Practice Problems Chpt. 4-6 Solutions

Practice Problems Chpt. 4-6 Solutions

1. For each of the following reactions, write a balanced molecular, ionic and net ionic equation. You must include state symbols. If no reaction occurs write no reaction.

(a) molec. 2HNO3 (aq) + Ba(OH)2 (aq) " 2H2O (l) + Ba(NO3)2 (aq)

Ionic 2H+ (aq) + 2NO3- (aq) + Ba2+(aq) + 2OH- (aq) " 2H2O (l) + Ba2+ (aq) + 2NO3- (aq)

Net ionic H+ (aq) + OH- (aq) " H2O (l)

(b) molec. BaCl2 (aq) + Na2SO4 (aq) " BaSO4 (s) + 2NaCl (aq)

Ionic Ba2+ (aq) + 2Cl- (aq) + 2Na+(aq) + SO42- (aq) " BaSO4 (s) + 2Na+ (aq) + 2Cl- (aq)

Net ionic Ba2+ (aq) + SO42- (aq) " BaSO4 (s)

Ionic H+ (aq) + HSO4- (aq) + 2K+(aq) + S2- (aq) " H2S (g) + 2K+ (aq) + SO42- (aq)

Net ionic H+ (aq) + HSO4- (aq) + S2- (aq) " H2S (g) + SO42- (aq)

(d) molec. NH3 (aq) + HCl (aq) " NH4Cl (aq)

Ionic NH3 (aq) + H+ (aq) + Cl- (aq) " NH4+ (aq) + Cl- (aq)

Net ionic H+ (aq) + NH3 (aq) " NH4+ (aq)

(e) molec. 2HBr (aq) + Na2CO3 (aq) " H2O (l) + CO2 (g) + 2NaBr (aq)

Ionic 2H+ (aq) + 2Br- (aq) + 2Na+(aq) + CO32- (aq) " H2O (l) + CO2 (g) 2Na+ (aq) + 2Br- (aq)

Net ionic 2H+ (aq) + CO32- (aq) " H2O (l) + CO2 (g)

(f) molec. Zn (s) + H2SO4 (aq) " H2 (g) + ZnSO4 (aq)

Ionic Zn (s) + H+ (aq) + HSO4- (aq) " H2(g) + Zn2+ (aq) + SO42- (aq)

Net ionic Zn (s) + H+ (aq) + HSO4- (aq) " H2(g) + Zn2+ (aq) + SO42- (aq)

2. 3.70 % H, 37.8 % P, 58.5 % O

3. C8H10N4O2

4. 3.46 x 10-22 g

5. 4.27 x 1014

6. 16.3 g

7. 3.44 x 10-2 mol

8. 2.17 g LiBr produced

0.826 g Li remain unreacted

9. 11.7 g KCl produced

10. 28.4OC

11. 0.876 J/g OC

12. 73.93 kJ of heat produced