Which of the following is an example of facilitated diffusion?

A-Sugar is transported into the cell via an energy-consuming process

B-Carbon dioxide exits the cell, passing directly through the cell membrane

C-Water moves out of the cell, passing through channel proteins in the cell membrane

D-Hydrogen ions are pumped out of the cell against their concentration gradient

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 .