Assign oxidation numbers to all the atoms or ions in each of the following reactions. Then identify the reactant oxidized and the reactant reduced. a. 4 Al w) + 3 Oz () → 2 Al,O3) (8) b. Mg «) + 2 Agʻ (m) 2 Ag » + Mg² (m) (8) (8) c. 2 Al (0) + 6 H' (aq) - 2 AP" (ag) + 3 H2 (a)

Chemistry: The Molecular Science
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Chapter3: Chemical Reactions
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101. Assign oxidation numbers to all the atoms or ions in each of the following reactions.
Then identify the reactant oxidized and the reactant reduced.
a. 4 Al + 3 Oz (a)
2 Al,O, )
(8)
b. Mg (w) + 2 Ag' (wq)
2 Ag » + Mg² (»)
c. 2 Al (s)
+ 6 H' (aq)
- 2 Al*
+ 3 Hz
(aq)
(g)
d. Cl2 (a) + 2 Nal (ag) →
I2 (ma) + 2 NaCi
(aq)
e. MnO, (a) + 4 HCI (ng)
Cl2 + MnCl, cag + 2 H,O
(aq)
f. 2 Fe w) + O2 » + 2 H20 m → 2 Fe(OH): («)
(s)
(g)
102. Draw a detailed diagram of a galvanic cell that involves iron (III) metal and copper (II)
metal using sulphate as your anion for each solution and potassium chloride solution
for your salt bridge.
a. Indicate the direction of motion of the electrons and all ions.
b. Label the anode and the cathode.
c. Write the oxidation and reduction half reactions.
d. Write the overall (net) galvanic cell reaction
e. How many electrons are exchanged for each redox process?
f. Where does oxidation take place?
g. Where does reduction take place?
h. What is the purpose of the salt bridge?
i. Which electrode gets bigger and which gets smaller? Why?
Transcribed Image Text:101. Assign oxidation numbers to all the atoms or ions in each of the following reactions. Then identify the reactant oxidized and the reactant reduced. a. 4 Al + 3 Oz (a) 2 Al,O, ) (8) b. Mg (w) + 2 Ag' (wq) 2 Ag » + Mg² (») c. 2 Al (s) + 6 H' (aq) - 2 Al* + 3 Hz (aq) (g) d. Cl2 (a) + 2 Nal (ag) → I2 (ma) + 2 NaCi (aq) e. MnO, (a) + 4 HCI (ng) Cl2 + MnCl, cag + 2 H,O (aq) f. 2 Fe w) + O2 » + 2 H20 m → 2 Fe(OH): («) (s) (g) 102. Draw a detailed diagram of a galvanic cell that involves iron (III) metal and copper (II) metal using sulphate as your anion for each solution and potassium chloride solution for your salt bridge. a. Indicate the direction of motion of the electrons and all ions. b. Label the anode and the cathode. c. Write the oxidation and reduction half reactions. d. Write the overall (net) galvanic cell reaction e. How many electrons are exchanged for each redox process? f. Where does oxidation take place? g. Where does reduction take place? h. What is the purpose of the salt bridge? i. Which electrode gets bigger and which gets smaller? Why?
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