Chem 3A - Burdge Worksheet-Chapter 17- Redox Reactions Page 7 of 7 5. (6 pts) Gi

Question

Chem 3A - Burdge Worksheet-Chapter 17- Redox Reactions Page 7 of 7 5. (6 pts) Given the balanced half reactions in acidic conditions, write the balanced overall equation in basic conditions. A120(s) + 7 H2O(l)-2 [Al(OH)4] (aq) + 6H+ (aq) + 4e 0:8) +4H(ag)+4e2H20(aq) Show Work: Simplified: Series of Activity Metals Refer to the Activity Series of Metals for Questions 6-7 6. Determine whether or not each redox reaction occurs sponta neously in the forward direction. (a) (2 pts) Fe(s) +Cu2+(aq) Fe2+(aq) + Cu(s) K(s) Ca(s) Na (s K(aq)+e Ca (aq) +2e Na (aq) +e A. Spontaneous B. Not Spontaneous (b) (2 pts) Sa(s) +2 Na (aq)S(a) +2 Na(s) Al(s)- Al"(aq) + 3e Mn(s) Mn (aq) +2e A. Spontaneous B. Not Spontaneous aq)+3e (e) (2 pts) Pb(s) +Mn2 (ag) Pb(a)+ Ma(s) Ni (s)- Ni, (aq) + 2e Sn(s) -- Sn77 (aq) + 2e A. Spontaneous B. Not Spontaneous (d) (2 pts) 2Al(s) +6H+(aq)-2AP+(aq) +3H2(g) +2e A. Spontaneous B. Not Spontaneous Au(s)Au(aq) +3e 7. (5 pts) Which of these metals would not react with HC1? Justify your reasoning based on the Activity Series O Magnesium (Mg) O Silver (Ag)

Explanation / Answer

Q5

in order to balance this, first add both equaitons

Al2O(s) + 7H2O(l) + O2(g) + 4H+(aq) + 4e- = 2[Al(OH)4]-(aq) + 6H+(aq) + 4e- + 2H2O(aq)

simplify

Al2O(s) + 7H2O(l) + O2(g)= 2[Al(OH)4]-(aq) + 2H+(aq)+ 2H2O(aq)

add OH- for basic balance

2OH-(aq)+ Al2O(s) + 7H2O(l) + O2(g)= 2[Al(OH)4]-(aq) + 2H+(aq)+ 2H2O(aq) + 2OH-(aq)

simplify

2OH-(aq)+ Al2O(s) + 7H2O(l) + O2(g)= 2[Al(OH)4]-(aq) + 2H2O(aq) + 2H2O(l)

get rid of water

2OH-(aq)+ Al2O(s) + 7H2O(l) + O2(g)= 2[Al(OH)4]-(aq) + 2H2O(aq) + 2H2O(l)

note thta water will no tbe produced as "aqueous" so:

2OH-(aq)+ Al2O(s) + 3H2O(l) + O2(g)= 2[Al(OH)4]-(aq)

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