How do paramagnetic materials differ from diamagnetic materials?
A)
They are the same.
B)
Paramagnetic molecules are metallic.
C)
Paramagnetic molecules don't have a permanent dipole moment.
D)
Paramagnetic molecules have a permanent dipole moment.
E)
Paramagnetic molecules are non-metallic.
D
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In a certain process a gas ends in its original thermodynamic state. Of the following, which is possible as the net result of the process?
A. It is adiabatic and the gas does 50 J of work B. The gas does no work but absorbs 50 J of energy as heat C. The gas does no work but loses 50 J of energy as heat D. The gas loses 50 J of energy as heat and does 50 J of work E. The gas absorbs 50 J of energy as heat and does 50 J of work
Considering that the Sun is about 1/100 AU in diameter and a typical planet like Earth is 1/10,000 AU, discuss whether or not our Solar System is crowded or empty
What will be an ideal response?
For all irreversible processes involving a system and its environment:
A. the entropy of the system does not change B. the entropy of the system increases C. the total entropy of the system and its environment does not change D. the total entropy of the system and its environment increases E. none of the above
If Venus and Earth outgassed a similar amount of CO2 early in their histories, why are their surface temperatures so different today?
a. Venus didn’t contain any water, so couldn’t be dissolved and converted into sediments. Therefore, the runaway greenhouse effect made its surface much hotter. b. Venus was closer to the Sun, water tended to be in the atmosphere rather than in oceans, and couldn’t be dissolved. Therefore, the runaway greenhouse effect made the surface of Venus much hotter c. Venus’s moon fell onto the planet with a catastrophic impact, producing massive ejecta and increasing the abundance of in the atmosphere. Therefore, the greenhouse effect made its surface much hotter. d. Venus didn’t have a detectable magnetic field, so the solar wind reached Venus’s surface and evaporated additional from the crust, increasing the greenhouse effect and making its surface much hotter.