutrons

# electrons

charge

Atomic mass

45Ca2+

 

 

 

 

 

 

 

36

 

- 2

70

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

Chemical formula

Chemical name

Al2O3

 

 

Potassium carbonate

S3F6

 

 

Dinitrogen hexa-oxide

Pb(OH)2

 

3. Calculate the mean and standard deviation of the following data:  10, 15, 20.  Show your work and include any formula / equation.  [5 points]

4.  In regards to the following chemical formulas, identify the atoms, by their chemical name, and the number of that atom in one molecule.  [15 points]

a. Ba(C2H3O2)2:

b.  (NH4)2SO4: