魔法化学九年级下 -（Magic chemistry, grade nine, next -）.docVIP

魔法化学九年级下 8-3（Magic chemistry, grade nine, next 8-3） All rights reserved and must not be copied Magic chemistry, grade nine, next 8-3 Topic 3 utilization and protection of metal resources Walking into the world of Chemistry Dear classmates, have you seen the movie Titanic? Remember the search in the cabin to look around the treasure that scene? We can see that the rust at the bottom of the Titanic has already become a pile of rust. In contrast, though the wheel not luxurious nor what treasures but, very complete, rust rarely. Since crossing round every day sailing on the river, long time to contact with water, then why rust is not common phenomenon? Titanic is completely rusted, because it is a long period with water and oxygen dissolved in water. As for the contact wheel because of it, the surface coated with a layer of paint, separating the water and air, so it is not easy to rust. Key points of interpretation 1. understanding common metals such as iron, copper, aluminum minerals - go and see their specimens in the laboratory 2. understand the method of iron making and steelmaking, and grasp the principle of iron making and steelmaking Ferroalloy smelting pig iron Raw materials: iron ore, coke, limestone, air Principle: under high temperature, the iron is reduced from the iron oxide by reducing agent carbon monoxide (IMG004 Equipment: blast furnace Product: pig iron Raw material: pig iron, scrap steel, oxygen, quicklime Principle: at high temperature, the excess carbon and other impurities in pig iron are converted to gas or slag by oxygen or iron oxides steel Equipment: converter, open hearth furnace. Product: Steel - take a tour of a nearby iron works under the guidance of a teacher or an acquaintance, and listen to the engineers explanation 3. necessary conditions for rust Iron is also in contact with water or steam and oxygen. If it is isolated from air and water, it can prevent rusting of steel to a certain extent Do you know any anti rust methods? (1) the cor