25Which of the following statements is wrong about water: a. Water has a unique ability to dissolve many organic and inorganic compounds. O b. Water expands when it freezes. This is related to the crystal structure of ice. O. Virtually no water is pure; it can only be made in a laboratory. O d. 80 elements have been detected in seawater. O e. Chlorine, sodium, magnesium and boron are commercially extracted from sea water. O f. None of the above Previous page

25Which of the following statements is wrong about water: a. Water has a unique ability to dissolve many organic and inorganic compounds. O b. Water expands when it freezes. This is related to the crystal structure of ice. O. Virtually no water is pure; it can only be made in a laboratory. O d. 80 elements have been detected in seawater. O e. Chlorine, sodium, magnesium and boron are commercially extracted from sea water. O f. None of the above Previous page

Chemistry & Chemical Reactivity

9th Edition

ISBN:9781133949640

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter13: Solutions And Their Behavior

Section: Chapter Questions

Problem 22PS: Hydrogen gas has a Henrys law constant of 7.8 104 mol/kgbar at 25 C when dissolving in water. If...

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The sugar fructose contains 40.0% C, 6.7% H, and 53.3% O by mass. A solution of 11.7 g of fructose in 325 g of ethanol has a boiling point of 78.59 C. The boiling point of ethanol is 78.35 C, and Kb for ethanol is 1.20 C/m . What is the molecular formula of fructose?
Explain the following on the basis of the behavior of atoms and/or ions. a. Cooking with water is faster in a pressure cooker than in an open pan. b. Salt is used on icy roads. c. Melted sea ice from the Arctic Ocean produces fresh water. d. CO2(s) (dry ice) does not have a normal boiling point under normal atmospheric conditions, even though CO2 is a liquid in fire extinguishers. e. Adding a solute to a solvent extends the liquid phase over a larger temperature range.
Hydrogen gas has a Henrys law constant of 7.8 104 mol/kgbar at 25 C when dissolving in water. If the total pressure of gas (H2 gas plus water vapor) over water is 1.00 bar, what is the concentration of H2 in the water in grams per milliliter? (See Appendix G for the vapor pressure of water.)
Starch contains CC, CH, CO, and OH bonds. Hydrocarbons have only CC and CH bonds. Both starch and hydrocarbons can form colloidal dispersions in water. Which dispersion is classified as hydrophobic? Which is hydrophilic? Explain briefly.
Explain the following on the basis of the behavior of atoms and/or ions. a. Cooking with water is faster in a pressure cooker than in an open pan. b. Salt is used on icy roads. c. Melted sea ice from the Arctic Ocean produces fresh water. d. CO2(s) (dry ice) does not have a normal boiling point under normal atmospheric conditions, even though CO2 is a liquid in fire extinguishers. e. Adding a solute to a solvent extends the liquid phase over a larger temperature range.
Which of the following gases is expected to be most soluble in water? Explain your reasoning. (a) CH4 (b) CCI4 (c) CHCI3
It is possible to balance a paper clip on the surface of water in a beaker. lf you add a bit of soap to the water, however, the paper clip sinks. Explain how the paper clip can float and why it sinks when soap is added.
Dissolving 3.0 g of CaCl2(s) in 150.0 g of water in a calorimeter (Figure 5.12) at 22.4 °C causes the temperature to rise to 25.8 °C. What is the approximate amount of heat involved in the dissolution, assuming the specific heat of the resulting solution is 4.18 J/g °C? Is the reaction exothermic or endothermic?
The solubility of lead nitrate at 100C is 140.0 g/100 g water. A solution at 100C consists of 57.0 g of lead nitrate in 64.0 g of water. When the solution is cooled 10C to 25.0 g of lead nitrate crystallize out. What is the solubility of lead nitrate in g/100 g water at 10C?
Although Al(OH)3 is insoluble in water, NaOH is very soluble. Explain in terms of lattice energies.
The solubility of nitrogen in water is 8.21 104 mol/L at 0C when the N2 pressure above water is 0.790 atm. Calculate the Henrys law constant for N2 in units of mol/L atm for Henrys law in the form C = kP, where C is the gas concentration in mol/L. Calculate the solubility of N2 in water when the partial pressure of nitrogen above water is 1.10 atm at 0C.