Why is it necessary to run tlc in a closed container and to have the interior vapor saturated with the solvent?.

Are hallucinogen a clinically useful drugs?

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

If a solution had a ph of 7 what is the solution