UNIT 3 TEST #1 (REG. CHEM.) - WRITTEN PART

Part 1 - Fill in the following chart.

 

Name

Atomic #

Mass #

# of no

# of e-

# of p+

Symbol

1.)

nitrogen - 14

 

 

 

 

 

 

2.)

 

30

 

35

 

 

 

3.)

 

 

55

 

26

 

 

4.)

 

53

 

73

 

 

 

5.)

 

22

48

 

 

 

 

6.)

tungsten - 184

 

 

 

 

 

 

7.)

argon - 39

 

 

 

 

 

 

Part 2 - Solve the following problems.  Show your work!  Don't forget SF's and units with your answer!
8.)  What is the mass of 4.329 moles of tin?

 

9.) How many atoms are contained in 35.36 grams of potassium?

 

10.)  What is the mass of 9.8 x 1023 molecules of CO2?

 

11.)  Using the following data, calculate the average atomic mass of neon.  Round your answer to one place to the
        right of the decimal point.

        Neon - 20 has a percent abundance of 90.92 %.
        Neon - 21 has a percent abundance of 0.257 %.
        Neon - 22 has a percent abundance of 8.82 %.

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