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"Controlling the Speed of Iron Rusting" Changes in Matter PPT Courseware 4
Control the speed at which iron rusts
Key points of this lesson:
A. Water and air work together to make iron rust.
B. In daily life, the speed of iron rusting is closely related to the amount of water.
C. Isolating iron from water and air is a good way to prevent iron from rusting.
teaching objectives
1. Be able to correctly explain and remember how iron rusts;
2. Be able to correctly explain that in daily life, the speed of iron rusting is closely related to the content of substances in the air;
3. Can give 3-4 good ways to prevent iron from rusting;
4. Be able to explain the connection between material changes and human life;
5. Continue to learn the scientific inquiry method of "hypothesis-testing" to draw conclusions, and be able to design your own comparative experiments for verification.
scientific symposium
Research question: Is iron rust related to air?
Our hypothesis: The rust of iron is related to the air, because we found that the parts of the iron nails exposed to the air have rusted, but the parts nailed in the wooden boards have not rusted.
Experimental materials: 3 plates, 3 iron nails, water, vegetable oil
experimental method:
1. Use plates of the same size, fill two of them 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.
We saw:
Nails in empty dishes rust more slowly, nails in vegetable oil dishes are least likely to rust, and nails in water dishes are most likely to rust.
Results of the analysis:
(1) Iron rusting requires the combined action of water and air
(2) Iron rusts faster or slower in different environments
(3) Iron rusts quickly in salt water
(4) Color changes when iron rusts
Experimental results:
Iron rust is related to air and water, and iron rust is the result of water and air.
Cause Analysis:
Iron rusting requires the combined action of water and air. The speed of iron rusting varies in different environments. Iron rusts quickly in salt water, and the color of iron will change when it rusts.
choose
1. Factors affecting iron rust ( ).
A. Just air B. Just water C. It’s the combined effect of water and air
2. Which of the following places has iron windows that are prone to rusting? ( )
A. Dry desert B. Humid tropical seaside C. Dry plateau
3. The following methods can effectively prevent ironware from rusting ( ).
A. Apply paint B. Place in a dry place C. Wrap with wet cloth
D. Put it in the cellar E. Put it in water F. Completely submerge it in cooking oil
4. Which of the following scissors self-descriptions is a chemical change ( ).
A. It will become sharper after being sharpened. B. It can cut all kinds of clothing.
C. I have a beautiful appearance. D. I am afraid of humid air. I will be even worse looking there.
5. Put an iron nail in the beaker so that half of it is below the liquid level and half is above the liquid level, and then placed in the air. The part of the iron nail that is most likely to rust is ( ).
A. Iron nails under the liquid surface B. Iron nails in the air C. Iron nails at the junction of the liquid surface and the air D. All the above
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For more information about the PPT courseware "Changes in Substances Control the Speed of Iron Rusting", please click the Changes in Substances ppt Controls the Speed of Iron Rusting ppt tag.
"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...