Traditional Culture Encyclopedia - Traditional stories - "Drum wave moon cake" inside a small paper bag, written on it "deoxidizer", its role is to remove the bag of oxygen, to achieve the purpose of food preservation. There are three

"Drum wave moon cake" inside a small paper bag, written on it "deoxidizer", its role is to remove the bag of oxygen, to achieve the purpose of food preservation. There are three

(1) A student's guess is a mixture of copper oxide and copper, according to the copper can not be dissolved in acid, and copper oxide can be dissolved in acid to produce a blue solution, so you can choose to dilute hydrochloric acid or dilute sulfuric acid to identify copper oxide, and then heat the red solid if, then it is copper, after heating the red solid will become black, so you can identify the two kinds of Substances;

(2) According to the three students' analysis and assumptions, we can know that the B students' conjecture is more reasonable, because iron can be in the humid air more easily and oxygen reaction, and the product of the reaction for the iron oxide, so the iron powder can be a better preservation of food, to extend the shelf life of the food.

The answer is: (1)

(2) B; ? Iron undergoes slow oxidation with water and oxygen to produce red iron trioxide (the main component of rust); 4Fe + 3O 2 ═2Fe 2 O 3 .

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