"Metal" PPT courseware 2

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"Metal" PPT courseware 2

do you know?

Metal is a type of substance that we often see, so what metal names do you know?

Gold, silver, copper, iron, tin, zinc, lead, magnesium·······

Metals used earlier by humans

As early as four or five thousand years ago, the ancient Chinese knew how to use metal-bronze to make objects. Bronze vessels, bronze weapons, and bronze coins, mankind has entered the Bronze Age.

Common metals in life

Bronze is a metal material used by our ancestors. With the development of science and technology, more and more new metal materials have entered our lives.

Basic knowledge of aluminum

Aluminum is a light metal, and its compounds are widely distributed in nature. The content of aluminum in the earth's crust is about 8% (weight), ranking third after oxygen and silicon. Among metallic elements, it is the second largest group of metals after steel. Aluminum has special chemical and physical properties and is one of the most commonly used industrial metals today. It is not only light in weight and strong in texture, but also has good ductility, electrical conductivity, thermal conductivity, heat resistance and nuclear radiation resistance. It is a national Important basic raw materials for economic development.

Main uses of aluminum

Over the past fifty years, aluminum has become one of the most widely used metals in the world. In the construction industry, aluminum is widely used due to its stability in the air and excellent appearance after anodization; aluminum alloy materials are also widely used in the aviation and defense industry sectors; high-strength steel wires are commonly used in power transmission Reinforced aluminum cables; in addition, automobile manufacturing, container transportation, daily necessities, household appliances, mechanical equipment, etc. all require a large amount of aluminum.

Introduction to basic knowledge of iron

Iron is the most abundant and cheapest metal element on the earth. It is an indispensable basic material for almost all industries. Its products have a wide range of uses. Modern society would not exist without iron and steel, and people's livelihood cannot live without it.

The use of steel products can be seen everywhere, from refrigerators, kitchen utensils, washing machines at home, transportation vehicles, railways, trams, iron bridges, ships, transmission towers, residential buildings, factories, and machinery; steel products are made of iron Ore is refined and processed into products for various uses. The cutting products or used products are turned into scrap steel, which can be recycled and reused indefinitely.

Basic knowledge of copper

Copper is one of the earliest ancient metals discovered by humans. Humans began to use copper more than 3,000 years ago.

Metal copper, element symbol Cu, atomic weight 63.54, specific gravity 8.92, melting point 1083oC. Pure copper is light rose or light red in color. After a copper oxide film is formed on the surface, it appears copper-colored. Copper has many valuable physical and chemical properties, such as high thermal conductivity and electrical conductivity, strong chemical stability, high tensile strength, easy welding, corrosion resistance, plasticity, and ductility. Pure copper can be drawn into very fine copper wires and made into very thin copper foil. It can form alloys with zinc, tin, lead, manganese, cobalt, nickel, aluminum, iron and other metals.

Main uses of copper

Copper is a nonferrous metal that is closely related to human beings. It is widely used in electrical, light industry, machinery manufacturing, construction industry, defense industry and other fields. It is second only to aluminum in the consumption of nonferrous metal materials in my country.

Copper is the most widely used and consumed in the electrical and electronic industries, accounting for more than half of total consumption.

Common characteristics of metals

Metals can all conduct electricity.

Metal has good thermal conductivity.

Metal has a special luster.

Metal has good ductility.

ductility of metal

The ductility of metal means that the shape of the metal can change when it is subjected to external pressure. Ductility means that metal can be drawn into filaments. For example, the diameter of the thinnest platinum wire is only 1/5000mm. Metal is also ductile, which means it can be pressed into thin sheets. For example, the thinnest gold foil is only 1/10000mm thick. The most malleable metal is gold. It is reported that ① someone extended 28 grams of gold to a length of 65 kilometers; ② one tael of gold, pressed into gold foil, can cover two basketball courts.

This is how metal comes from:

1. From metal minerals, people mine and smelt metals, obtain metals, process them, and finally obtain metal items;

2. Smelt and process the recycled scrap metal items to obtain metal items.

Metal is a renewable material that can be recycled

The best of metal

The most abundant metal on earth - aluminum

The most abundant metal in the human body - calcium

The metal with the highest annual production in the world - iron

The metal with the best thermal conductivity - silver

The hardest metal - chromium

The metal with the highest melting point - tungsten

The metal with the lowest melting point - mercury

Summary and refinement

1. What did you gain from studying this class?

We know that metals have common properties such as luster, heat transfer, electrical conductivity, and ductility, and we also know where metals come from.

2. Where do people use metal?

Metals are used in industrial and agricultural production, national defense, aerospace, navigation, medical care, scientific research and daily life.

After-school extension

1. Prepare a collection bin at home or in the classroom to recycle scrap metal products and become a little environmental guardian.

2. Go home and investigate. Which utensils in daily life are made of the following metals, and which characteristics of metals are used?

aluminum silver copper iron

Feedback reinforces

1. Put a metal spoon into hot water. The metal spoon will heat up quickly, which means that the metal is easy to break ( ). Use a hammer to hit a nail. If the shape of the nail changes but does not break, it means that the metal is easy to break ( ).

2. Metal can be made into wires. What characteristics of metal are used?

Answer: This takes advantage of the fact that metal is easy to conduct electricity.

3. Aluminum can be processed into thin sheets. What characteristics of the metal are used?

Answer: This takes advantage of the ductility of metal.

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For more information about the "Metal" PPT courseware, please click the Metal ppt tab.

"End of Chapter Review Lesson" Iron Metal Materials PPT:

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"Integration Improvement at the End of Chapter" Iron Metal Material PPT:

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Update Time: 2024-11-19

This template belongs to science courseware E-education edition fifth grade science volume 2 industry PPT template

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