There is a small paper bag in the mooncake box of a certain brand, which says "deoxidizer". Its function is to remove oxygen from the bag and achieve the purpose of preserving food. There are three pe

There is a small paper bag in the mooncake box of a certain brand, which says "deoxidizer". Its function is to remove oxygen from the bag and achieve the purpose of preserving food. There are three people.

(2)b； ? Iron powder is slowly oxidized by water and oxygen to generate iron oxide;

Special topic: Identification of substances.

Analysis: desiccant or deoxidizer is often put in the bag of food packaging. The desiccant is generally quicklime, and the deoxidizer is generally iron powder. When iron coexists with water and oxygen, it is easy to produce red rust. The test of iron and iron oxide involved in the topic is actually based on its properties. Iron can be attracted by magnets but iron oxide can't. Iron oxide can react with hydrochloric acid and dissolve.

(1) Iron can be attracted by magnets, but iron oxide cannot be attracted by magnets. Iron oxide can react with acid and dissolve. So the answer to this question is:

(2) Compared with copper, the chemical properties of iron are more active and easy to rust, that is, oxygen and water are easy to react and rust, so the deoxidizer commonly used in food packaging is iron powder instead of copper powder, so the answer to this question is: b; Iron slowly oxidizes with water and oxygen to generate iron oxide;

Comments: The use of desiccant and deoxidizer is determined by the nature of the substance. The deoxidizer investigated in this topic is iron that rusts easily when it meets water and oxygen, and the knowledge that can be extended is the application of desiccant, that is, the knowledge about quicklime.