A balloon contains two gases: oxygen and nitrogen. According to the second law of thermodynamics, which event can never occur spontaneously? A. molecules of the two gases mixing evenly throughout the balloon
B. molecules of the two gases leaking out small openings in the skin of the balloon
C. molecules of the two gases traveling at a variety of speeds
D. molecules of the two gases separating to opposite ends of the balloon

D

Explanation

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

One splits the atoms and molecules  the other combines them