Which of the following is the most common gas in the troposphere
a. carbon dioxide
b. nitrogen
c. oxygen
d. water vapor

In which phase(s) do the molecules take the shape of the container?

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?