9. Given the following grilled cheese recipe, how many total complete grilled cheese sandwiches can be made if you have 20 slices of bread and 20 slices of cheese in your kitchen?
1 slice of cheese + 2 slices bread + 1 grilled cheese
a. 10 grilled cheeses
b. 20 grilled cheeses
C. 40 grilled cheeses
d. 80 grilled cheeses
e. None of the above.

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 .