"Common Metal Materials" Chemistry in Seawater PPT

Description

"Common Metal Materials" Chemistry in Seawater PPT, 23 pages in total.

learning target

1. Understand the physical properties of common metals and understand the important role of metal materials in daily life and agricultural production;

2. Know the definition of alloy, and based on this, initially establish the chemical concept that "mixing" can change the properties of substances;

3. Understand the important iron ore and the basic principles of industrial iron and aluminum smelting.

1. Physical properties of metals

Chemistry around us - metal products

The properties of matter determine the uses of materials to a large extent. Based on the picture below, can you tell the uses of metals?

Summary of physical properties of metals:

1. Has a metallic luster; most metals are silver-white (copper is purple-red, gold is yellow);

2. At normal temperatures, most metals are solid (mercury is liquid);

3． Most metals are good conductors of electricity and heat;

4． Has good ductility;

5. Most metals are denser and have higher melting points.

2. Alloy

Alloy: A substance with metallic characteristics formed by heating and fusing certain metals or non-metals into metals.

For example:

Pig iron mainly contains: iron, carbon, carbon content 2%-4.3%

Steel mainly contains: iron, carbon, carbon content 0.03%-2%

Activity world:

(1) Compare the gloss and color of brass sheets and copper sheets, duralumin sheets and aluminum sheets; score them against each other and compare their hardness

(2) Experiment: Place the tin sheet and solder on the iron sheet, heat the center part of the iron sheet, and observe how easy it is to melt.

Experimental phenomenon: solder melts first

Conclusion: The melting points of alloys are generally lower than the melting points of the pure metals of which they are composed.

Knowledge training

1. The metal material used to make wires is generally ( )

A.Iron B.Copper C.Silver D.Magnesium

2. Two substances in each of the following groups are mixtures ( )

A.Steel, stainless steel B.Copper, bronze

C.Iron, pig iron D.Tin, solder

3. Which of the following statements about alloys is correct ( )

A.The alloy lacks metallic luster

B. There are only more than 90 types of alloys

C. Alloys are compounds

D. Many properties of alloys are superior to those of pure metals

Keywords: free download of PPT courseware for the ninth grade of the May 4th Lujiao version of chemistry, common metal materials PPT download, chemistry in seawater PPT download, .PPT format;

For more information about the "Chemistry of Seawater Common Metal Materials" PPT courseware, please click the Chemistry of Seawater PPT Common Metal Materials PPT tab.

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Update Time: 2024-10-01

This template belongs to Chemistry courseware Lu Jiao Edition Ninth Grade Chemistry Volume 2 industry PPT template

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