it Chemistry z02 Worksheet-Eleetrochemistry Name: Grade: Give the oxidation numb
ID: 636337 • Letter: I
Question
it Chemistry z02 Worksheet-Eleetrochemistry Name: Grade: Give the oxidation number for each atom in the following: Bra, CuCla, CH, CO, BrO, co, so,, Mno,Cro, HaPO 1. 2. Which of the folloying are redox n78- ra-z+re react b. C(s)+0a(g)C02 (g) d. Cu (aq)+ 4NH, (aq)Cu(NH4 (aq) e. 3Cu(s)+ 8H (aq)+2 NO, (aq) >3Cu (a)+ 2 NO() +4 HO) 3. Balance the following redox reaction: In base: I (aq)+ so, (a) , (s) +S (s) Use the table of standard reduction potentials for the following exercises. 4. Predict if the following will occur under standard conditions, if so, write the products with correct phases: a) HCl (aq) +Au (s) b) HCI (aq) + Na (s) c) Aus+ (aq) + Na (s) 5. Find a reagent that can oxidize Bri to Bra but cannot oxidize Cl+ to Cl.. 6. Assuming standard conditions, indicate which of the following is true: a. Ha (g) can reduce Ag (aq). b. Ha (g) can reduce Ni2 (aq). c. Fea (aq) can reduce Cu2(aq). d. H (aq) can oxidize Mg(s). e. Pba (aq) can oxidize Ni(s). You decide to construct a zinc/aluminum galvanic cell in which the electrodes are connected by a wire and the solutions are connected with a salt bridge. One electrode consists of an aluminum bar in a 1.0 M solution of aluminum nitrate. The other electrode consists of zinc bar in a 1.o M solution of zinc nitrate. 7. a. Which electrode is the cathode and which is the anode? b. What is the direction of electron flow? c. What chemical reactions are occurring at each electrode? d. What is the overall balanced chemical reaction?Explanation / Answer
1)
Br2 - 0
CuCl2 - Cu(+2), Cl(-1)
CH4 - C(-4),H(+1)
CO2 - C(+4),O(-2)
Br2O - Br(+1),O(-2)
CO32- - C(+4),O(-2)
SO42- - S(+6),O(-2)
MnO4- - Mn(+7),O(-2)
Cr2O7-2 - Cr(+6),O(-2)
H2PO4-2 - H(+1),P(+4),O(-2)
Your answers were right except that you didnt mention oxidation for single atom.
2)
a) Yes - Reactants are in elemental state products are in combined state with changed oxidation states
b) Yes - Reactants are in elemental state products are in combined state with changed oxidation states
c) Yes - Reduction of alkene to alkanes is redox
d) No - Complex compound formation isnt redox reaction
e) No - No visible oxidation state
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