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

7

14

7

7

7

14N

2.)

zinc - 65

30

65

35

30

30

65Zn

3.)

iron - 55

26

55

29

26

26

55Fe

4.)

iodine - 126

53

126

73

53

53

126I

5.)

titanium - 48

22

48

26

22

22

48Ti

6.)

tungsten - 184

74

184

110

74

74

184W

7.)

argon - 39

18

39

21

18

18

39Ar

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?    4.329 moles | 150.7 g = 652.4 grams SnO2
                                                                                         | 1 mole

9.) How many atoms are contained in 35.36 grams of potassium?    35.36 g | 1 mole = 0.9043 moles
                                                                                                             | 39.1 g
        0.9043 moles | 6.022 x 1023 atoms = 5.446 x 1023 atoms K
                             | 1 mole

10.)  What is the mass of 9.8 x 1023 molecules of CO2?   
9.8 x 10
23 'cules CO2 | 1 mole                  = 1.6 moles CO2
                                | 6.022 x 1023 'cules
1.6 moles CO2 | 44.0 grams = 70. grams CO2
                      | 1 mole

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 %.
20 x 0.9092 = 18.184
21 x 0.00257 = 0.05397
22 x 0.0882 = 1.9404
                     20.17837  ~  20.2 amu

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?        34

13.)  Phosphorus - 33 has an atomic number of 15.  How many neutrons does this isotope have?        18

14.)  Nickel - 60 has an atomic number of 28.  How many neutrons does this isotope have?        32

15.)  Carbon - 14 has 8 neutrons.  What is the atomic number of carbon - 14?        6

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

Part 4 - Name the element (including #) which has...
17.)  1 proton, 1 neutron, 1 electron        hydrogen - 2

18.)  30 neutrons, 26 electrons, 26 protons        iron - 56

19.)  4 neutrons, 3 protons, 3 electrons        lithium - 7

20.)  18 electrons, 22 neutrons, 18 protons         argon - 40

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