The "billiard ball model" of the atom is associated with a scientist named ______________
Fill in the blank(s) with correct word
Dalton
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If the Moon crosses Earth's shadow at the center of the umbra, how long will the entire eclipse last from start to finish?
a. 2 to 3 minutes b. 7 minutes c. 1 hour 45 minutes d. 2 hours e. 6 hours
Molecular Speeds: Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, the average molecular kinetic energy of oxygen molecules, compared to that of hydrogen molecules,
A. is greater. B. is less. C. is the same. D. cannot be determined without knowing the pressure and volume.
Two moons orbit a planet in nearly circular orbits. Moon A has orbital radius r, and moon B has orbital radius 4r. Moon A takes 20 days to complete one orbit. How long does it take moon B to complete an orbit?
A) 20 d B) 40 d C) 80 d D) 160 d E) 320 d
Water vapor in the air can condense when the air
A) cools above its dew point temperature. B) temperature increases. C) temperature drops below its dew point temperature. D) none of the above