A) Given the following activity series: most active Ba, Mn, Cr, Cd, Sn, H, Bi, A

Question

A) Given the following activity series: most active Ba, Mn, Cr, Cd, Sn, H, Bi, Au, least active Mn(s) + 2Cr3+(aq) 3Mn 2+(aq) + 2Cr(s) 2Bi(s) + 6H+(aq) 3H2(g) + 2Bi3+(aq) 3Cd2+(aq) + 2Au (s) 3Cd(s) + 2Au(aq) Sn(s) + 2H+(aq) H2(g) + Sn2+(aq) 2Cr3+(aq) + 3Ba(s) 3 Ba2+(aq) + 2Cr(s) 2Au3+(aq) + 3H2(g) 6H+(aq) + 2Au(s) 3Mn 2+(aq) + 2Bi(s) 3Mn(s) + 2Bi2+(aq) Predict which of the following reactions occur (use yes or no for the answer):

B) Balance the following reaction and identify the reducing and oxidizing agents: I-(aq) + O2(g) + H2O(l) I2(s) + OH-(aq)

C) Balance the following reactions by placing coefficients in the blanks: Blank 1CrO42-(aq) + Blank 2 HSNO2-(aq) + 1H2O(l) Blank 3CrO2-(aq) +Blank 4 HSnO3-(aq) +Blank 5OH- Blank 6KMnO4(aq) + Blank 7NaNO2(aq) + 1H2O(l)Blank 8MnO2(s) + Blank 9NaNO3(aq) + Blank 10KOH(aq)

Explanation / Answer

A)

Mn(s) + 2Cr3+(aq) 3Mn 2+(aq) + 2Cr(s) = YES as Mn is more active than Cr

2Bi(s) + 6H+(aq) 3H2(g) + 2Bi3+(aq) = No, as H is more active than Bi

3Cd2+(aq) + 2Au (s) 3Cd(s) + 2Au(aq) = No, as Au is least active

Sn(s) + 2H+(aq) H2(g) + Sn2+(aq) = yes as Sn is more active than H

2Cr3+(aq) + 3Ba(s) 3 Ba2+(aq) + 2Cr(s) = Yes as Ba is most active

2Au3+(aq) + 3H2(g) 6H+(aq) + 2Au(s) = Yes as H is more active than Au

3Mn 2+(aq) + 2Bi(s) 3Mn(s) + 2Bi2+(aq) = No as Bi is less active than Mn

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