UNIT 3 TEST #2 (ADV. 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 SnO2?

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 %.

Part 3 - Answer the following questions.
12.)  Sulfur has an atomic number of 16.  What is the mass number of the isotope of sulfur that contains 18
        neutrons?

13.)  Phosphorus - 33 has an atomic number of 15.  How many neutrons does this isotope have?

14.)  Nickel - 60 has an atomic number of 28.  How many neutrons does this isotope have?

15.)  Carbon - 14 has 8 neutrons.  What is the atomic number of carbon - 14?

16.)  Silicon - 30 has 14 protons.  How many electrons does an atom of silicon - 30 have?

Part 4 - Name the element (including #) which has...
17.)  1 proton, 1 neutron, 1 electron

18.)  30 neutrons, 26 electrons, 26 protons

19.)  4 neutrons, 3 protons, 3 electrons

20.)  18 electrons, 22 neutrons, 18 protons

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