Chemistry
9th Edition
ISBN: 9781133611097
Author: Steven S. Zumdahl
Publisher: Cengage Learning
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Textbook Question
Chapter 10, Problem 3ALQ
Explain the following: You add 100 mL water to a 500-mL round-bottom flask and heat the water until it is boiling. You remove the heat and stopper the flask, and the boiling stops. You then run cool water over the neck of the flask, and the boiling begins again. It seems as though you are boiling water by cooling it.
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There are three sets of sketches below, showing the same pure molecular compound (ammonia, molecular formula NH,) at three different temperatures. The
sketches are drawn as if a sample of ammonia were under a microscope so powerful that individual atoms could be seen. Only one sketch in each set is correct.
Use the slider to choose the correct sketch in each set. You may need the following information:
melting point of NH3: – 77.7 °C
boiling point of NH3: – 33.3 °C
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- 60. °C
- 89. °C
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Explain why water boils at higher temperature under higher pressure (pure substance
saturation temperature depends on pressure). Use knowledge of energy and energy
transferring at molecular or atomic level during the phase change of a substance. You do
not need to show calculations.
• (a) the amount of heat absorbed as 1 kg of saturated liquid water boils at 100°C. (b) the
amount of heat released as 1 kg of saturated water vapor condenses. Is a >b, a=b, or a
22) Evaporation of sweat requires energy and thus take excess heat away from the body. Some of the water that you
drink may eventually be converted into sweat and evaporate. If you drink a 20-ounce bottle of water (590g) that
had been in the refrigerator at 3.8 °C, how much heat is needed to convert all of that water into sweat and then to
vapor? (Note: Your body temperature is 36.6 °C. For the purpose of solving this problem, assume that the therm
properties of sweat are the same as for water.
Us, liquid water =
4.184 J/g °C
Cs, steam= 1.84 J/g °C
C3, ice = 2.09 /g °C
AHvap = 40.67 kJ/mol at 36.6 °C.
%3D
A Hus = 6.01 kJ/mol
A) 1420 kJ
B) 81 kJ
C) 1150 kJ
23) Based on the graph shown below, choose the correct statement about sublimation?
Gas
Liquid
sublimation
Solid
A) Sublimation is a phase transition from solid to gas
B) According to Hess Law, AHsub can be calculated as sum of AHvap and AHUS
C) Both A and B are correct
Chapter 10 Solutions
Chemistry
Ch. 10 - What are intermolecular forces? How do they differ...Ch. 10 - Define the following terms and describe how each...Ch. 10 - Compare and contrast solids, liquids, and gases.Ch. 10 - Prob. 4RQCh. 10 - What is a lattice? What is a unit cell? Describe a...Ch. 10 - What is closest packing? What is the difference...Ch. 10 - Describe, in general, the structures of ionic...Ch. 10 - Prob. 9RQCh. 10 - Prob. 10RQCh. 10 - Compare and contrast the phase diagrams of water...
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The...Ch. 10 - A certain form of lead has a cubic closest packed...Ch. 10 - Prob. 54ECh. 10 - You are given a small bar of an unknown metal X....Ch. 10 - A metallic solid with atoms in a face-centered...Ch. 10 - Titanium metal has a body-centered cubic unit...Ch. 10 - Barium has a body-centered cubic structure. 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