UNIT 3 TEST #2 (ADV. CHEM.) - WRITTEN PART

Part 1 - Fill in the following chart.

	Name	Atomic #	Mass #	# of n^o	# 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 10²³ '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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