An ideal gas is allowed to expand adiabatically until its volume increases by 50%. By approximately what factor is the pressure reduced? (g = 5/3.)
a. 1.5
b. 2.0
c. 2.5
d. 3.0
e. 3.5
B
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Which of the following is an example of a scientific model?
a. celestial sphere b. connected balls and rods representing chemical bonds of a DNA molecule c. topographical map d. All of the other choices are correct.
Compound Microscope: The distance between the object to be viewed and the eyepiece of a compound microscope is 18.0 cm. The focal length of its objective lens is 0.80 cm and the eyepiece has a focal length of 2.3 cm. The near-point distance of the person using the microscope is 25.0 cm. What is the magnitude of the total magnification of the microscope if it is designed for minimum eyestrain?
A. 120 B. 184 C. 200 D. 360 E. 480
Compared to sea level, water in an open pot in the mountains boils at
A) a higher temperature. B) a lower temperature. C) the same temperature. D) none of the above
A solution with a pH of 14 is
a. strongly acidic. b. weakly basic. c. strongly basic. d. weakly acidic.