"Cherish and Protect Metal Resources" Metal PPT Courseware 3

Description

"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 doors rust because they are exposed to the air for a long time; lathes and machines in factories rust because they are exposed to chemicals

think about it

Answer the following questions:

1. Why is boiled distilled water used in test tube 3?

2. The aluminum oxide generated by the reaction of aluminum and oxygen can protect the inner layer of aluminum. Can rust also protect the iron underneath?

3. Can you propose a principle to prevent iron products from rusting based on the conditions under which iron rusts?

Explanation and conclusion:

Iron can corrode in an environment where water and oxygen exist simultaneously

Iron is more likely to rust in the presence of acids and salts

Rust is a loose and porous substance whose main component is Fe2O3 (reddish brown)

2. Metal protection

discuss

What anti-rust measures have been taken for bicycle components such as brackets, chains, steel rings, etc.?

Answer: Painting, oiling, chrome plating, etc.

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

Why do scrap collection stations purchase metals such as scrap iron, scrap copper, and cans?

What is the significance of scrap metal recycling?

Can save metal resources

Since metal smelting takes place at high temperatures, recycling and reusing scrap metal can save energy.

Reduce the production cost of metal products, making it easier for people to obtain high-quality and low-price metal products

Can reduce metal pollution to the environment

Metal protection summary:

1. From the perspective of resource extraction and development

a. Planned and reasonable exploitation of resources

b. Actively carry out research and development of metal substitutes and use plastics with special properties to replace metal materials.

c. Strengthen the recycling and reuse of scrap metal

2. From the perspective of protecting metal materials and products

The specific methods to prevent iron products from rusting are:

Keep iron surfaces dry and clean

Use a protective layer to isolate the metal from air and moisture, such as painting, oiling, enamel firing, plating with a layer of wear-resistant and corrosion-resistant metal chromium, burning the metal at high temperature, and performing "baking" treatment, etc.

Made into alloy steel such as stainless steel

Plated with corrosion-resistant metals such as zinc, copper, nickel and chromium.

I will do it

1. Answer through experiments. In which of the following situations do iron nails tend to rust?

(1) In dry air

(2) In humid air

(3) Partially immersed in salt water

(4) Soak in vegetable oil

2. The following methods can prevent iron products from rusting ( )

A. If the bicycle is dirty, rinse it with clean water.

B. Use waste acid to flush iron sewage pipes

C. Apply a layer of paint to the iron basketball stand

D. After cutting the pickles, wash and dry the kitchen knife as soon as possible

3. With the improvement of people's quality of life, the use of various batteries has increased significantly, and the issue of centralized treatment of waste batteries has been put on the agenda. The primary reason is ( )

A Recycling of metal materials from battery casings

B Prevent the pollution of soil and water sources by heavy metals such as mercury, cadmium, and lead in batteries

C Reduce the corrosion of other items caused by leaking liquid in the battery

D Recycling graphite electrodes in batteries

Keywords: metal teaching courseware, cherishing and protecting metal resources teaching courseware, Guangdong Education Edition ninth grade chemistry PPT courseware download, second volume, ninth grade chemistry slide courseware download, metal PPT courseware download, cherishing and protecting metal resources PPT courseware download,. PPT format;

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 2:

"Cherish and Protect Metal Resources" Metal PPT Courseware 2 Learning Objectives 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...

"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...

File Info

Update Time: 2024-10-20

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

Preview