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A practice test for Redox Reactions, Exercises of Chemistry

University of the East, Manila (UEM)Chemistry

A practice test for Redox Reactions

Typology: Exercises

2021/2022

Uploaded on 12/10/2022

gerald-angelo-deguinio
gerald-angelo-deguinio 🇵🇭

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ANALYTICAL CHEMISTRY – ACH 2103
Seatwork: Balancing Redox Half Equation
Names: DEGUINIO, Gerald Angelo D. Section: BI3A
EXCONDE, Joaquin Adrian M.
VILLAFUERTE, Neil Patrick V.
A. CH3OH(aq) CO2(g) (acidic)
Assign Oxidation Number:
CH3OH(aq) CO2(g)
C = -2 C = +4
OXIDIZED
Add electrons: CH3OH(aq) CO2(g) + 6e-
Add ions (H+): CH3OH(aq) CO2(g) + 6e- + 6H+
Add water:
CH3OH(aq) + 3H2O CO2(g) + 6e- + 6H+
BALANCED EQUATION:
CH3OH(aq) + 3H2O CO2(g) + 6e- + 6H+
B. NO3- (aq) NH4+(aq) ( acidic )
Assign Oxidation Number:
NO3- (aq) NH4+(aq)
N = +5 N = -3
REDUCED
-2 +3 -2 +1 = 0 4 -4 = 0
5 -6 = -1 -3 +4 = +1
pf3

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ANALYTICAL CHEMISTRY – ACH 2103 Seatwork: Balancing Redox Half Equation Names : DEGUINIO, Gerald Angelo D. Section : BI3A EXCONDE, Joaquin Adrian M. VILLAFUERTE, Neil Patrick V. A. CH 3 OH(aq) CO2(g) (acidic) Assign Oxidation Number: CH 3 OH(aq) CO2(g) C = - 2 C = + OXIDIZED Add electrons: CH 3 OH(aq) CO2(g) + 6e

Add ions (H+): CH 3 OH(aq) CO2(g) + 6e

  • 6H

Add water : CH 3 OH(aq) + 3H 2 O CO2(g) + 6e

  • 6H

BALANCED EQUATION : CH 3 OH(aq) + 3H 2 O CO2(g) + 6e

  • 6H

B. NO 3 -^ (aq) NH 4 +(aq) ( acidic ) Assign Oxidation Number: NO 3

(aq) NH 4

(aq) N = +5 N = - 3 REDUCED

  • 2 + 3 - 2 +1 = 0 4 - 4 = 0 5 - 6 = - 1 - 3 +4 = +

Add electrons: NO 3

  • (aq) +^ 8e - NH 4 + (aq) Add ions (H+): NO 3

(aq) +^ 8e

  • 10H

NH 4

(aq) Add water : NO 3

(aq) +^ 8e

  • 10H

NH 4

(aq)^ +^ 3H 2 O BALANCED EQUATION : NO 3

(aq) +^ 8e

  • 10H

NH 4

(aq)^ +^ 3H 2 O C. Fe 3+(aq) Fe (^) (s) ( basic ) Assign Oxidation Number: Fe 3+ (aq) Fe^ (s) Fe = +3 Fe = 0 REDUCED Add electrons: Fe 3+ (aq) +^ 3e

Fe (^) (s) BALANCED EQUATION : Fe 3+ (aq) + 3e

Fe (^) (s) D. V2+(aq) VO 3 –^ (aq) ( basic ) Assign Oxidation Number: V 2+ (aq) VO 3 - (aq) V = + 2 V = + OXIDIZED +3 0

  • 2 5 - 6 = - 1