Chapter 9: Problem 25
When wet laundry is hung on a clothesline on a cold winter day, it will freeze but eventually dry. Explain.
Chapter 9: Problem 25
When wet laundry is hung on a clothesline on a cold winter day, it will freeze but eventually dry. Explain.
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Get started for freeConsider a sealed container half-filled with water. Which statement best describes what occurs in the container? a. Water evaporates until the air is saturated with water vapor; at this point, no more water evaporates. b. Water evaporates until the air is overly saturated (supersaturated) with water, and most of this water recondenses; this cycle continues until a certain amount of water vapor is present, and then the cycle ceases. c. Water does not evaporate because the container is sealed. d. Water evaporates, and then water evaporates and recondenses simultaneously and continuously. e. Water evaporates until it is eventually all in vapor form. Explain each choice. Justify your choice, and for choices you did not pick, explain what is wrong with them.
In solid KCl the smallest distance between the centers of a potassium ion and a chloride ion is \(314 \mathrm{pm} .\) Calculate the length of the edge of the unit cell and the density of KCl, assuming it has the same structure as sodium chloride.
Some ionic compounds contain a mixture of different charged cations. For example, some titanium oxides contain a mixture of \(\mathrm{Ti}^{2+}\) and \(\mathrm{Ti}^{3+}\) ions. Consider a certain oxide of titanium that is \(28.31 \%\) oxygen by mass and contains a mixture of \(\mathrm{Ti}^{2+}\) and \(\mathrm{Ti}^{3+}\) ions. Determine the formula of the compound and the relative numbers of \(\mathrm{Ti}^{2+}\) and \(\mathrm{Ti}^{3+}\) ions.
Barium has a body-centered cubic structure. If the atomic radius of barium is \(222 \mathrm{pm},\) calculate the density of solid barium.
Some ionic compounds contain a mixture of different charged cations. For example, wüstite is an oxide that contains both \(\mathrm{Fe}^{2+}\) and \(\mathrm{Fe}^{3+}\) cations and has a formula of \(\mathrm{Fe}_{0.950} \mathrm{O}_{1.00}\). Calculate the fraction of iron ions present as \(\mathrm{Fe}^{3+} .\) What fraction of the sites normally occupied by \(\mathrm{Fe}^{2+}\) must be vacant in this solid?
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