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"Controlling the Speed of Iron Rusting" Changes in Matter PPT Courseware 3
In the last class, we have studied the causes of iron rust and conducted comparative experiments. Now let us share the research results!
Research question: Is iron rust related to air?
Our hypothesis: Iron rusting is related to air. Because we found that the part of the iron nail exposed to the air had rusted, but the part nailed to the wooden board was not rusty.
Experimental materials: 3 plates, 3 nails, water, vegetable oil
Experimental method: 1. Use plates of the same size, two of which are filled with water and vegetable oil respectively.
2. Place one iron nail in an empty plate in contact with the air, another iron nail completely immersed in vegetable oil, and another iron nail half placed in water.
3. Observe and record once a day.
Experimental results: Iron rusting is related to the combined action of air and water.
Cause analysis: The air contains water vapor and oxygen is dissolved in the water.
Pay attention to two phenomena in daily life
(1) What will happen after a few days when a small amount of water is left in an iron pot?
(2) Will the iron railings rust after being painted?
Ask a question
Under what conditions does iron rust?
make a guess
1. It rusts in the presence of water.
2. It rusts in the presence of air.
3. Rust occurs in the presence of water and air at the same time.
Other rust prevention methods
1. Improve the nature of metal: For example, adding nickel and chromium to iron products to make stainless steel can prevent rust.
2. Electrochemical protection method: Use other metals to be fixed on iron products to form a corrosion battery, causing other metals to be corroded and thereby protecting the iron products. This method is often used to protect the shell of seagoing ships and large ship locks.
3. Improve the corrosive environment: reduce the concentration of corrosive media, avoid contact with acidic substances such as acid rain; remove oxygen from the media; control environmental temperature and humidity, etc. can effectively prevent rust.
Exercise and Practice
1. Could you please compare the iron products in Hainan Island and Turfan, which one is more likely to be corroded? Why?
2. Could you please tell me how to deal with washed iron pots and iron kitchen knives?
3. Please tell me what methods are used to prevent rust in different components of the bicycle.
4. How do you maintain the bicycle you ride on a rainy day and why?
Wipe with a dry cloth first (to keep the surface of the bicycle clean and dry)
Then wipe it with an oil cloth (to form a protective film on the surface of the bicycle)
Knowledge review
What did we learn in this lesson today?
What inspirations and thoughts does it give us?
After class exploration
Please design an experimental plan to explore the conditions for copper to rust. [Tip: The main component of patina is basic copper carbonate Cu2(OH)2CO3. 〕
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"Controlling the Speed of Iron Rusting" PPT teaching courseware on changes in matter:
"Controlling the Speed of Iron Rusting" PPT teaching courseware on changes in matter Part one: Exploration: Is iron rusting related to air? Experimental conclusion: Iron rusting is the result of the combined action of water and air. What does the speed of iron rusting depend on? The speed of iron rusting and the speed of water...
"Controlling the Speed of Iron Rusting" PPT download of changes in matter:
"Controlling the Speed of Iron Rusting" Changes in Matter PPT Download Part One Content: Exploring New Knowledge Scientific Forum In the section "Iron rusts", we hypothesize that iron rusting is related to water and air, and design comparative experiments to verify it. , in this lesson we will discuss the experimental results..
"Controlling the Speed of Iron Rusting" Changes in Matter PPT:
"Controlling the Speed of Iron Rusting" Material Changes PPT Part One Content: Scientific Discussion We studied the causes of iron rusting and conducted comparative experiments. Let us share the research results! Research question: Is iron rust related to air? Our hypothesis: Iron...