What kinds of substances cause the destruction of ozone?
substances that contain carbon and oxygen
substances that contain chlorine and bromine
substances that contain nitrogen and phosphorus
substances that contain hydrogen and potassium

If you go to a nutrition store and buy a supplement, you can count on the fact that it is pure and safe because supplements are regulated, controlled, and inspected by the fda.

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.

The substances that are necessary for producing of certain hormones and that store and transport vitamins