May+18+-22+2009+Week+12





Work/Review In class

1. Draw the number line I constantly use. Write gain electrons and an arrow, draw lose elections and an arrow. 2. What does LEOGER stand for? 3. Finish these phrases: gained electrons appear on the _ side of a chemical equation. Lost electrons appear on teh _ side of a chemical equation. 3. Write out all of the oxidation state rules we've gone over 4 times now. 4. Figure out the oxidation state of all of the elements in the following ions: NO3 -1, NO2 -1, SO4 -2, SO3 -2, CO3 -2, PO4 -3, CN -1, CNO -1,

5. Figure out the oxidation state of all the elements in the following nuetral compounds. Br2, I2, Cl2, Mn(s), Al(s), Ne, He

C6H12O6, P2O5, N2O5, CH4, SiH4, CrCl3, LiF, MnO2, MoO2, WO2

6. Balance the following redox reactions occuring in acidic solution. Cr2O7 2-(aq) + HNO2(aq) --> Cr 3+(aq) + NO3 -1(aq) (acidic) , IO3 -1 + Fe +2 --> I2 + Fe 3+, ClO4 -1 + Cl -1 --> ClO3 -1 + Cl2

7. Balance the following redox reactions occuring IN BASIC solution: ClO -1 + Cr(OH)4 -1 ---> CrO4 -2 + Cl -1, NO2 -1 + Al(s) --> NH3 + AlO2 -1