What needs to happen for the equation ch4 + o2 → co2 + h2o to be balanced? a. nothing, the equation is already balanced. b. a coefficient of 2 must be added before both products and reactants. c. a coefficient of 2 must be added before the second reactant and the second product. d. a coefficient of 2 must be added before both products.

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 .