Rank the following coffee samples in terms of likely sweetness based on the amount of sugar added. Use 1 to indicate the sweetest coffee and 4 for the least-sweet coffee.

5 g of sugar added to 50 g of coffee
5 g of sugar added to 100 g of coffee
2 g of sugar added to 100 g of coffee
2 g of sugar added to 50 g of coffee

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 .