Problem 67
\(\mathrm{SF}_{6}\) exists, but \(\mathrm{OF}_{6}\) does not. Explain.
Problem 68
Explain why \(\mathrm{SCl}_{6}, \mathrm{SBr}_{6}\), and \(\mathrm{SI}_{6}\) cannot be prepared.
Problem 69
Sulfuric acid is a dehydrating agent. Write balanced equations for the reactions between sulfuric acid and (a) HCOOH, the following substances: (b) \(\mathrm{H}_{3} \mathrm{PO}_{4}\) (c) \(\mathrm{HNO}_{3}\), (d) \(\mathrm{HClO}_{3}\). (Hint: Sulfuric acid is not decomposed by the dehydrating action.)
Problem 70
Draw molecular orbital energy level diagrams for \(\mathrm{O}_{2}\) \(\mathrm{O}_{2}^{-},\) and \(\mathrm{O}_{2}^{2-}\)
Problem 71
Hydrogen peroxide is unstable and decomposes readily: $$ 2 \mathrm{H}_{2} \mathrm{O}_{2}(a q) \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}(l)+\mathrm{O}_{2}(g) $$ This reaction is accelerated by light, heat, or a catalyst. (a) Explain why hydrogen peroxide sold in drugstores comes in dark bottles. (b) The concentrations of aqueous hydrogen peroxide solutions are normally expressed as percent by mass. In the decomposition of hydrogen peroxide, how many liters of oxygen gas can be produced at STP from \(15.0 \mathrm{~g}\) of a 7.5 percent hydrogen peroxide solution?
Problem 72
Oxygen forms double bonds in \(\mathrm{O}_{2}\), but sulfur forms single bonds in \(\mathrm{S}_{8}\). Explain.
Problem 73
What are the oxidation numbers of \(\mathrm{O}\) and \(\mathrm{F}\) in HFO?
Problem 74
Compare the physical and chemical properties of \(\mathrm{H}_{2} \mathrm{O}\) and \(\mathrm{H}_{2} \mathrm{~S}\).
Problem 75
Concentrated sulfuric acid reacts with sodium iodide to produce molecular iodine, hydrogen sulfide, and sodium hydrogen sulfate. Write a balanced equation for the reaction.
Problem 76
Describe two reactions in which sulfuric acid acts as an oxidizing agent.
