Which of the following are molecules? Which of them are both molecules and compounds? oxygen (O2), carbon dioxide (CO2), sulfuric acid (H2SO4), ozone (O3), nitrogen (N2)
Hydrogen (H2), salt (NaCl), vinegar (C2H4O2), ammonia (NH3), baking soda (NaHCO3), methane (CH4)

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".