Which contains more moles of material: 80 grams of helium gas (He, having atomic weight 4.0 g/mol) or 400 grams of argon gas (Ar, having atomic weight 40 g/mol)?
A) helium
B) argon
C) Both contain the same number of moles.
Answer: A
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We should expect galaxies to collide fairly often because
a. they are large with respect to their separation distances. b. galaxies contain large amounts of neutral hydrogen. c. galaxies occur in clusters. d. they are large with respect to their separation distances and galaxies occur in clusters. e. None of the other choices are correct.
If you draw a spacetime diagram, the worldline of an object that is stationary in your reference frame is
A) vertical. B) horizontal. C) slanted. D) curved. E) a circle.
The carbon dioxide cycle is an example of
A) positive feedback B) negative feedback C) bipolar feedback D) a chaotic system
The jovian planets in our solar system are ________
A) Jupiter, Saturn, Uranus, and Neptune B) Mercury, Venus, Earth, and Mars C) Io, Europa, Ganymede, and Callisto D) Pluto and Eris