If you heard a new hurricane warning announced over the radio, what would it mean? A weak hurricane has been upgraded to a strong hurricane. A weak hurricane has been upgraded to a strong hurricane. A big hurricane is projected to hit land within 36 hours. A big hurricane is projected to hit land within 36 hours. A tropical storm at sea has been upgraded to a hurricane. A tropical storm at sea has been upgraded to a hurricane. A big hurricane is projected to hit land within 12 hours.

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 .