Chapter 20: Problem 3
Calcium and magnesium are essential for human life. Explain their importance.
Chapter 20: Problem 3
Calcium and magnesium are essential for human life. Explain their importance.
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Get started for freeNitrous oxide \(\left(\mathrm{N}_{2} \mathrm{O}\right)\) can be produced by thermal decomposition of ammonium nitrate: $$ \mathrm{NH}_{4} \mathrm{NO}_{3}(s) \stackrel{\mathrm{heat}}{\longrightarrow} \mathrm{N}_{2} \mathrm{O}(g)+2 \mathrm{H}_{2} \mathrm{O}(l) $$ What volume of \(\mathrm{N}_{2} \mathrm{O}(g)\) collected over water at a total pressure of 94.0 \(\mathrm{kPa}\) and \(22^{\circ} \mathrm{C}\) can be produced from thermal decomposition of 8.68 $\mathrm{g} \mathrm{NH}_{4} \mathrm{NO}_{3} ?\( The vapor pressure of water at \)22^{\circ} \mathrm{C}$ is 21 torr.
Write balanced equations describing the reaction of lithium metal with each of the following: $\mathrm{O}_{2}, \mathrm{S}, \mathrm{Cl}_{2}, \mathrm{P}_{2}, \mathrm{H}_{2}, \mathrm{H}_{2} \mathrm{O},\( and \)\mathrm{HCl} .$
Electrolysis of an alkaline earth metal chloride using a current of 5.00 \(\mathrm{A}\) for 748 seconds deposits 0.471 \(\mathrm{g}\) of metal at an electrode. Is the metal deposited at the cathode or the anode of the electrolytic cell? What is produced at the other electrode? What is the identity of the alkaline earth metal?
You travel to a distant, cold planet where the ammonia flows like water. In fact, the inhabitants of this planet use ammonia (an abundant liquid on their planet) much as earthlings use water. Ammonia is also similar to water in that it is amphoteric and undergoes autoionization. The \(K\) value for the autoionization of ammonia is \(1.8 \times 10^{-12}\) at the standard temperature of the planet. What is the pH of ammonia at this temperature?
Phosphoric acid \(\left(\mathrm{H}_{3} \mathrm{PO}_{4}\right)\) is a triprotic acid, phosphorous acid \(\left(\mathrm{H}_{3} \mathrm{PO}_{3}\right)\) is a diprotic acid, and hypophosphorous acid $\left(\mathrm{H}_{3} \mathrm{PO}_{2}\right)$ is a monoprotic acid. Explain this phenomenon.
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