Which of the following pairings usually forms molecular compounds? Select the correct answer below:
metal, nonmetal
nonmetal, nonmetal
metal, metal
none of the above

Describe the chemical reaction based on the chemical equation below. also, explain whether the equation is balanced.

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

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?