SOLVED

91) Write a balanced half equation for the following couple: NO3- | NH4+(acidic) A) NO3- + 3 H2O → NH4+ + 10 H+ + 8 e- B) NO3- + 4 H+ + 3 e- → NH4+ + 3 H2O C) NO3- + 4 H+ → NH4+ + 3 H2O + e- D) NO3- + 8 H+ + 8 e- → NH4+ + 3 H2O E) NO3- + 10 H+ + 8 e- → NH4+ + 3 H2O 92) Write a balanced half equation for the following couple: NO3- NO2- (basic) A) NO3- + 2 H+ + 2 e- → NO2- + H2O B) NO3- + 2 H2O + 2 e- → NO2- + 2 OH- + 2 H2O C) NO3- + H2O + 2 e- → NO2- + 2 OH- D) NO3- + H2O + e- → NO2- + OH- E) NO3- + H2 + e- → NO2- + OH- 93) Give the molecular shape of NO3-. A) trigonal pyramidal B) trigonal planar C) tetrahedral D) linear E) octahedral 94) The pollution process in which oxygen depletion of natural waters by increased algae growth occurs because of contaminants such as excess phosphates is referred to as ________. A) anoxia B) biodegradation C) eutrophication D) phosphorylation E) saponification 95) What is the pH of a solution labeled “0.30 M Hydroxylamine”? [Kb is 9.1 × 10-9] A) 4.38 B) 6.60 C) 7.38 D) 8.23 E) 9.72 96) What volume of 17 M nitric acid is required to dissolve 15 g of copper by a reaction for which the products are aqueous copper(II) nitrate, nitric oxide gas, and water? Assume 100% reaction. A) 93 mL B) 79 mL C) 53 mL D) 37 mL E) 21 mL 97) In the compound dinitrogen monoxide, sometimes used as a dental anesthetic, the oxidation state of nitrogen is ________. A) +1 B) -1 C) +2 D) -2 E) 0 98) How much H2 (in liters) is produced at 65°C and 670. torr by the reaction of 75.7 g of zinc? Zn(s) + 2 H+(aq) → Zn2+(aq) + H2(g) A) 188 L B) 2.33 L C) 9.22 L D) 36.4 L E) 95.8 L 99) How much hydrogen (in liters at STP) is required to change 857 kg of diisobutylene to isooctane? Molar mass of diisobutylene is 112.2 grams. CH3C(CH3)2CH=C(CH3)2 + H2 → CH3C(CH3)2CH2CH(CH3)2 A) 15.4 L B) 1.71 × 105 L C) 8.55 × 104 L D) 3.42 × 105 L E) 30.8 L 100) How much H2 (in liters) is produced at 45 °C and 770. torr by the reaction of 45.7 g of zinc? Zn(s) + 2 H+(aq) → Zn2+(aq) + H2(g) A) 139 L B) 15.7 L C) 18.0 L D) 31.4 L