ch. 3 & 4.  Atom and chemical formula / chemical name          test                          `40 points                              chemistry

In problems involving any calculation, show your work in an organized manner, include (i) any relevant equation (or formula), and (ii) put the proper units in your calculations and answer.

1. Fill-in the below table.  [14 points; need not show any work]

symbol

# protons

# neutrons

# electrons

Atomic mass

Charge

43Ca 2+

 

 

 

 

 

 

 

 

18

33

-2

 

 

52

 

90

+ 2

 

56

 

54

140

 

2. What is the average atomic mass based on the following hypothetical data.  [10 points]

Isotope       abundance
140La            80%
135La            15%
130La              5%

3. Define the term, isotope, and provide a hypothetical example.  [6 points]


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

Chemical formula

Chemical name

 

barium bicarbonate

 

Tin (IV) sulfide

FeCl3

 

Si2Br6

 

XeCl8