Lycoming College                                          Quiz 2                          Write Name on Back

Chem 110, 2002                                                                                             Upper Right

1.      Name the following elements:

Co_______________________         Cu___________________________

2.      Provide the symbol for each of the following:

silver_________________                  sulfur___________________

3.      The symbol for an ion of an element is

            a.         What element is it?  Symbol___________        Name________________________

b.                  How many protons are in its nucleus?___________________________________

c.                   How many neutrons are in its nucleus?__________________________________

d.                  How many electrons are in the ion?_____________________________________

e.                   Three isotopes of this element are known, with the following mass numbers and % abundance (in parentheses):      24(78.99%),      25(10.00%),             26(11.01%)

Calculate the average atomic mass for this element.  Show calculation.

4.      Name the following

B₂Cl₄___________________________________________________________________

FePO₄^.2H₂O_____________________________________________________________

5.      Provide formulas for

Ammonium dichromate____________________________________________________

Chromium(III) bromide___________________________________________________

6.   Comment briefly on how Dalton’s atomic theory explains the Law of Constant Composition.