1) a Buffer Solution Contains 0

Mr. Citta – Honors Chemistry Name______Homework – 10-2-13 – Identifying oxidation states Date______Oxidation-Reduction Reactions. Read Section 4.4 (pages 128-30 ) and section 20.1 (pages 777-779, Text)

Identify the oxidation states of all the atoms in the following compounds. Name of compound

1. a) Cu2SO4 Cu = ____ S = _____ O = ______

b) CuSO4 Cu = ____ S = _____ O = ______c) FeO Fe = ____ O = ______

d) Fe2O3 Fe = ____ O = ______

e) Ag2CrO4 Ag = ____ Cr = _____ O = ______

f) Cu2Cr2O7Cu = ____ Cr = _____ O = ______

g) K2SO4 K = ____ S = _____ O = ______

h) H2CO2 H = ____ C = _____ O = ______i) HClO H = ____ Cl = _____ O = ______

j) HClO2 H = ____ Cl = _____ O = ______

k) HClO3 H = ____ Cl = _____ O = ______

l) HClO4 H = ____ Cl = _____ O = ______

m) KMnO4 K = ____ Mn = _____ O = ______

n) MgH2 Mg = ____ H = ______

o) CaC2O4 Ca= ____ C = _____ O = ______

p) Fe2(S2O3)3 Fe = ____ S = _____ O = ______

q) Na2S4O6 Na = ____ S = _____ O = ______r) **FeSCN+2 Fe= ____ S = ____ C = _____ N = ______(**in the problem above (FeSCN+2) is a cation with an overall charge of +2)

2. a) What is an oxidation? (**Look them up if you don’t know what they are already**)

b) How does an atom oxidize?

c) What is a reduction?

d) How does an atom reduce?

e) What is a reduction agent?

f) What is an oxidation agent? Mr. Citta – Honors Chemistry Name______Homework – 10-2-13 – Identifying oxidation states Date______(**assign oxidation states below – if you don’t know how to complete the ½ reactions, I’ll show you in the next instructional class.**) 3. Identify the specie that is reduced, and the specie that is oxidized in the following reactions. ( how the charges of all specie present in the reaction.) Then break the reaction into half-reactions below.

a.) Cl2(g) + 2NaBr(aq)  2NaCl(aq)+ Br2(l)

Reduction ½ reaction:

Oxidation ½ reaction:

What is the oxidation agent? The reducing agent?

______

-1 -2 -2 +2 b) MnO4 (aq) + S2O3 (aq) +  SO4 (aq) + Mn (aq) (in acidic solution)

Reduction ½ reaction:

Oxidation ½ reaction:

What is the oxidation agent? The reducing agent?

______

4. What does LEO the Lion do?? Explain. (you can use the internet to search for the answer.)

5. What does the Fox say???