"Iron rusts" PPT

Description

"Iron rusts" PPT

Part One: Observing Rust

The new bicycle I bought is not rusty. After using it for a period of time, some parts will become rusty.

In life, we often see some iron products rusting

What kind of change does iron rust cause?

Observe rust

Observe and compare iron sheets and rust. What are the differences between them?

Iron turns into rust. Is this a chemical change?

Part 2: Exploring the causes of iron rust

Why does iron rust?

What factors are related to iron rust?

Let's design an experiment to test our hypothesis.

Research question: Is iron rust related to air?

Our hypothesis: Iron rusting is related to air.

Experimental materials: 3 plates, 3 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.

Observed phenomena:

Experimental results:

Part 3: Conclusion

Iron rust is related to air and water.

Rust is most likely to occur where there is sufficient moisture and air;

It will not rust where there is no moisture and air.

Rust forms faster in clear water than in salt water.

When iron rusts, the rust will fall off.

Summarize

Iron rusting is a chemical change, and iron rust is a new substance different from iron.

Iron rust is related to water and air.

Part 4: Exercises

1. Fill in:

1. The color of the iron piece is ( ), and the color of the rust is ( ); the surface smoothness of the iron piece ( ) and the smoothness of the rust surface ( ); the iron piece is connected in the small light bulb circuit ( ) to conduct electricity, and the rust is connected to the small light bulb ( ) conducts electricity in a circuit. The iron piece ( ) is attracted by the magnet, and the rust ( ) is attracted by the magnet.

2. Isolating iron from ( ) and ( ) is a good way to prevent rust.

3. Iron ( ) can be prevented by painting, electroplating, making it into stainless steel, and keeping it dry.

4. Through experiments, we found that: ( ) and ( ) are the reasons why iron rusts easily.

5. Painting the iron will cut off the contact between the iron and ( ) to prevent the iron from rusting.

6. Place iron products such as kitchen knives in a dry place after use to cut off the contact between the iron and ( ), thereby preventing the iron products from rusting.

2. Choose one:

1. Iron rusting is ( ) change.

A.Chemistry B.Physics

2. Iron is more likely to rust in ( ) air.

A. Moist B. Dry

3. Iron nails placed in ( ) can prevent them from rusting.

A.Water B.Vegetable oil dish C.Salt water

4. Iron rusts faster than the reaction speed of baking soda and vinegar ( ).

A. Fast B. Slow C. As fast

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Update Time: 2024-11-25

This template belongs to science courseware Qingdao Edition Fifth Grade Science Volume 1 industry PPT template

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