Which of the following isotopes is radioactive?
A) Carbon-12
B) Carbon-14
C) both of these
D) neither of these
Answer: B
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Why does iodine, I2(s), spontaneously sublime at room temperature?
A) The contact of iodine, I2(s), with the water vapor in the air causes the sublimation process. B) Iodine, I2(s), pulls Image from the air as it self-oxidizes under sublimation to I2(g). C) There is an increase in entropy as solid iodine, I2(s), sublimes into iodine vapor, I2(g), because in the gaseous phase energy is more readily dispersed. D) The reaction of I2(s) subliming to I2(g) is highly exothermic and therefore proceeds spontaneously.
Quasars are____
a. spiral galaxies with unusually luminous nuclei b. elliptical galaxies with very broad emission lines c. explained by the double-exhaust model d. extremely luminous objects with high redshifts e. glowing green gases due to excitation from energy from an active core
Ideal Gas Law: A sealed container holds 0.020 moles of ideal nitrogen (N2) gas, at a pressure of 1.5 atm and a temperature of 290 K. The atomic mass of nitrogen is 14.0 g/mol. How many molecules of nitrogen are in the container? (R = 8.31 J/mol ? K, 1 atm = 101 kPa)
A. 1.5 × 1021 mol B. 3.0 × 1021 mol C. 6.0 × 1021 mol D. 1.2 × 1022 mol E. 2.4 × 1022 mol
Substance A has a density of 3 g/cm3 and substance B has a density of 4 g/cm3. In order to obtain equal masses of these two substances, the ratio of the volume of A to the volume of B will be equal to
A) 1 : 4 B) 4 : 3 C) 3 : 4 D) : 1 E) 1 : 3