Phenobarbital has a pka = 7.4. Compared to a 1.0 x 10^-3 M solution, 1.0 x 2 10^-4 M phenobarbital will have a (higher, lower) pH and a _(higher, lower) percent ionization. *​

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .

Which substance can be broken down by chemical means