"Cherish and Protect Metal Resources" Metal PPT Courseware 2

Description

"Cherish and Protect Metal Resources" Metal PPT Courseware 2

learning target

1. Know that metal resources on the earth are limited, and pay attention to the consumption of metal resources.

2. Understand the conditions for rust generation.

3. Understand several simple methods of rust prevention.

1. Our metal resources

[Material 1] Human beings require a large amount of metal mineral resources from nature every year to extract hundreds of millions of tons of metals. Metal minerals have limited reserves and are not renewable. Based on the proven reserves of some minerals and the current consumption rate of these metals, some people estimate that the number of years some minerals can be mined is as shown in the figure below (excluding newly proven mineral reserves in the future and metal reserves in some countries) and metal recycling, etc.).

[Information 2] The world's metal equipment and materials scrapped due to corrosion every year is equivalent to 20% to 40% of annual production.

2. Explore the causes of steel corrosion

1. Ask questions:

What are the factors that cause steel to rust?

2. Conjectures and Assumptions

Iron rust is related to oxygen and moisture

3. Experiments and facts

(1) Design experiments

(2) Conduct experiments

(3) Record experimental phenomena

3. Metal protection

The main method of preventing rust is to use a protective layer to isolate the metal from air and moisture.

(1) Add paint, oil or enamel

(2) Plated with other metals, such as tin or chromium, etc.

In addition to taking measures to prevent metal corrosion, what other ways can be used to protect metal resources?

Small scale chopper

1. Among the following situations, iron nails are most likely to rust: ( )

A.In humid air B.In dry air

C. Submerged in vegetable oil D. Sealed in vacuum bag

2. Which of the following statements about iron wire burning in oxygen or iron wire rusting is correct ( )

A. Burning iron wire produces white smoke B. Iron wire rusts due to slow oxidation

C. The product of burning iron wire is Fe2O3 D. The main component of rust is Fe3O4

3. Under the following circumstances, the order of severity of rust spots on kitchen knives from heavy to light is ________

(1) Cut wet pickles and place them (2) Cut sauerkraut and place them

(3) Wash and dry the vegetables after cutting. (4) Rinse with water after cutting the vegetables.

(5) After cutting the vegetables, wash and dry them, and then apply a little peanut oil

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For more information about the PPT courseware "Metal Cherishing and Protecting Metal Resources", please click the Metal ppt Cherishing and Protecting Metal Resources ppt tab.

"Cherish and Protect Metal Resources" Metal PPT Courseware 4:

"Cherish and Protect Metal Resources" Metal PPT Courseware 4 1. Consumption of Metal Resources Information 1: Human beings require a large amount of metal mineral resources from nature every year to extract hundreds of millions of tons of metals. Metal minerals have limited reserves and are not renewable. According to the research...

"Cherish and Protect Metal Resources" Metal PPT Courseware 3:

"Cherish and Protect Metal Resources" Metal PPT Courseware 3 Consumption of Metal Resources Ask the question: Why does steel rust? Conjectures and assumptions: Chains and steel rings rust because of rain, carports and gates rust because they are exposed to the air for a long time, cars in factories...

"Cherish and Protect Metal Resources" Metal PPT courseware:

"Cherish and Protect Metal Resources" Metal PPT Courseware Why should we protect metal resources? Reasons for protecting metal resources: ⑴ A large amount of mining occurs every year (billions of tons) ⑵ A large amount of metal is corroded every year (equivalent to 20% to 40% of annual production) 1. Metal corrosion and protection...

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Update Time: 2024-07-01

This template belongs to Chemistry courseware Cantonese Education Edition Ninth Grade Chemistry Volume 2 industry PPT template

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