3/31 Chemistry update and homework due 4/7

Hi folks,

Today we stepped into another aspect of chemistry with oxidation and reduction reactions.  We went over the rules of finding oxidation numbers today and we will get into half reactions and electron transfers next week.  

From here on out, the material should be quite a bit easier.  We've finished stoichiometry with is some of the hardest material of the year.  After oxidation and reduction, we will be covering acids and bases and then we will get to the gas laws.

For homework this week I'd like you to find the oxidation numbers for each of the elements in the following molecules.

1.  LiNH2

2.  N2H2

3. Ca(NO2)2

4. CO2

5. BF4-  (Notice the - on this one)

6. PO4 ^3-

7.  ClNO

8.  S8

9.  MnO2

10. H2SO4

11. CO3 2-

12.  MgCl2

13.  KNO3

14. SF6

Answers:

1. Li +1 N -3 H +1

2. N-1 H +1

3. Ca +2 N +3 O -2

4. C +4 O -2

5. B +3  F -1

6. P +5 O -2

7. Cl -1 N +3 O -2

8. 0

9. Mn +4 O -2

10.  H +1 S +6 O -2

11. C +4 O -2

12. Mg +2 Cl -1

13.  K +1 N +5 O -2

14. S +6 F -1