Chapter 16: Q113 AE (page 704)
When a person has a severe fever, one therapy used to reduce the fever is an “alcohol rub.” Explain how the evaporation of alcohol from a person’s skin removes heat energy from the body.
Evaporation causes cooling. Evaporation is an endothermic process.
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Consider the following electrostatic potential diagrams:
Rank the compounds from lowest to highest boiling point, and explain your answer.
The memory metal, nitinol, is an alloy of nickel and titanium. It is called a memory metal because after being deformed, a piece of nitinol wire will return to its original shape. (See Chemmatters, October 1993, pp. 4–7.) The structure of nitinol consists of a simple cubic arrayof Ni atoms and an inner penetrating simple cubic array of Ti atoms. In the extended lattice, a Ti atom is foundat the center of a cube of Ni atoms; the reverse is also true.
a. Describe the unit cell for nitinol.
b. What is the empirical formula of nitinol?
c. What are the coordination numbers (number of nearest neighbors) of Ni and Ti in nitinol?
A substance has the following properties:
Sketch a heating curve for the substance, starting at
A sample of dry nitrogen gas weighing 100.0g is bubbled through liquid water at 25.00C. The gaseous mixture of nitrogen and water vapor escapes at a total pressure of 700.0 torr. What mass of water has vaporized? (The vapor pressure of water at 25.00C is 23.8 torr.)
What is closest packing? What is the difference between hexagonal closest packing and cubic closest packing? What is the unit cell for each closest packing arrangement?
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