Ideal Gas Law: If a certain sample of an ideal gas has a temperature of 104°C and exerts a pressure of 2.3 × 104 Pa on the walls of its container, how many gas molecules are present in each cubic centimeter of volume? The ideal gas constant is R = 8.31 J/mol × K and Avogadro's number is NA = 6.022 × 1023 molecules/mol.
Fill in the blank(s) with the appropriate word(s).
4.4 × 1018 molecules
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Small glaciers that form along mountains in hollow depressions are called
a. cirque glaciers. b. mountain glaciers. c. caldera glaciers. d. moraines.
An electron moving perpendicular to a magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving?
A) 2.3 × 107 m/s B) 1.9 × 10-53 m/s C) 1.9 × 10-30 m/s D) 3.0 × 109 m/s E) 0.80 × 107 m/s
Which best describes the property of surface tension in the examples pictured here?
a. Neighboring molecules of the liquid bond to each other, forming a flexible atomic sheet at the surface. b. Molecules at the surface have different properties than atoms surrounded on all sides by other atoms. c. At a surface, the interaction between air molecules and the fluid create the surface tension. d. The surface tension pulls molecules out from the center of a liquid to the surface. e. The surface tension only occurs at high temperatures.
Which of the following information is required to compute the mass of a galaxy using the rotation curve method?
A) The age of the galaxy B) The distance of the galaxy from the nearest rich galaxy cluster C) The total number of stars in the galaxy D) The true sizes of the orbits of stars or gas clouds within the galaxy