Today is 17 July 2009 -- We are learning to balance chemical equations

After discussing reaction yield, I taught you the algebraic method to balance equations.  (Refer to "CHEM Class Notes")  I gave you some problems to solve in class and I promised to give you more to practice at home.  Here are four more:

1.  Al + CuO --> Al(sub2)O(sub3) + Cu

2.  Fe(sub2)(SO(sub4))(sub3) + KSCN --> K(sub3)Fe(SCN)(sub6) + K(sub2)SO(sub4)

NOTE:  In the first term, there is a sulfate group (SO(sub4)) taken 3 times. 

3.  CaCl(sub2) + AgNO(sub3) --> AgCl + Ca(NO(sub3))(sub2)

4.  C(sub6)H(sub5)COOH + O(sub2) --> CO(sub2) + H(sub2)O