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SELF QUIZ ANSWERS

Atomic weights: oxygen 16.0; sulfur 32.1

1. Write the proper isotopic symbol for a phosphorus atom containing 15 protons and 16 neutrons.

    31P (a complete isotopic symbol would also include the atomic number underneath the mass number)

2. Rutherford's experiment "discovered":
    a. protons
    b. atoms
    c. neutrons
    d. nuclei
   e. electrons

3. Evidence that atoms contain electrons came from:
    a. alpha scattering experiments
    b. Rutherford
    c. Dalton
    d. cathode ray experiments

4. What is the weight in grams of 1.0 x 105 SO2 molecules?

    1.1 x 10-17 g

5. Which atomic model allows for a larger variety of energy levels?
    a. Bohr
    b. wave mechanical

6. Fill in the blanks:

NAME

MASS (amu)

CHARGE

electron

negligible

1-

proton

1

1+

neutron

1

0

 

7.   If one mole of a compound weighs 85 grams, what is the weight of one molecule in a.m.u.?

             85 a.m.u.

8.              Fill in the blanks.

  

 

SYMBOL

 

   #p

 

   #n

 

   #e

 

CHARGE

 

MASS #

 

13N

 

 7

 

 6

 

 7

 

 0

 

 13

 

 23Mg

 

12

 

 11

 

 12

 

0

 

23

 

 33S2-

 

 16

 

17

 

 18

 

-2

 

33

 

66Zn2+

 

 30

 

 36

 

 28

 

 +2

 

 66

 

 

9.              5.7 x 10-7 moles of Hg contain how many atoms?

 

         3.4 x 1017 atoms of Hg 

 

10.         What is the weight in grams of 1.46 moles of NaI?

    

        219 g of NaI  (the formula weight of NaI = 149.9 g/mol)

 

 

 

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