chemistry 10 quick questions 1
Question 1: Phosphorus displays a wide range of oxidation numbers. Determine the oxidation number of phosphorus in each of the following species. Enter your answer in form “charge value” (for example “+2”).
1. PH3:
2. PCl3:
3. PCl5:
4. P4:
5. P4O10:
6. P2H4:
Question 2: For pair of species, select the one that is the better oxidizing agent under standard conditions: Au3+ or Ag+. (Select a or b)
a) Ag+
b) Au3+
Question 3: Which of the following are redox reactions?
I. 2 N2 + 3 H2 → 2 NH3
II. 4 Al + 3 O2 → 2 Al2O3
III. 2 NO2 → N2O4
IV. FeCl3 (aq) + 6 NH3(aq) → Fe(NH3)63+ (aq) + 3 Cl- (aq)
V. Cu2+ + Zn → Cu + Zn2+
a) I, II, and IV
b) I, II, and V
c) I and II
d) I, IV, and V
e) All but III
Question 4: For the reaction given below, identify the anode and describe what happens to the electrode as the reaction continues. 3Fe(s) + Cr2O72-(aq) + 14 H+(aq) → 3Fe2+(aq) + 2 Cr+3(aq) + 7H2O(l) (Multiple Choice)
a) Fe, converted to Fe2+; electrode gains mass.
b) Passive electrode at which Cr2O72-(aq) is oxidized; electrode is unchanged.
c) Fe electrode; no change.
d) Fe electrode at which Cr+3 is oxidized; electrode is unchanged.
e) Fe, converted to Fe2+; electrode decreases in size.
Question 5: See attachment
Question 6: Calculate E° for the reaction: S2- + 4 Cl2 + 12 H2O →SO42- + 8 Cl- + 8 H3O+
E°SO42-/S2-, H3O+ = +0.149, E°Cl2/Cl- = +1.358
Round your answer to three significant figures: __________V
Question 7: Use standard reduction potentials to calculate ΔG° for the reaction: 8 NO + 3 H2O →2 NO3- + 3 N2O + 2 H3O+
E°NO3-/NO, H3O+ = +0.957, E°NO/N2O, H3O+ = +1.591
____________kJ
Question 8: A cell that consists of a standard hydrogen half-cell and a Cu/Cu2+ half-cell has Eo = 0.34 V. If the cell contains 0.00266 M concentrations of HCl and CuSO4, what potential does it produce?
____________V
Question 9: Given that Eo = -0.34 V for the reduction of Tl+ to Tl, find the voltage developed by a cell consisting of Tl metal dipping in an aqueous solution that is 0.41 M in Tl+, connected by a porous bridge to a 0.57 M aqueous solution of HCl in contact with a Pt electrode over which H2 gas is bubbling at p = 0.80 bar.
____________V
Question 10: See attachment
