According to the law of conservation of matter, which statement about chemical reactions is true?

atoms cannot be created or destroyed by chemical reactions.

every atom destroyed in a chemical reaction must be replaced.

energy is created as atoms are destroyed in chemical reactions.

atoms are created by some reactions and destroyed by others.

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 .

To calculate the molarity of a solution, you need to know the moles of solute and the

Moving force of air flows from areas of high pressure to areas of low pressure true or false